Faster genetic progress in MOET nucleus schemes could be achieved using indicator traits for milk yield if measurable in immature cattle of both sexes. Blood concentration of metabolites and hormones during normal feeding or fasting in calves has given inconsistent associations with breeding values. However, endogenous growth hormone release in calves following a controlled stimulation with GRF or TRH has shown a positive correlation to breeding value. These findings indicate that pituitary responsiveness may be useful as an indicator of breeding value.

P. Lovendahl, K. Sejrsen, John A Woolliams

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 159–162, 1990
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