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Abstract

The aim of this study was to estimate genetic and phenotypic (co)variances for lactation curve traits and for days open in Holstein cows. Data included 1 579 lactations from 766 cows, daughters of 126 sires in a dairy herd in northern Mexico. The studied traits within lactation were days open (DO), ...

Author(s)
López-Ordaz, R.; Castillo-Juárez, H.; Montaldo, H. H.
Publisher
Veterinaria Mexico, Revista de la Facultad de Medicina Veterinaria y Zootecnia, Coyoacan, Mexico
Citation
Veterinaria México, 2009, 40, 4, pp 343-356
Abstract

Polynomial regression models of the first, second, and third order were used to fit milk production deviations of daughters in Mexico on Canadian and US predicted transmitting ability values for 305-d mature-equivalent milk production (kg). For the pairs Canada-Mexico and Mexico-United States, 40...

Author(s)
Montaldo, H. H.; Núñez-Soto, S. G.; Ruiz-López, F. J.; Castillo-Juárez, H.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 10, pp 5270-5275