The Effect of Synchronized Breeding on Genetic Evaluations of Fertility Traits in Dairy Cattle

dc.contributor.advisorBaes, Christine
dc.contributor.advisorSchenkel, Flavio
dc.contributor.authorLynch, Colin of Animal Biosciencesen_US of Guelphen_US of Scienceen_US and Poultry Scienceen_US
dc.description.abstractThrough the use of timed artificial insemination protocols (TAI), it is possible to alleviate the pressure of estrus detection. However, TAI affects the reproductive physiology and endocrinology involved in the estrous cycle, leading to genetically inferior cows’ performance becoming masked. As genetic programs rely on the collection of accurate phenotypic data, phenotypes collected on treated animals likely add bias to genetic evaluations. In this study, to assess the effect of TAI, the rank correlation of bulls for a given trait using only TAI records were compared to the same trait using only heat detection records. Large re-ranking occurred between bulls compared based on either having 100% TAI records or 100% heat detection records, across all traits and parities, indicating that a bias does indeed exist. Methods to account for the bias created by TAI should be investigated, alternatively, fertility traits should be split via management technology into two independent traits.en_US
dc.publisherUniversity of Guelphen_US
dc.rightsAttribution 4.0 International*
dc.subjectfertility traitsen_US
dc.subjecthormonal synchronizationen_US
dc.subjectgenetic evaluationsen_US
dc.titleThe Effect of Synchronized Breeding on Genetic Evaluations of Fertility Traits in Dairy Cattleen_US
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