论文部分内容阅读
畜禽的选育种主要包括4方面,即选种、选配、品系繁育及杂交优势利用。选种是根据个体的育种值做出留种或淘汰,它的作用在于有目的地改变群内特定基因的频率,使其按人类的要求方向发展。选种的效果是受多因素影响的。在实际选种工作中有3个影响因素是较直接的:1.选择性状的遗传力高低;2.留种率(即选择强度);3.两代间的时间距离即
Breeding of livestock and poultry include four aspects, namely, selection, matching, breeding and cross-breeding advantage of the use of hybrids. Seed selection is based on individual breeding value to make species or elimination, its role is to purposely change the frequency of specific genes within the group, so that it is in the direction of human development. The effect of selection is affected by many factors. In the actual selection of work there are three influencing factors are more direct: 1. Heritability of the selected traits; 2. Probability of seed selection (ie, selection intensity); 3. The distance between two generations of time