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01/Feb/2017
Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil
Tatiana Prestes Almeida, Elisandra Lurdes Kern, Darlene dos Santos Daltro, José Braccini Neto, Concepta McManus, André Thaler Neto, [...]
DOI: 10.1590/S1806-92902017000200002
ABSTRACT This study aimed to estimate heritability, genetic, and residual correlations between reproductive traits such as age at first calving, calving interval, dry period, and first service period and linear type traits measured in Holstein cows born between the years 1990 and 2008 in Brazil. The (co)variance components were estimated by restricted maximum likelihood, using the MTDFREML software. The heritability for reproductive traits and linear-type traits ranged from 0.02 to 0.03 and from 0.07 to 0.40, respectively. Estimates of genetic […]
Keywords: age at first calving; dairy cattle; genetic parameters; reproductive efficiency
01/Aug/2003
Genetic correlations among reproductive and growth traits of females, in a Canchim cattle herd
Fernando Molinari Talhari, Maurício Mello de Alencar, Arthur dos Santos Mascioli, Ana Mary da Silva, Pedro Franklin Barbosa
DOI: 10.1590/S1516-35982003000400013
Keywords: adult body weight; age at first calving; beef cattle; growth curve parameters; selection