Abstract

The aim of this study was to estimate phenotypic and genetic (co)variances for reproductive and lactation curve characteristic in Holstein cattle using multivariate animal models within the first three parities from 766 cows and 126 sires in a herd in Northern Mexico. Individual lactations were fitted with the Wood's model. Average heritabilities across parities for days open, 305-d milk yield, peak production, day to peak production and persistency were 0.15, 0.25, 0.27, 0.14 and 0.13 respectively. Genetic correlations of 305-d milk yield with peak production and persistency with day to peak production were close to 1. Genetic correlations were favorable between milk production and persistency and unfavorable between days open and lactation curve traits for first-lactation data, but favorable between days open and milk production for second-lactation data.

R. Lopez-Ordaz, H. H Montaldo, H. Castillo-Juarez

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.21, 2006
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