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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1995;8(1): 23-27.
DOI: https://doi.org/10.5713/ajas.1995.23    Published online February 1, 1995.
Selection for prolificacy in Romney sheep I. Direct response to selection
A. K. F. H. Bhuiyan, M. K. Curran
A selection experiment with Romney Marsh sheep was used to evaluate direct responses to selection. Two flocks were maintained; a) the selection line formed in 1979 by the Romney Group Breeders to select for high prolificacy, defined as the number of live lambs born per ewe joined per year of birth female group and per year respectively were 0.033 and 0.027 live lambs. The rate of predicted response per year was within the theoretical expected range from 0.01 to 0.03 of the mean. The rates of realized response in prolificacy per year of birth female group and per year respectively were 0.026 and 0.021. These estimates of realized responses represented between 0.01 and 0.02 of the control line mean per year.
Keywords: Sheep; Selection; Prolificacy; Direct Response

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