摘要
湖北省 6个县、市农户饲养的马头山羊繁殖性能调查资料 ,表明马头山羊公、母羔的初情日龄分别为 14 0 4± 16 9和 10 8 4±19 1,母羊发情持续期为 5 8 6h± 15 9h ,发情周期为 19 7d± 1 5d。母羊妊娠 15 0d± 7 4d ,产羔数平均为 (2 14± 0 9)只 ,羔羊成活率平均为 90 8% ,公羔和母羔的初生重分别为 1 61kg± 0 45kg和 1 5 9kg± 0 68kg。妊娠期与胎次无关 ,但随窝产羔数的增加而延长。产羔数以头胎最低 ,第 4胎时达到最高峰 ,然后逐渐降低。羔羊成活率在第 1～ 5胎差异不明显 ,第 6和第 7胎显著降低 ,第 8胎以后又升高。窝产羔数为 1～ 4时 ,羔羊成活率最高 ,产羔数为 5时 ,成活率最低。羔羊初生重与性别有关 ,公羔显著大于母羔。公羔的初生重与胎次有关 ,但与窝产羔数相关关系不明显。头胎母羊所产公羔的初生重最低 ,随胎次的增加 ,初生重有增大的趋势 ,而母羔则没有这种趋势。
Data were collected from farmer household flocks of Matou goat breed in 6 counties of Shiyan city under Hubei Province The results presented that puberties of the male and the female kids were 140 4±16 9 and 108 4±19 1 respectively Estrus duration and cycle averaged 58 6h±15 9 h and 19 7 d±1 5 d respectively Pregnancy period and litter size (LS) averaged 150 d±7 4d and 2 14±0 9 respectively with 90 8% of survival rate of kids Body weights at birth of the male and female kids were 1 61 kg±0 45 kg and 1 59 kg±0 68 kg respectively Pregnancy period was unassociated with parity, but delayed as an increase of LS Survival rates of kids at birth differed remarkably among parity 1 to 5, decreased significantly at parity 6 to 7, and then increased at parity 8 and more Similarly, survival rates at birth of animals kept a high level while LS were 1 to 4, decreased while LS was 5,Body weight of kindling at birth was associated with sex, which the male was heavier than the female ( P <0 001) Body weight at birth of the male was associated with parity, but unassociated with LS Body weight at birth of the male kids was the lowest at parity 1, and then tended to increase as parities However, these changes did not occur in the female kids
出处
《中国草食动物》
2004年第4期35-38,共4页
China Herbivores
