安哥拉山羊级进杂交后代生活力初步观察

对安哥拉山羊及其级进杂交后代的生长发育、繁殖力、抗病性、采食习性等进行初步观察研究，结果表明：在试验场良好的饲养条件下，各代杂种羊生长发育正常，但繁殖力、抗病性、采食能力随级进杂交代数的增加有降低的趋势。据此，笔者认为，在陕北特定的生态经济条件下，培育毛用山羊新品种，级进杂交代数不宜太高，到Ｆ３代应停止级进，进行横交固定，而且在整个育种中，应始终注意饲养问题，以保证新品种培育成功。

Preliminary Observation on Viability of Angora Goat Crosses with Upgrading

Angora goat crosses were observed in growth and development, reproductively, antidisease ability, grazing behavior and some others characters. Results showed that the performance of growth and development were normal in the experimental station for every generation of Angora goat crosses on suitable feeding, however, their reproductively, antidisease and grazing ability to be decreased along with upgrading. It was suggested that the upgrading should not continue under the eco ecological condition of North Shanxi, it should be intermitted for breeding superior mohair goats of North Shanxi until F 3.