A comparison of the productivity of introgressed Merinos d’Arles MAF+ females with equivalent non carrier MA++, pure-bred MA and FI Romanov x MA was conducted over 3 years under extensive management, with an out of breeding season. MAF+ were more efficient for lamb production: +41% weight of 70-day lamb.per ewe joined compared to MA++ or MA, resulting from + 1.2 ovulations/ ovulating ewe, + 0.9 lambs born and + 0.6 lambs weaned/ ewe lambing and despite a lower lamb liveweight at 70 days. This increase in ewe productivity was obtained at the expense of the artificial rearing of one third of the lambs mainly due to a high percentage of litter sizes > 3 (30%). 

J. Teyssier, Jean-Michel Elsen, Loys Bodin, P. Bosc, C. Lefevre, J. Thimonier

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., , 117–120, 1998
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