Article
Fertility responses of Mexican Holstein cows to US sire selection.
Journal of dairy science - 1 Jul 2006
Cienfuegos-Rivas E G, Blake R W, Oltenacu P A, Castillo-Juarez H
Abstract excerpt
Genetic relationships between 2 fertility traits and milk production were investigated using mature-equivalent lactation records of 55,162 daughters of 1,339 Holstein sires in Mexico and 499,401 daughters of 663 Holstein sires in the northeastern United States. Data sets contained yields in first and second lactation, age at first calving (AFC), and calving interval (CI). There were 474 US sires in common between...
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