Realised responses are presented for growth traits following divergent selection for yearling growth rate since 1974 in closed lines of Angus cattle. Selection was for high or low average daily gain from birth to yearling (adjusted for age of dam) with a random bred control line maintained. Following 10 years of selection the difference between the high and low lines in yearling growth rate was greater than 25 )percent for both bulls and heifers. The high line was heavier at birth, 200-day and yearling age than the control line, with the opposite the case for the low line. The divergence between the lines is considered to be sufficient for commencement of a detailed evaluation of the consequences of selection for growth rate on total herd productivity.

P. F Parnell, R. Barlow, B. Tier

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 330–334, 1986
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