Kosba M A, Hamdy S M, Shebl M K
Beitr Trop Landwirtsch Veterinarmed. 1983;21(3):365-9.
Two Alexandria lines selected for high (HL) and low (LL) body weight and one unselected Fayoumi line were compared for the duration of fertility in both sexes. In the parents, LL had a significantly higher duration of fertility than HL and Fayoumi. In the female progeny, the mean duration of fertility in HL, LL, and Fayoumi were 9.76, 11.20, and 10.66 days, respectively, and the difference among them were highly significant. Based on the sire-plus-dam components of variance, the heritability estimates of the duration of fertility were determined. Heritability estimates obtained by regressed offspring mean on dam estimate were 0.44 in HL, 0.14 in LL, and 0.93 in the Fayoumi. It can be concluded that the genetic variance of this feature - duration of fertility - was relatively high.
选取了两条体重高（HL）和体重低（LL）的亚历山大品系以及一条未经过选择的法尤米品系，对两性的生育期进行比较。在亲代中，LL的生育期显著长于HL和法尤米品系。在雌性后代中，HL、LL和法尤米品系的平均生育期分别为9.76天、11.20天和10.66天，它们之间的差异非常显著。基于父本加母本的方差成分，确定了生育期的遗传力估计值。通过子代均值对母本估计值进行回归得到的遗传力估计值，HL为0.44，LL为0.14，法尤米为0.93。可以得出结论，这个特征——生育期——的遗传方差相对较高。
