Annual, career or single race records for breeding value estimation in race horses
| العنوان: | Annual, career or single race records for breeding value estimation in race horses |
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| المؤلفون: | Christine Blouin, Bertrand Langlois |
| المساهمون: | ProdInra, Migration, Station de Génétique Quantitative et Appliquée (SGQA), Institut National de la Recherche Agronomique (INRA) |
| المصدر: | Livestock Science Livestock Science, Elsevier, 2007, 107, pp.132-141 |
| بيانات النشر: | Elsevier BV, 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Estimation, RACE, Index (economics), General Veterinary, Earnings, 040301 veterinary sciences, [SDV]Life Sciences [q-bio], education, 0402 animal and dairy science, 04 agricultural and veterinary sciences, Heritability, HORSES, 040201 dairy & animal science, GENETIC EVALUATION, [SDV] Life Sciences [q-bio], 0403 veterinary science, Normal distribution, Race (biology), Value (economics), Statistics, Linear regression, Animal Science and Zoology, ComputingMilieux_MISCELLANEOUS, health care economics and organizations, Mathematics |
| الوصف: | The racing careers of 2, 3, 4, and 5-year-old Thoroughbreds and French trotters born in France between 1995 and 1999 were analysed. The horses were evaluated on a set of traits, with particular attention to annual or career earnings and number of starts. As expected, the distributions of earnings corrected for year, age and sex are very skew and thus inappropriate for breeding value estimations. However, Log transformation results in near normal distributions more suitable for this purpose. Another problem of annual or career earnings required a more complex approach. As most horses did not win any money in France (67% of the trotters and 41% of the Thoroughbreds), it is difficult to correctly evaluate these horses. On the other hand, a linear adjustment of the Log of earnings by the Log of the number of starts (exponential adjustment of the earning index) leads to regression coefficients close to 1. It justified the use of the Log of earnings per start and explained its higher heritability in literature. A quadratic adjustment of the Log of earnings by the Log of the number of starts (sigmoid adjustment of the earning index) improves the adjustment for the Thoroughbred only and should be implemented for these horses. The probability of a horse to be placed according to the number of starts was also studied. It is shown that the observed percentage of non-placed horses ps according to the number of starts, s, is in all cases inferior to the expected percentage (ps |
| تدمد: | 1871-1413 |
| DOI: | 10.1016/j.livsci.2006.09.017 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1bdbd24f5d2a1c8044ada494356cf3e https://doi.org/10.1016/j.livsci.2006.09.017 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi.dedup.....b1bdbd24f5d2a1c8044ada494356cf3e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18711413 |
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| DOI: | 10.1016/j.livsci.2006.09.017 |