Progeny test

Genetic trend for milk yield in Guzerat herds participating in progeny testing and MOET nucleus schemes

M. G. C. D. Peixoto, Verneque, R. S., Teodoro, R. L., Penna, V. M., and Martinez, M. L., Genetic trend for milk yield in Guzerat herds participating in progeny testing and MOET nucleus schemes, vol. 5, pp. 454-465, 2006.

Genetic trends for 305-day milk yield (P305) in Brazilian Guzerat herds under selection were compared. Data from 4898 lactations of 3179 purebred and crossbred cows from various regions of Brazil were used. Milk yield was adjusted for mature age and the contemporary groups were defined as herd and calving year. Genetic parameters were estimated using the MTDFREML program. The model included the random effects of animals and permanent environment, and herd-calving year, calving season and genetic composition as fixed effects.

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