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Performance of d'man and sardi sheep on accelerated lambing ii. ovulation rate and embryo survival



Performance of d'man and sardi sheep on accelerated lambing ii. ovulation rate and embryo survival



Small Ruminant Research 2(3): 241-252



Data on four lamb crops in 2.5 years from an experimental flock of sheep established to compare prolific (D'Man) and nonprolific (Sardi) Moroccan breeds of sheep and their crosses are presented. Ovulation rate was recorded following matings in three of four seasons. Mean ovulation rates for ewes 30 months and over were 1.32 for Sardi and 3.18 for D'Man, with 99.7% 1's and 2's in Sardi ewes, and a range of one to seven, with 38% .gtoreq. 4, in D'Man ewes. Prenatal survival was high in both breeds. Pregnant Sardi ewes with two corpora lutea (CL) had a survival rate of 89%, and D'Man ewes had survival rates of 90, 82, 69 and 58% for those with 2, 3, 4 and 5 to 7 CL, respectively. Repeatability of ovulation rate averaged 0.18 for Sardi and 0.29 for D'Man, with corresponding values for litter size of 0.18 and 0.27. Young F1 ewes produced by mating D'Man rams to Sardi ewes were intermediate between the two parent breeds in ovulation rate, and had high prenatal survival.

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Accession: 007640616

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DOI: 10.1016/0921-4488(89)90004-7


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