Genetic parameter

Estimates of genetic parameters for stayability and their associations with traits of economic interest in Gir dairy cows

R. M. O. Silva, Boligon, A. A., Fernandes, A. R., Filho, A. E. Vercesi, L. Faro, E., Tonhati, H., Albuquerque, L. G., Fraga, A. B., Silva, R. M. O., Boligon, A. A., Fernandes, A. R., Filho, A. E. Vercesi, L. Faro, E., Tonhati, H., Albuquerque, L. G., and Fraga, A. B., Estimates of genetic parameters for stayability and their associations with traits of economic interest in Gir dairy cows, vol. 15, p. -, 2016.

The objective of the present study was to estimate genetic parameters for stayability at 60 months of age (STAY60) and its association with first lactation cumulative milk yield (P305), age at first calving (AFC), and first calving interval (FCI), in order to adopt these traits as selection criteria for longevity in Gir dairy cattle. Records for 2770 cows born between 1982 and 2008 from six herds in the Brazilian states of Minas Gerais, São Paulo, and Paraíba were analyzed. The (co)variance components were estimated by a Bayesian approach using bivariate animal models.

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