This review summarises direct and correlated responses in sheep selection experiments. Realised heritabilities from flocks selected for between 9 and 21 years show reasonably good agreement with heritabilities in the base population. In none of the flocks was there convincing evidence of a selection plateau. The value of these selection flocks for studying correlated responses is illustrated by reference to flocks selected for increased wool production. These have been used to examine correlated changes in efficiency of feed conversion, and related physiological topics, and to examine possible changes in the processing properties of wool.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 181–195, 1986
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