Stage of pregnancy

Effect of pregnancy on the genetic evaluation of dairy cattle

R. J. Pereira, Santana, Jr., M. L., Bignardi, A. B., Verneque, R. S., L. Faro, E., and Albuquerque, L. G., Effect of pregnancy on the genetic evaluation of dairy cattle, vol. 10, pp. 2190-2201, 2011.

We investigated the effect of stage of pregnancy on estimates of breeding values for milk yield and milk persistency in Gyr and Holstein dairy cattle in Brazil. Test-day milk yield records were analyzed using random regression models with or without the effect of pregnancy. Models were compared using residual variances, heritabilities, rank correlations of estimated breeding values of bulls and cows, and number of nonpregnant cows in the top 200 for milk yield and milk persistency.

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