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Home / Equine Research Bank / J Anim Sci / Effect of inbreeding on the incidence of retained placenta i...
Journal of animal science2004; 82(4); 982-986; doi: 10.2527/2004.824982x

Effect of inbreeding on the incidence of retained placenta in Friesian horses.

Abstract: This study was motivated by the hypothesis that the incidence of retained placenta (RP) in Friesian horses is associated with inbreeding. The objectives were to 1) calculate the inbreeding rate in the total registered Friesian horse population; 2) study the association of the inbreeding coefficient of the foal and the mare with the incidence of RP; and 3) study the heritability of RP in Friesian mares after normal foalings. Data from the total registered Friesian horse population from 1879 to 2000 (52,392 individuals) were collected from the registration files of the Friesian Horse Studbook. In 1999 and 2000, 495 parturitions in 436 mares were studied. From 1979 to 2000, the inbreeding rate of the total population was 1.9% per generation. The regression coefficients for the regression of the incidence of RP on inbreeding coefficients of the foal and the mare were 0.12 +/- 0.052 and -0.016 +/- 0.019, respectively. Mean heritability estimates of RP as a foal trait and as a mare trait were 0.046 +/- 0.088 and 0.105 +/- 0.123, respectively. It was concluded that, in order to avoid a further increase in the incidence of RP in Friesian mares, a decrease in the inbreeding rate by increasing the effective breeding population is required. Furthermore, the findings indicate that the high incidence of RP in Friesian horses is at least partly a result of inbreeding.
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Publication Date: 2004-04-15 PubMed ID: 15080317DOI: 10.2527/2004.824982xGoogle Scholar: Lookup
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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.

The research article investigates if inbreeding in Friesian horses contributes to a higher incidence of retained placenta. The study used data from approximately 52,000 Friesian horses to determine links between inbreeding rates and resultant complications during foaling, particularly retained placenta.

Objectives and Data Collected

  • The paper sets out to calculate the inbreeding rate in the Friesian horse population, establish an association between the rate of inbreeding and incidence of retained placenta, and discuss the heritability of retained placenta in Friesian mares.
  • Data was sourced from the Friesian Horse Studbook, covering the period from 1879 to 2000 and containing records of 52,392 individuals.
  • Parturitions in 436 mares during 1999 and 2000 were closely examined to provide more detailed data.

Inbreeding Rate and Regression Coefficients

  • The inbreeding rate for Friesian horses was found to be 1.9% per generation for the time period studied (1879 to 2000).
  • The correlation between a foal’s inbreeding coefficient and the incidence of retained placenta was represented by a regression coefficient of 0.12. Despite the considerable variation, this indicates a positive relationship between inbreeding and retained placenta.
  • On the contrary, the corresponding regression coefficient for the mare was -0.016, indicating a negligible or no clear relationship between a mare’s inbreeding coefficient and the incidence of retained placenta.

Heritability Estimates

  • Heritability estimates were determined for both foal and mare.
  • For foal traits, the calculated heritability of retained placenta was 0.046, while for mares, the corresponding heritability estimate was 0.105.
  • The estimates, especially for the foal trait, while positive, come with significant variance, implying that more research is necessary for a definitive conclusion.

Conclusions and Recommendations

  • The researchers conclude that a decrease in the inbreeding rate could help mitigate the rising occurrence of retained placenta in Friesian mares. To achieve this, the study suggests augmenting the effective breeding population.
  • Moreover, the findings underpin the view that a significant portion of retained placenta cases in Friesian Horses can be attributed to inbreeding.

Cite This Article

APA
Sevinga M, Vrijenhoek T, Hesselinks JW, Barkema HW, Groen AF. (2004). Effect of inbreeding on the incidence of retained placenta in Friesian horses. J Anim Sci, 82(4), 982-986. https://doi.org/10.2527/2004.824982x

Publication

Journal of animal science
ISSN: 0021-8812
NlmUniqueID: 8003002
Country: United States
Language: English
Volume: 82
Issue: 4
Pages: 982-986

Researcher Affiliations

Sevinga, M
  • Veterinary Practice Mid-Fryslân, Akkrum, The Netherlands. sevinga@xs4all.nl
Vrijenhoek, T
    Hesselinks, J W
      Barkema, H W
        Groen, A F

          MeSH Terms

          • Animals
          • Female
          • Horse Diseases / epidemiology
          • Horse Diseases / genetics
          • Horses / genetics
          • Horses / physiology
          • Inbreeding
          • Incidence
          • Male
          • Netherlands / epidemiology
          • Placenta, Retained / epidemiology
          • Placenta, Retained / genetics
          • Placenta, Retained / veterinary
          • Pregnancy
          • Regression Analysis
          • Risk Factors

          Citations

          This article has been cited 9 times.
          1. Esdaile E, Avila F, Bellone RR. Analysis of Genetic Diversity in the American Standardbred Horse Utilizing Short Tandem Repeats and Single Nucleotide Polymorphisms. J Hered 2022 Jul 9;113(3):238-247.
            doi: 10.1093/jhered/esab070pubmed: 34893836google scholar: lookup
          2. Doekes HP, Bijma P, Windig JJ. How Depressing Is Inbreeding? A Meta-Analysis of 30 Years of Research on the Effects of Inbreeding in Livestock. Genes (Basel) 2021 Jun 18;12(6).
            doi: 10.3390/genes12060926pubmed: 34207101google scholar: lookup
          3. Próchniak T, Kasperek K, Knaga S, Rozempolska-Rucińska I, Batkowska J, Drabik K, Ziȩba G. Pedigree Analysis of Warmblood Horses Participating in Competitions for Young Horses. Front Genet 2021;12:658403.
            doi: 10.3389/fgene.2021.658403pubmed: 33936176google scholar: lookup
          4. Nagel C, Melchert M, Aurich C, Aurich J. Differences in Endocrine and Cardiac Changes in Mares and Her Fetus before, during, and after Parturition in Horses of Different Size. Animals (Basel) 2020 Sep 4;10(9).
            doi: 10.3390/ani10091577pubmed: 32899617google scholar: lookup
          5. Jaworska J, Tobolski D, Janowski T. Is similarity in Major Histocompatibility Complex (MHC) associated with the incidence of retained fetal membranes in draft mares? A cross-sectional study. PLoS One 2020;15(8):e0237765.
            doi: 10.1371/journal.pone.0237765pubmed: 32804960google scholar: lookup
          6. Jaworska J, Ropka-Molik K, Wocławek-Potocka I, Siemieniuch M. Inter- and intrabreed diversity of the major histocompatibility complex (MHC) in primitive and draft horse breeds. PLoS One 2020;15(2):e0228658.
            doi: 10.1371/journal.pone.0228658pubmed: 32012208google scholar: lookup
          7. Warnakulasooriya DN, Marth CD, McLeod JA, Hanlon DW, Krekeler N. Treatment of Retained Fetal Membranes in the Mare-A Practitioner Survey. Front Vet Sci 2018;5:128.
            doi: 10.3389/fvets.2018.00128pubmed: 29971242google scholar: lookup
          8. Smith FL, Watson JL, Spier SJ, Kilcoyne I, Mapes S, Sonder C, Pusterla N. Frequency of shedding of respiratory pathogens in horses recently imported to the United States. J Vet Intern Med 2018 Jul;32(4):1436-1441.
            doi: 10.1111/jvim.15145pubmed: 29761571google scholar: lookup
          9. Ishii M, Aoki T, Yamakawa K, Magata F, Gojo C, Ito K, Kayano M, Nambo Y. Relationship between the Placental Retention Time and the Reproductive Performance at the Foal Heat in Thoroughbred and a Comparison with Heavy Draft. J Equine Sci 2013;24(2):25-9.
            doi: 10.1294/jes.24.25pubmed: 24833998google scholar: lookup
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