Milkability

Random regression models using different functions to model milk flow in dairy cows

M. M. M. Laureano, Bignardi, A. B., L. Faro, E., Cardoso, V. L., Tonhati, H., and Albuquerque, L. G., Random regression models using different functions to model milk flow in dairy cows, vol. 13, pp. 7528-7541, 2014.

We analyzed 75,555 test-day milk flow records from 2175 primiparous Holstein cows that calved between 1997 and 2005. Milk flow was obtained by dividing the mean milk yield (kg) of the 3 daily milking by the total milking time (min) and was expressed as kg/min. Milk flow was grouped into 43 weekly classes. The analyses were performed using a single-trait Random Regression Models that included direct additive genetic, permanent environmental, and residual random effects.

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