In a CSIRO Sheep Heterosis Experiment, 387 F^ ewes were mated
to either purebred, F1 or F2 rams for studying the effect of male
heterosis on several lamb production traits and to investigate
pro rata retention of male heterosis based on the dominance
hypothesis. Evidence was found to demonstrate the occurrence of a
moderate effect due to the F1 rams (versus the purebreds) and the
dominance hypothesis appeared adequate to account for the pro rata
retention i.e. at 50%, of heterosis in the F2 rams.
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., , 547–552, 1986
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