Boujenane I, Bradford G E
Dept. of Anim. Prod., Hassan II Agronomy and Veterinary Institute, Morocco.
J Anim Sci. 1991 Feb;69(2):525-30. doi: 10.2527/1991.692525x.
Data from 364 ewes of 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 breed groups mated to F1 rams were analyzed for fertility, number of lambs born alive, litter size at weaning, litter weight at weaning per ewe joined and mean lamb weight at 60 d. Each ewe was exposed in two seasons and had one or two lambings. Effects of breed group were significant for all traits. The highest number of lambs born alive and litter size at weaning were recorded in D'man (1.84 and 1.45, respectively) and D x DS (1.81 and 1.43, respectively). F1 ewes (S x D and D x S) had the highest fertility (.94) and litter weight at weaning per ewe exposed (13.8 kg). Mean lamb weight at 60 d was highest for S x DS and Sardi ewes (13.4 kg and 13.2 kg). D'man additive effects were positive and significant for number of lambs born alive, litter size at weaning and litter weight at weaning per ewe joined; were significant but negative for mean lamb weight at 60 d; and were not significant, although positive, for fertility. Significant individual heterosis was found for fertility, litter weight weaned and mean lamb weight at 60 d. Maternal heterosis and direct epistatic recombination effects were small for all traits.
对364只属于撒丁岛（S）、迪曼（D）、S×DS、DS×S、S×D、D×S（F1）、F2、D×DS和DS×D品种组的母羊进行分析，这些母羊与F1公羊交配，分析其繁殖力、产活羔数、断奶时窝仔数、每只参与配种母羊的断奶窝重以及60日龄时的平均羔羊体重。每只母羊在两个季节接受配种，产羔一到两次。品种组对所有性状的影响均显著。迪曼母羊（产活羔数和断奶时窝仔数分别为1.84和1.45）以及D×DS母羊（产活羔数和断奶时窝仔数分别为1.81和1.43）的产活羔数和断奶时窝仔数最高。F1代母羊（S×D和D×S）的繁殖力最高（0.94），每只受配母羊的断奶窝重最高（13.8千克）。S×DS母羊和撒丁岛母羊60日龄时的平均羔羊体重最高（分别为13.4千克和13.2千克）。迪曼母羊的加性效应在产活羔数、断奶时窝仔数以及每只参与配种母羊的断奶窝重方面为正向且显著；在60日龄时的平均羔羊体重方面显著但为负向；在繁殖力方面虽为正向但不显著。在繁殖力、断奶窝重以及60日龄时的平均羔羊体重方面发现了显著的个体杂种优势。所有性状的母体杂种优势和直接上位重组效应均较小。
