The results of Australian and New Zealand selection experiments for growth and fertility in beef cattle are summarised and compared with evidence from other studies. Lines selected for a range of growth criteria generally showed consistent responses in weight and size at all ages, with no significant gffrctg on fertility, maternal performance, dystocia rate or carcass maturity patterns, lim ited evidence indicated positive correlated responses in feed conversion efficiency of breeding cows and growing steers. Divergent selection for calving rate resulted in responses in reproductive performance, but significant interactions with lactational status. Responses in lines selected for pubertal traits indicated favourable realised genetic correlations between scrotal size in bulls and age of first oestrus in heifers.

P. F Parnell, C. A Morris

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 19. Selection and quantitative genetics; growth; reproduction; lactation; fish; fiber; meat., , 20–27, 1994
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