Reproductive performance of 130 ewes, including fertility, ovulation rate, litter size, embryo survival, lamb viability, reproductive rate, mean lamb weight at weaning and ewe productivity, were analysed. Ewes were of Sardi, Sardi backcross, FI, F2, D’man backcross and D’man breed groups, all mated to lie de France and Merinos Prfcoce rams. Breed group of ewe had a significant effect (PC.OOl) only on ovulation rate, litter size and reproductive rate. In general, D'man ewes had the highest performance and Sardi ewes had the lowest one. Breed of ram had no significant effect <P>.05) on any trait studied. It was concluded that it is preferable to use a 2 way-cross including ewes with 257 or 757. of D’man genes.

I. Boujenane, M. Akhazzan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 108–111, 1990
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