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Home / Equine Research Bank / J Hered / Inbreeding and reproductive performance in standardbred hors...
The Journal of heredity1984; 75(3); 220-224; doi: 10.1093/oxfordjournals.jhered.a109916

Inbreeding and reproductive performance in standardbred horses.

Abstract: The relationship between inbreeding and both conception and foaling rates in Standardbred horses (trotters and pacers) was examined for 1194 breeding years. There was a statistically significant (P less than 0.05) trend for conception and foaling rates to decrease with increased inbreeding; however, this relationship accounted for less than 2 percent of the variation. Additionally, the relationship between reproductive performance and inbreeding was not consistent between trotters and pacers. For trotters (F = 0.103) there was a trend for an increase in conception and foaling rates with increased inbreeding, while for pacers (F = 0.074), reproductive performance decreased with increased inbreeding. Overall, inbreeding does not appear to be a significant factor influencing reproductive performance of Standardbred horses.
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Publication Date: 1984-05-01 PubMed ID: 6736603DOI: 10.1093/oxfordjournals.jhered.a109916Google Scholar: Lookup
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  • Comparative Study
  • Journal Article
  • Research Support
  • Non-U.S. Gov't
  • Research Support
  • U.S. Gov't
  • P.H.S.

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research examines the relationship between inbreeding and reproductive performance in Standardbred horses, finding that inbreeding does not seem to significantly impact reproductive performance.

Research Scope and Methodology

  • The study focused on Standardbred horses – specifically, trotters and pacers.
  • The researchers used data from 1194 breeding years to examine the correlation between inbreeding and reproductive rates.
  • Specifically, they looked at rates of conception and foaling (the process of giving birth to a foal).

Key Findings

  • Higher levels of inbreeding were found to correlate with lower conception and foaling rates.
  • However, this relationship was found to account for less than 2% of the variation in these rates, indicating that inbreeding is not a significant factor influencing reproductive performance.
  • The relationship between inbreeding and reproductive performance differed between the two types of Standardbred horses studied. Among trotters, increased inbreeding marginally improved conception and foaling rates, while among pacers, these rates decreased with increased inbreeding.

Conclusion

  • Overall, this research indicates that inbreeding does not significantly influence the reproductive performance of Standardbred horses. Despite some variations depending on the type of horse, the effect of inbreeding appears minimal at best.

Cite This Article

APA
Cothran EG, MacCluer JW, Weitkamp LR, Pfennig DW, Boyce AJ. (1984). Inbreeding and reproductive performance in standardbred horses. J Hered, 75(3), 220-224. https://doi.org/10.1093/oxfordjournals.jhered.a109916

Publication

The Journal of heredity
ISSN: 0022-1503
NlmUniqueID: 0375373
Country: United States
Language: English
Volume: 75
Issue: 3
Pages: 220-224

Researcher Affiliations

Cothran, E G
    MacCluer, J W
      Weitkamp, L R
        Pfennig, D W
          Boyce, A J

            MeSH Terms

            • Animals
            • Female
            • Horses / genetics
            • Horses / physiology
            • Inbreeding
            • Male
            • Reproduction
            • Statistics as Topic

            Grant Funding

            • R01 HD 14487 / NICHD NIH HHS

            Citations

            This article has been cited 12 times.
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              doi: 10.1007/BF00364526pubmed: 3781570google scholar: lookup
            5. Avila F, Esdaile E, Bellone RR. Using STR Data to Investigate the Impact of the Studbook Cap on Genetic Diversity in the American Standardbred Horse from 1998 to 2021. Genes (Basel) 2025 Jun 27;16(7).
              doi: 10.3390/genes16070748pubmed: 40725405google scholar: lookup
            6. Paim TDP, Hay EHA, Wilson C, Thomas MG, Kuehn LA, Paiva SR, McManus C, Blackburn H. Genomic Breed Composition of Selection Signatures in Brangus Beef Cattle. Front Genet 2020;11:710.
              doi: 10.3389/fgene.2020.00710pubmed: 32754198google scholar: lookup
            7. Krupa E, Žáková E, Krupová Z. Evaluation of inbreeding and genetic variability of five pig breeds in czech republic. Asian-Australas J Anim Sci 2015 Jan;28(1):25-36.
              doi: 10.5713/ajas.14.0251pubmed: 25557673google scholar: lookup
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              doi: 10.5713/ajas.2012.12645pubmed: 25049847google scholar: lookup
            9. Petersen JL, Mickelson JR, Cleary KD, McCue ME. The American Quarter Horse: population structure and relationship to the thoroughbred. J Hered 2014 Mar-Apr;105(2):148-62.
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            10. Petersen JL, Mickelson JR, Cothran EG, Andersson LS, Axelsson J, Bailey E, Bannasch D, Binns MM, Borges AS, Brama P, da Câmara Machado A, Distl O, Felicetti M, Fox-Clipsham L, Graves KT, Guérin G, Haase B, Hasegawa T, Hemmann K, Hill EW, Leeb T, Lindgren G, Lohi H, Lopes MS, McGivney BA, Mikko S, Orr N, Penedo MC, Piercy RJ, Raekallio M, Rieder S, Røed KH, Silvestrelli M, Swinburne J, Tozaki T, Vaudin M, M Wade C, McCue ME. Genetic diversity in the modern horse illustrated from genome-wide SNP data. PLoS One 2013;8(1):e54997.
              doi: 10.1371/journal.pone.0054997pubmed: 23383025google scholar: lookup
            11. Li MH, Strandén I, Tiirikka T, Sevón-Aimonen ML, Kantanen J. A comparison of approaches to estimate the inbreeding coefficient and pairwise relatedness using genomic and pedigree data in a sheep population. PLoS One 2011;6(11):e26256.
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              doi: 10.1371/journal.pone.0005174pubmed: 19367331google scholar: lookup
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