Genetic dissection of reproductive performance of dairy cows under heat stress.

ABSTRACT: Heat stress negatively impacts the reproductive performance of dairy cows. The main objective of this study was to dissect the genetic basis underlying dairy cow fertility under heat stress conditions. Our first goal was to estimate genetic components of cow conception across lactations considering heat stress. Our second goal was to reveal individual genes and functional gene-sets that explain a cow's ability to conceive under thermal stress. Data consisted of 74 221 insemination records on 13 704 Holstein cows. Multitrait linear repeatability test-day models with random regressions on a function of temperature-humidity index values were used for the analyses. Heritability estimates for cow conception under heat stress were around 2-3%, whereas genetic correlations between general and the

SUBMITTER: Sigdel A 

PROVIDER: S-EPMC7383808 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature