Quantifying phenotypic and genetic variation for cow fertility phenotypes in American Simmental using total herd reporting data.

Abstract excerpt

Reproduction plays a major role in the production efficiency of livestock species. However, cow-centric reproductive traits tend to be lowly heritable and are not expressed until later in an animal's lifetime, making phenotypic selection alone inefficient at generating genetic gain. Genetic progress can be accelerated by focusing selection on the predicted genetic component of reproductive traits using Expected...

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