Breeders were selected with total breeding value for two lines,high prolificacy,and fast growth and high lean. After selecting three generations,both lines have body figure of typical Tibet pig.

采用综合育种值对基础群藏猪按照高繁殖力和快生长高瘦肉率2个方向进行选种。

The effects of combined genotypes of PRL and PRLR have no obvious law. Its genetic effects on prolificacy are not simply the multiplications of every genotype.6.

5．PRL、PRLR合并基因型对多产性的影响无明显规律存在，其对多产性的遗传效应不是各个基因型效应的简单相加。

The estimates of repeatability for litter size, lamb survival, fertility, pregnancy maintenance, prolificacy and birth weight were 0.320, 0.435, 0.208, 0.476, 0.410 and 0.426 respectively.

产羔数、活羔数、受精力、妊娠维持、多胎性和初生重的重复力估值分别为0.320、0.435、0.208、0.476、0.410 和0.426。