North Central Regional Poultry Breeding Laboratory, USDA, ARS, Purdue University, West Lafayette, USA.
Theor Appl Genet. 1978 Sep;52(5):227-31. doi: 10.1007/BF00273894.
Predicted and realized responses in a single generation of mass selection for an index and for its component traits were compared. The index included the log transformed traits determining egg mass in chickens to 40 weeks of age (days tested from sexual maturity, egg weight, rate of lay). The index was restricted to allow no increase in log days tested. Other traits measured were egg mass, age at first egg, egg weight, rate of lay, number of eggs and body weight. When averaged over replicates, realized and predicted responses were in close agreement for index values and for the component traits. Significant corresponding correlated responses were obtained for egg mass and weight. The restricted trait, log days tested, and the correlated trait age at first egg did not change. Egg mass was increased solely through change in egg weight.
在一个世代的大规模选择中，对一个指数及其组成性状进行了预测和实现响应的比较。该指数包括了对数转换的性状，这些性状决定了鸡在 40 周龄时的蛋重（从性成熟开始测试的天数、蛋重、产蛋率）。该指数被限制为不允许对数测试天数的增加。其他测量的性状包括蛋重、首次产蛋年龄、蛋重、产蛋率、蛋数和体重。当在重复中平均时，指数值和组成性状的实现和预测响应非常接近。对于蛋重和体重，获得了显著的相关响应。受限性状，对数测试天数，以及相关性状首次产蛋年龄没有变化。蛋重的增加完全是通过蛋重的变化来实现的。
