In order to obtain a more efficient increase in prolificacy than that resulting from direct selection on that trait, an indirect selection on ovulation rate, by reducing the generation interval to the maximum and by using superovulation and ova transfer, may be practised (HANRAHAN, 1980; HANRAHAN and QUIRKE, 1980). However, the advantage of that solution depends on the genetic parameters of ovulation rate and litter size. The purpose of this study was to give a first estimation of the heritability of ovulation rate and of the embryonic losses rate in Romanov ewe-lambs and adult ewes belonging to an experimental herd.

G. Ricordeau, J. Razungles, D. Lajous

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 591–595, 1982
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