Ovulation rate of lines of mice selected for testis weight.
Ovulation rate of lines of mice selected for testis weight.
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根据睾丸重量选择的小鼠品系的排卵率。
DOI：
10.1017/s0016672300016207
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
W. G. Hill
中科院分区：
文献类型：
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作者：
A. B. Mafizul Islam;W. G. Hill
对小鼠的高睾丸重量和低睾丸重量进行两次重复选择。通常，从总共 5 代记录的 30 只雄性中选出 7 只雄性。从最初的平均值 191 mg，高品系和低品系之间的平均差异达到 112 mg，实现的遗传力为 0·52。品系的排卵率变化方向与选择方向相同，第 4 代初产雌性的平均差异为 2·0 个卵，第 5 代未产雌性的平均差异为 1·6 个。两性体重也发生了相关变化，但不足以解释观察到的排卵率变化。初产和未产雌性中，排卵率对睾丸重量的遗传回归估计分别为 2·9 和 14 个卵子/100 mg，与其他实验的数据一起，对应于睾丸重量和排卵率分别为 0·50 和 0·25 之间的遗传相关性。产仔数没有相关变化。讨论了在育种计划中利用雄性睾丸大小来提高雌性繁殖性能的可能性。
Selection was practised in two replicates for both high and low testis weight in the mouse. Typically 7 males were selected out of 30 recorded for a total of 5 generations. From an initial average of 191 mg the mean divergence between high and low lines reached 112 mg, with a realized heritability of 0·52. The ovulation rate of the lines changed in the same direction as that of selection, the mean divergence was 2·0 eggs in primiparous females in generation 4 and 1·6 in nulliparous females in generation 5. Correlated changes in the body weight of both sexes also occurred but were inadequate to account for the observed change in ovulation rate. The genetic regressions of ovulation rate on testis weight were estimated to be 2·9 and 14 eggs/100 mg in primiparous and nulliparous females, respectively, which, along with data from other experiments, correspond to genetic correlations between testis weight and ovulation rate of 0·50 and 0·25 respectively. There were no correlated changes in litter size. The possibility of using male testis size in breeding programmes to improve female reproductive performance is discussed.