Responses to selection for high and low clean fleece weight in two closed selection flocks compared to a randomly selected control over a period of 41 years were used to test for asymmetry in response in the up and downward direction. Similar rates of response were observed in both directions although at a lower rate than predicted from base population heritabilities. Genotype by environment interaction may have contributed to this lower response rate as judged by heritabilities expressed in good and poor production years.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 24: Sheep and goats (fibre); sheep and goats (meat and milk); poultry; horses; buffaloes., , 47–50, 1998
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