The effectiveness of within-flock genetic improvement programmes is reviewed with particular emphasis on breeding value estimation and genetic trend prediction and estimation. Some recent developments in improving accuracy of breeding value estimation in sheep are mentioned, while the need for precise genetic parameter estimates and appropriate accounting for the effects of selection in field data are highlighted. Realised rates of progress in sheep improvement programmes at the within-flock level have generally not been well documented. The methods available for evaluating genetic trends and the means for better servicing such evaluations in future are discussed.

Kevin D Atkins, B. J McGuirk, R. Thompson

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 605–617, 1986
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