Abstract

The data set consisted of 151,413 test day yields of 22,068 cows calving for the first time from 1992 through 1994. A single trait random regression model was used. The fixed regressions were calculated within four genetic groups (defined according to the proportion of HF genes), four age groups and two seasons.
 

E. Ptak, A. Zarnecki

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 335–338, 1998
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