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Thesis is a thoroughbred horse born in Ireland in 1998. Race horse Thesis is by Definite Article (GB) out of Chouette (GB) , trained by Miss Venetia Williams. Thesis form is available here. Owned by THE 1961 PARTNERSHIP.

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THESIS is a bay horse. He is 5 years old (foaled 02 May 2019). The owner of THESIS is Juddmonte and his current trainer is Harry & Roger Charlton. The pedigree for THESIS is: KINGMAN - NIMBLE THIMBLE (USA) - MIZZEN MAST (USA).

THESIS last ran at Ascot on 16 June 2022, in the BRITANNIA STAKES (HERITAGE HANDICAP) (2) over a distance of 1M. Ridden by Ryan Moore, THESIS finished 1st of 30 runners. The Industry Starting Price (ISP) for THESIS was 14/1 (Betfair SP 17.77).

THESIS currently has no future entries.

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Expert Commentary

‘Horse race’ reporting of elections can harm voters, candidates, news outlets: What the research says

Our updated roundup of research looks at the consequences of one of the most common ways journalists cover elections — with a focus on who’s in the lead and who’s behind instead of policy issues.

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This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License .

by Denise-Marie Ordway, The Journalist's Resource October 23, 2023

This <a target="_blank" href="https://journalistsresource.org/politics-and-government/horse-race-reporting-election/">article</a> first appeared on <a target="_blank" href="https://journalistsresource.org">The Journalist's Resource</a> and is republished here under a Creative Commons license.<img src="https://journalistsresource.org/wp-content/uploads/2020/11/cropped-jr-favicon-150x150.png" style="width:1em;height:1em;margin-left:10px;">

This collection of research on horse race reporting, originally published in September 2019 and periodically updated, was last updated on Oct. 23, 2023 with recent research on third-party political candidates, probabilistic forecasting and TV news coverage of the 2020 presidential election.

When journalists covering elections focus primarily on who’s winning or losing instead of policy issues –what’s known as horse race coverage — voters, candidates and the news industry itself suffer, a growing body of research suggests.

Media scholars have studied horse race reporting for decades to better understand the impact of news stories that frame elections as a competitive game, relying heavily on public opinion polls and giving the most positive attention to frontrunners and underdogs who are gaining support. It’s a common strategy for political news coverage in the U.S. and other parts of the globe.

Thomas E. Patterson , professor of government and the press at the Harvard Kennedy School of Government, says U.S. election coverage often does not delve into policy issues and candidates’ stances on them. In fact, policy issues accounted for 10% of news coverage about the 2016 presidential election that Patterson examines in his December 2016 working paper, “ News Coverage of the 2016 General Election: How the Press Failed the Voters .” The bulk of the reporting concentrated on who was winning and losing and why.

When he looked at how CBS and Fox News covered the 2020 presidential election in their evening newscasts, he found similar patterns. For example, three-fourths of the stories the CBS Evening News ran on Democratic candidate Joe Biden focused on the horse race, as did a third of its stories about Republican candidate Donald Trump, Patterson writes in his December 2020 working paper, “ A Tale of Two Elections: CBS and Fox News’ Portrayal of the 2020 Presidential Campaign .”

In both papers, Patterson notes this type of reporting can help some candidates while hurting others.

“[These reports] tend to be a source of positive news for the candidate who’s ahead in the race, except when that candidate is slipping in the polls,” he writes in his 2020 analysis. “Speculation about the reasons for the decline then drive the story, and there’s nothing positive about that narrative.”

Dozens of academic studies chronicle the dangers of horse race journalism. Scholars find it’s associated with:

• Distrust in politicians.
• Distrust of news outlets.
• An uninformed electorate.
• Inaccurate reporting of opinion poll data.

Studies also indicate horse race reporting can:

• Shortchange female candidates, who tend to focus on policy issues to build their credibility.
• Give novel or unusual candidates an edge.
• Hurt third-party candidates, who often are overlooked or ignored by newsrooms because their chances of winning are usually quite slim compared with Republican and Democratic candidates.

In recent years, scholars have begun investigating the impact of a relatively new type of horse race journalism: probabilistic forecasting . Some newsrooms have the resources and expertise to conduct sophisticated analyses of data collected from multiple opinion polls to more precisely predict candidates’ chances of winning. This allows news outlets to present polling data as the percentage likelihood that one candidate will win over another candidate.

The research to date indicates probabilistic forecasting can confuse voters and possibly lead them to believe an election outcome is more certain than it actually is. Researchers worry that will affect voter turnout — when people doubt their votes will make a difference, many might not bother turning in a ballot.

Part of the problem is some voters misinterpret probabilistic forecasting, researchers explain in a January 2023 study in the journal Judgment and Decision Making. They don’t understand the difference between a candidate’s probability of winning and their predicted vote share.

“A vote share of 60% is a landslide win, but a win probability of 60% corresponds to an essentially tied election,” write the researchers, led by Andrew Gelman , a professor of statistics and political science at Columbia University.

Research to help journalists understand the pitfalls of horse race reporting

Journalists wanting to know more about the consequences of horse race reporting, keep reading. Below, we’ve gathered and summarized academic studies that examine the topic from various angles. For additional context, we included several studies that look at how journalists use — and sometimes misuse — opinion polls. We’ll update this roundup of research periodically, as new studies are released.

If you need help reporting on polls, please read our tip sheet on questions journalists should ask when covering them and our tip sheet on interpreting margins of error .

Also, because it’s unlikely newsrooms will stop covering elections as a competitive game, we created a tip sheet to help them improve. Check out “‘ Horse Race’ Coverage of Elections: What to Avoid and How to Get It Right .”

The consequences of horse race reporting

The Polls and the U.S. Presidential Election in 2020 … and 2024 Arnold Barnett and Arnaud Sarfati.Statistics and Public Policy, May 2023.

This study looks at how accurately FiveThirtyEight , which aggregates opinion polls and publishes news stories about the results, predicted the outcomes of America’s 2020 presidential election. The authors find it “did an excellent job” predicting who would win in each state but underestimated Donald Trump’s vote share by state by a “modest” amount.

Once a standalone news site, FiveThirtyEight, which recently became 538, was incorporated into ABC News’ website after the news organization acquired it in 2018.

The authors note it’s important to gauge how accurately predictions were made because voters’ perceptions of how polls performed in the most recent presidential election can have consequences for the next one. The accuracy of 2024 presidential polls “is already a live issue at the start of 2023,” write the authors, Arnold Barnett , a professor of management science and statistics at the MIT Sloan School of Management, and Arnaud Sarfati , a graduate student at MIT at the time the paper was written.

“If such polls — as distilled by a respected aggregator like FiveThirtyEight — are viewed as trustworthy, they could affect the intensity of pressure on Joe Biden to retire,” Barnett and Sarfati write. “They could influence Republican voters in state primaries who wonder whether Donald Trump could plausibly win reelection. The potential candidacies of Democrats like Amy Klobuchar or Republicans like Ron DeSantis could rise or fall with their standings in voter surveys.”

The analysis finds FiveThirtyEight underestimated Trump’s vote share in each state by an average of 1.90 percentage points. Trump outperformed FiveThirtyEight’s estimates in both heavily Democratic states and heavily Republican states.

Barnett and Sarfati write that “it is concerning that, for the second election in a row, the polls underestimated the support for Donald Trump and FiveThirtyEight did not devise an appropriate adjustment for the downward bias.”

A possible reason for the shortfall, according to the authors: Trump supporters might have been more likely to refuse to participate in voter surveys than Trump opponents. 

“While one hopes that lessons from 2020 will avoid the problem in 2024, there is no certainty that this will be the case,” Barnett and Sarfati write.

Information, Incentives, and Goals in Election Forecasts Andrew Gelman, Jessica Hullman, Christopher Wlezien and George Elliott Morris. Judgment and Decision Making, January 2023.

In this paper, scholars offer a highly technical analysis of probabilistic forecasts of elections in the U.S. and how they are communicated to the public. They also make recommendations aimed at helping the public understand how these forecasts are made and how results should be interpreted.

The scholars point out that “forecasters have some responsibility to take into account what readers may do with a visualization or statement of forecast predictions.” They suggest researchers and news outlets work together to figure out the best ways to present this information to the public.

“Designing a forecast without any thought to how it may play into readers’ decisions seems both impractical and potentially unethical,” write the four researchers: Gelman, of Columbia University; Jessica Hullman , an associate professor of computer science at Northwestern University; Christopher Wlezien , a professor of government at the University of Texas at Austin; and George Elliott Morris , the editorial director of data analytics at ABC News.

“In general, we think that more collaboration between researchers invested in empirical questions around uncertainty communication and journalists developing forecast models and their displays would be valuable,” they add.

The authors suggest researchers and journalists work together to improve election predictions and news outlets’ methods of communicating results. If that information is well presented and explained, the public’s ability to interpret forecasts correctly could develop over time, they write.

“Naturally, adding too much information risks overwhelming readers,” they add. “The majority spend only a few minutes on the websites, and may feel overwhelmed by concepts such as correlation that forecasters will view as both simple and important, but are largely beside the point of the overall narrative of the forecast. Still, increasing readers’ literacy about model assumptions could happen in baby steps: a reference to a model assumption in an explanatory annotation on a high level graph, or a few bullets at the top of a forecast display describing information sources to whet a reader’s appetite.”

Third-Party Candidates, Newspaper Editorials, and Political Debates John F. Kirch. Newspaper Research Journal, May 2022.

News outlets exclude or limit coverage of third-party political candidates, even when those candidates are legitimate contenders, suggests this analysis of editorials in the Washington Post and 12 other newspapers that report on Virginia politics.

When Towson University journalism professor John Kirch looked at how these newspapers’ editorial staff characterized candidates in the 2013 gubernatorial race in Virginia, he discovered they often excluded Libertarian candidate Robert Sarvis. He was mentioned in 28.8% of all editorials that ran between Sept. 4, 2013 and Nov. 6, 2013. The Republican candidate, Ken Cuccinelli, appeared in 91.9% of editorials and the Democratic candidate, Terry McAuliffe, appeared in 73.9%.

The Washington Post did not mention Sarvis at all during that period.

Kirch writes that Virginia’s 2013 gubernatorial campaign makes for a good case study because Sarvis was a candidate with strong academic and professional credentials who had run as a Republican for a state senate seat in 2011.

“He ran against two highly unpopular major-party candidates, whose approval ratings were below 50% for most of the campaign,” Kirch writes. “And Sarvis was a serious candidate, which is defined in this study as one who received at least 5% support in the polls, the threshold used by the federal government to determine whether a candidate is eligible for public financing. If ever there was a gubernatorial campaign in which newspaper editorials would consider endorsing or advocating for a third-party candidate’s inclusion in debates, it is the Virginia race.”

When the newspapers’ editorials did mention Sarvis, they sometimes labeled him as a long shot, a spoiler or a protest vote rather than a serious competitor. They never mentioned his education or career as an economist, mathematician or businessman. Meanwhile, the Democratic candidate was identified as the former head of the Democratic Party in 25.6% of the editorials in which he appeared and identified by his occupation as a businessman in 18.3%. The Republican candidate was described as the state’s attorney general in 55.9% of the editorials in which he appeared.

However, one of the 13 newspapers examined endorsed Sarvis for governor — the Register & Bee in Danville, Virgina. Four others advocated for him to be included in the gubernatorial debates while the editorials of nine newspapers ignored his exclusion from the debates.

Kirch blames horse race coverage as “a factor in why minor parties are ignored, with scholarship showing that third-party candidates are left on the sidelines because they rarely meet the metrics the news media use to measure the contest aspects of a campaign, such as fundraising abilities and poll support.”

Projecting Confidence: How the Probabilistic Horse Race Confuses and Demobilizes the Public Sean Jeremy Westwood, Solomon Messing and Yphtach Lelkes. The Journal of Politics, 2020.

This paper examines problems associated with probabilistic forecasting — a type of horse race journalism that has grown more common in recent years. These forecasts “aggregate polling data into a concise probability of winning, providing far more conclusive information about the state of a race,” write authors Sean Jeremy Westwood , an associate professor of government at Dartmouth College, Solomon Messing , a senior engineering manager at Twitter, and Yphtach Lelkes , an associate professor of communication at the University of Pennsylvania.

The researchers find that probabilistic forecasting discourages voting, likely because people often decide to skip voting when their candidate has a very high chance of winning or losing. They also learned this type of horse race reporting is more prominent in news outlets with left-leaning audiences, including FiveThirtyEight, The New York Times and HuffPost.

Westwood, Messing and Lelkes point out that probabilistic forecasting might have contributed to Clinton’s loss of the 2016 presidential election. They write that “forecasts reported win probabilities between 70% and 99%, giving Clinton an advantage ranging from 20% to 49% beyond 50:50 odds. Clinton ultimately lost by 0.7% in Pennsylvania, 0.2% in Michigan, 0.8% in Wisconsin, and 1.2% in Florida.”

The Consequences of Strategic News Coverage for Democracy: A Meta-Analysis Alon Zoizner. Communication Research, 2021.

This paper examines what was known about the consequences of horse race journalism at the time it was written. Although the paper first appeared on the Communication Research journal’s website in 2018, it wasn’t published in an issue of the journal until 2021. In the academic article, Alon Zoizner , an assistant professor of communication at the University of Haifa, Israel, analyzes 32 studies published or released from 1997 to 2016 that examine the effects of “strategic news” coverage. He describes strategic news coverage as the “coverage of politics [that] often focuses on politicians’ strategies and tactics as well as their campaign performance and position at the polls.”

Among the key takeaways: This type of reporting elevates the public’s cynicism toward politics and the issues featured as part of that coverage.

“In other words,” Zoizner writes, “this coverage leads to a specific public perception of politics that is dominated by a focus on political actors’ motivations for gaining power rather than their substantive concerns for the common good.”

He adds that young people, in particular, are susceptible to the effects of strategic news coverage because they have limited experience with the democratic process. They “may develop deep feelings of mistrust toward political elites, which will persist throughout their adult lives,” Zoizner writes.

His analysis also reveals that this kind of reporting results in an uninformed electorate. The public receives less information about public policies and candidates’ positions on important issues.

“This finding erodes the media’s informative value because journalists cultivate a specific knowledge about politics that fosters political alienation rather than helping citizens make rational decisions based on substantive information,” the author writes. Framing politics as a game to be won “inhibits the development of an informed citizenship because the public is mostly familiar with the political rivalries instead of actually knowing what the substantive debate is about.”

Another important discovery: Strategic news coverage hurts news outlets’ reputations. People exposed to it “are more critical of news stories and consider them to be less credible, interesting, and of low quality,” Zoizner explains. “Strategic coverage will continue to be a part of the news diet but in parallel will lead citizens to develop higher levels of cynicism and criticism not only toward politicians but also toward the media.”

News Coverage of the 2016 Presidential Primaries: Horse Race Reporting Has Consequences Thomas E. Patterson. Harvard Kennedy School working paper, 2016.

Horse race reporting gave Donald Trump an advantage during the 2016 presidential primary season, this working paper finds. Nearly 60% of the election news analyzed during this period characterized the election as a competitive game, with Trump receiving the most coverage of any candidate seeking the Republican nomination. In the final five weeks of the primary campaign, the press gave him more coverage than Democratic frontrunners Hillary Clinton and Bernie Sanders.

“The media’s obsession with Trump during the primaries meant that the Republican race was afforded far more coverage than the Democratic race, even though it lasted five weeks longer,” writes Patterson , who looked at election news coverage provided by eight major print and broadcast outlets over the first five months of 2016. “The Republican contest got 63 percent of the total coverage between January 1 and June 7, compared with the Democrats’ 37 percent — a margin of more than three to two.”

Patterson’s paper takes a detailed look at the proportion and tone of coverage for Republican and Democratic candidates during each stage of the primary campaign. He notes that the structure of the nominating process lends itself to horse race reporting. “Tasked with covering fifty contests crammed into the space of several months,” he writes, “journalists are unable to take their eyes or minds off the horse race or to resist the temptation to build their narratives around the candidates’ position in the race.”

Patterson explains how horse race journalism affects candidates’ images and can influence voter decisions. “The press’s attention to early winners, and its tendency to afford them more positive coverage than their competitors, is not designed to boost their chances, but that’s a predictable effect,” he writes. He points out that a candidate who’s performing well usually is portrayed positively while one who isn’t doing as well “has his or her weakest features put before the public.”

Patterson asserts that primary election coverage is “the inverse of what would work best for voters.” “Most voters don’t truly engage the campaign until the primary election stage,” he writes. “As a result, they enter the campaign nearly at the point of decision, unarmed with anything approaching a clear understanding of their choices. They are greeted by news coverage that’s long on the horse race and short on substance … It’s not until later in the process, when the race is nearly settled, that substance comes more fully into the mix.”

What Predicts the Game Frame? Media Ownership, Electoral Context, and Campaign News Johanna Dunaway and Regina G. Lawrence. Political Communication, 2015.

Corporate-owned and large-chain newspapers were more likely to publish stories that frame elections as a competitive game than newspapers with a single owner, according to this study. The authors find that horse race coverage was most prevalent in close races and during the weeks leading up to an election.

Researchers Johanna Dunaway , an associate professor of communication at Texas A&M University, and Regina G. Lawrence , associate dean of the University of Oregon School of Journalism and Communication in Portland, looked at print news stories about elections for governor and U.S. Senate in 2004, 2006 and 2008. They analyzed 10,784 articles published by 259 newspapers between Sept. 1 and Election Day of those years.

Their examination reveals that privately-owned, large-chain publications behave similarly to publications controlled by shareholders. “We expected public shareholder-controlled news organizations to be most likely to resort to game-framed news because of their tendency to emphasize the profit motive over other goals; in fact, privately owned large chains are slightly more likely to use the game frame in their campaign news coverage at mean levels of electoral competition,” Dunaway and Lawrence write.

They note that regardless of a news outlet’s ownership structure, journalists and audiences are drawn to the horse race in close races. “Given a close race, newspapers of many types will tend to converge on a game-framed election narrative and, by extension, stories focusing on who’s up/who’s down will crowd out stories about the policy issues they are presumably being elected to address,” the authors write. “And, as the days-’til-election variable shows, this pattern will intensify across the course of a close race.”

Gender Bias and Mainstream Media Meredith Conroy. Chapter in the book Masculinity, Media, and the American Presidency, 2015.

In this book chapter, Meredith Conroy , an associate professor of political science at California State University, San Bernardino, draws on earlier research that finds horse race coverage is more detrimental to women than men running for elected office. She explains that female candidates often emphasize their issue positions as a campaign strategy to bolster their credibility.

“If the election coverage neglects the issues, women may miss out on the opportunity to assuage fears about their perceived incompetency,” she writes. She adds that when the news “neglects substantive coverage, the focus turns to a focus on personality and appearance.”

“An overemphasis on personality and appearance is detrimental to women, as it further delegitimizes their place in the political realm, more so than for men, whose negative traits are still often masculine and thus still relevant to politics,” she writes.

Contagious Media Effects: How Media Use and Exposure to Game-Framed News Influence Media Trust David Nicolas Hopmann, Adam Shehata and Jesper Strömbäck. Mass Communication and Society, 2015.

How does framing politics as a strategic game influence the public’s trust in journalism? This study of Swedish news coverage suggests it lowers trust in all forms of print and broadcast news media — except tabloid newspapers.

The authors note that earlier research indicates people who don’t trust mainstream media often turn to tabloids for news. “By framing politics as a strategic game and thereby undermining trust not only in politics but also in the media, the media may thus simultaneously weaken the incentives for people to follow the news in mainstream media and strengthen the incentives for people to turn to alternative news sources,” write the authors, David Nicolas Hopmann , an associate professor at University of Southern Denmark, Adam Shehata , a senior lecturer at the University of Gothenburg, and Jesper Strömbäck , a professor at the University of Gothenburg.

The three researchers analyzed how four daily newspapers and three daily “newscasts” covered the 2010 Swedish national election campaign. They also looked at the results of surveys aimed at measuring people’s attitudes toward the Swedish news media in the months leading up to and immediately after the 2010 election. The sample comprised 4,760 respondents aged 18 to 74.

Another key takeaway of this study: The researchers discovered that when people read tabloid newspapers, their trust in them grows as does their distrust of the other media. “Taken together, these findings suggest that the mistrust caused by the framing of politics as a strategic game is contagious in two senses,” they write. “For all media except the tabloids, the mistrust toward politicians implied by the framing of politics as a strategic game is extended to the media-making use of this particular framing, whereas in the case of the tabloids, it is extended to other media.”

How journalists use opinion polls

Transforming Stability into Change: How the Media Select and Report Opinion Polls Erik Gahner Larsen and Zoltán Fazekas. The International Journal of Press/Politics, 2020.

This paper demonstrates journalists’ difficulty interpreting public opinion polls. It finds news outlets often reported changes in voter intent when no statistically significant change had actually occurred.

The authors write that they examined political news in Denmark because news outlets there provide relatively neutral coverage and don’t have partisan leanings. They looked at news coverage of polls of voter intent conducted by eight polling firms for eight political parties from 2011 to 2015. Their analysis focuses on 4,147 news articles published on the websites of nine newspapers and two national TV companies.

The researchers learned that journalists tended to report on polls they perceived as showing the largest changes in public opinion. Single outlier polls also got a lot of attention. Not only did many news articles erroneously report a change in public opinion, they often quoted politicians reacting as though a change had occurred, potentially misleading audiences further. Journalists also avoided reporting information on the margin of error for the poll results.

In most cases, the news stories should have been about stability in public opinion, note the authors, Erik Gahner Larsen , senior scientific adviser at the Conflict Analysis Research Centre at the University of Kent in the United Kingdom, and Zoltán Fazekas , an associate professor of business and politics at Copenhagen Business School.

“However, 58 percent of the articles mention change in their title,” they write. “Furthermore, while 82 percent of the polls have no statistically significant changes, 86 percent of the articles does not mention any considerations related to uncertainty.”

The ‘Nate Silver Effect’ on Political Journalism: Gatecrashers, Gatekeepers, and Changing Newsroom Practices Around Coverage of Public Opinion Polls Benjamin Toff. Journalism, 2019.

This study, based on in-depth interviews with 41 U.S. journalists, media analysts and public opinion pollsters, documents changes in how news outlets cover public opinion. It reveals, among other things, “evidence of eroding internal newsroom standards about which polls to reference in coverage and how to adjudicate between surveys,” writes the author, Benjamin Toff , an assistant professor at the University of Minnesota’s Hubbard School of Journalism and Mass Communication. Toff notes that journalists’ focus on polling aggregator websites paired with the growing availability of online survey data has resulted in an overconfidence in polls’ ability to predict election outcomes — what one reporter he interviewed called the “Nate Silver effect.”

Both journalists and polling professionals expressed concern about journalists’ lack of training and their reliance on poll firms’ reputations as evidence of poll quality rather than the poll’s sampling design and other methodological details. Toff, who completed the interviews between October 2014 and May 2015, points out that advocacy organizations can take advantage of the situation to get reporters to unknowingly disseminate their messages.

The study also finds that younger journalists and those who work for online news organizations are less likely to consider it their job to interpret polls for the public. One online journalist, for example, told Toff that readers should help determine the reliability of poll results and that “in a lot of ways Twitter is our ombudsman.”

Toff calls on academic researchers to help improve coverage of public opinion, in part by offering clearer guidance on best practices for news reporting. “The challenge of interpreting public opinion is a collective one,” he writes, “and scholarship which merely chastises journalists for their shortcomings does not offer a productive path forward.”

News Reporting of Opinion Polls: Journalism and Statistical Noise Yosef Bhatti and Rasmus Tue Pedersen. International Journal of Public Opinion Research, 2016.

This paper, which also looks at news coverage of opinion polls in Denmark, finds that Danish journalists don’t do a great job reporting on opinion polls. Most journalists whose work was examined don’t seem to understand how a poll’s margin of error affects its results. Also, they often fail to explain to their audiences the statistical uncertainty of poll results, according to the authors, Yosef Bhatti of Roskilde University and Rasmus Tue Pedersen of the Danish Center for Social Science Research.

The two researchers analyzed the poll coverage provided by seven Danish newspapers before, during and after the 2011 parliamentary election campaign — a 260-day period from May 9, 2011 to Jan. 23, 2012. A total of 1,078 articles were examined.

Bhatti and Pedersen find that journalists often interpreted two poll results as different from each other when, considering the poll’s uncertainty, it actually was unclear whether one result was larger or smaller than the other. “A large share of the interpretations made by the journalists is based on differences in numbers that are so small that they are most likely just statistical noise,” they write.

They note that bad poll reporting might be the result of journalists’ poor statistical skills. But it “may also be driven by journalists’ and editors’ desires for interesting horse race stories,” the authors add. “Hence, the problem may not be a lack of methodological skills but may also be caused by a lack of a genuine adherence to the journalistic norms of reliability and fact-based news. If this is the case, unsubstantiated poll stories may be a more permanent and unavoidable feature of modern horse race coverage.”

About The Author

Denise-Marie Ordway

What's Your Thesis

What's Your Thesis Photo Gallery

What's Your Thesis is a 12 year old horse and has raced in 2016. He was sired by Tiz Wonderful out of the [Add Data] mare [Add Data] . He was trained by and has raced for , and was bred in [Add Data] by [Add Data] . What's Your Thesis has raced at Churchill Downs , Fair Grounds .

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Racehorse success may depend on their gut microbiome in early life

Horses that are bred to race seem to perform better on the course if they had a diverse gut microbiome as foals

By Christa Lesté-Lasserre

7 August 2024

A racehorse’s gut microbiome may influence their health and fitness

Brian Lawless/ PA/Alamy Stock Photo

Racehorses seem to perform better and have a lower risk of health complications if they had diverse gut bacteria as foals.

The findings suggest that, as suspected in humans, the gut microbiome of horses has a critical window for establishing a bacterial composition that may contribute to an individual’s long-term health and fitness.

Christopher Proudman at the University of Surrey in the UK and his colleagues performed DNA sequencing on faecal samples from 52 Thoroughbred foals born on five stud farms in 2018.

Horses used in therapy often avoid people if they are given a choice

They collected samples nine times over the first year of life – at ages 2, 8, 14 and 28 days, and at 2, 3, 6, 9 and 12 months. When a year old, the animals were moved to 29 different race training centres in the UK.

The researchers then measured the horses’ athletic performances when aged 2 and 3 years old during races, including gathering data on finishing positions and total prize money. They also kept records of the horses’ respiratory and orthopaedic health, as well as that of their soft tissues.

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The team found that greater bacterial diversity at 28 days of age was linked to better racing performances. The researchers also detected two families of bacteria, Anaeroplasmataceae and Bacillaceae , that were associated with having a competitive edge.

By contrast, low bacterial diversity at 1, 2 and 9 months of age was associated with an increased risk of orthopaedic issues and other problems, such as muscle strains or “hairline” fractures. The team also found specific bacterial families that when abundant at around 1 or 2 weeks old were linked to greater risks of respiratory or musculoskeletal disease later in life.

The foals that had been treated with antibiotics – which can affect the gut microbiome – in the first few weeks of life had significantly less bacterial diversity at day 28 than their untreated counterparts, says Proudman. These animals later earned less prize money and developed respiratory diseases at 10 times the rate of the non-treated foals after the age of 6 months.

Are horses in equestrian sports being harmed by bending their necks?

Horses experience hyperflexion, or rollkur, when their necks bend far towards their chests – it could place the animal at a greater risk of physical discomfort and stress

It is possible that the early health issues that prompted antibiotic treatment may have been what actually affected later performance and health, says Simon Daniels at the Royal Agricultural University in Gloucestershire, UK. But it is also realistic to think that the antibiotics themselves led to a lack of bacterial diversity that is associated with poorer health and performance, he says.

“While we need more evidence before drawing strong conclusions, it would appear that the way we manage young horses is particularly important for their athletic ability later in life,” says Daniels.

Journal reference:

Scientific Reports DOI: 10.1038/s41598-024-64657-6

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