1993
DOI: 10.1111/j.1439-0388.1993.tb00738.x
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Relationships of first lactation yields with lifetime performance traits in Holstein cows

Abstract: Genetic and phenotypic correlations between the first lactation and lifetime yields of milk, fat and protein, herdlife, productive life and number of lactations initiated in the herd were estimated from records of 24,231 progeny of 234 young and 119 proven Holstein sires in 1791 herds using a multivariate REML technique to fit a sire model with relationships among young sires. Proven sires were fitted as fixed effects. Genetic correlations between first lactation and lifetime yields were highest for milk (0.66… Show more

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