Economic values were estimated by regressing profit, adjusted for opportunity cost, up to the end of the 4th lactation on EBVs, using random regressions within herd-year cohort of first calving. Kilograms Fat, kg Protein, milking speed, temperament, rump and conformation all had positive economic values, whereas herd life, angularity, somatic cell score and stature had negative economic values. Both mammary system and fat percentage showed significant interactions with Housing system (Tie-stall vs Free-stall). There were significant variances for herd, year and herd-cohort. Random regressions were not statistically significant. Profit not adjusted for opportunity costs showed a significant positive regression for herd-life, as might be expected, whilst stature showed a large negative regression coefficient (economic value).
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume Genetic Improvement Programs: Breeding objectives, economics of selection schemes, and advances in selection theory (Posters), , 385, 2014
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