Boujenane I, Bradford G E, Famula T R
Hassan II Agronomy and Veterinary Institute, Morocco.
J Anim Sci. 1991 Feb;69(2):517-24. doi: 10.2527/1991.692517x.
Data on ovulation rate, litter size and embryo survival of 364 Sardi (S), D'man (D), S x DS, DS x S, S x D, D X S (F1), F2, D x DS and DS x D ewes mated for first and second lambing to F1 rams were analyzed. Breed group, birth group and season had significant effects on ovulation rate and litter size but not on embryo survival. D'man ewes had the highest ovulation rate (2.79) and litter size (2.00), with an essentially linear increase in each of these variables with percentage of D'man inheritance in the ewe (b = .017 +/- .001 CL and .009 +/- .001 lambs born). Embryo survival was influenced only by the number of ova shed. D'man direct genetic effects were higher (P less than .01) than those of Sardi for ovulation rate (+1.78) and litter size (+1.08) but did not differ for embryo survival (-.07). Maternal effects differed little for any of the three traits. Individual heterosis estimates were negative and significant for ovulation rate but not significant for litter size and embryo survival. Maternal heterosis and epistatic recombination effects were small and not significant for any trait.
对364只萨迪（S）、迪曼（D）、S×DS、DS×S、S×D、D×S（F1）、F2、D×DS和DS×D母羊的排卵率、产仔数和胚胎存活率数据进行了分析，这些母羊与F1公羊进行首次和第二次配种产羔。品种组、出生组和季节对排卵率和产仔数有显著影响，但对胚胎存活率没有影响。迪曼母羊的排卵率最高（2.79），产仔数也最高（2.00），随着母羊中迪曼遗传比例的增加，这些变量基本呈线性增加（b = 0.017±0.001 CL和0.009±0.001只出生羔羊）。胚胎存活率仅受排卵数的影响。迪曼的直接遗传效应在排卵率（+1.78）和产仔数（+1.08）方面高于萨迪（P小于0.01），但在胚胎存活率方面（-0.07）没有差异。母体效应在这三个性状中差异不大。个体杂种优势估计值在排卵率方面为负且显著，但在产仔数和胚胎存活率方面不显著。母体杂种优势和上位重组效应较小，对任何性状都不显著。
