摘要
调查结果表明,四川乳肉兼用母牛的初配年龄在16～24月龄之间,4.5周岁达到成年体尺体重。发情和产犊以9～12自然月为最高,其次为1～4月。牛群结构为成年母牛占42.98%,1.5～4.0岁青年母牛占55.67%,1周岁及以下小母牛1.43%。在所调查1076头繁殖母牛的2157个胎次中,共产犊牛2162头,其中产公犊占50.97%,平均初生重为31.56kg;产母犊占49.03%,平均初生重为29.61kg;公母比为1.04∶1;不同犊牛性别间,公、母牛怀孕期没有明显的差异。产犊间隔平均为381.48天;难产率为0.28%,双胎率为0.28%,犊牛成活率为99.25%。群体第一情期受胎率为33.75%。
s:The result showed that the reproductive performances of Sichuan Dairy-beef dual-purpose cattle were elucidated as follows:The first breeding age was between 16~24 months old.It reached adult body weight and size at 4.5 years.The estrus and calving date of herd were more concentrated on 9~12 months,than 1~4 months,The herd was composed by 42.9% of adult cows,55.67% of 1.5~4.0 years old heifers and 1.43% of female calves under one year.Among 2157 calving times of 1076 breedable cows,total 2162 calves were born,50.97% of total were male,with 31.56kg of average birth weight;49.03% of total were female with average birth weight 29.61kg.The rate between male and female was 1.04∶1.
出处
《中国草食动物》
2006年第1期28-29,共2页
China Herbivores
关键词
乳肉兼用牛
繁殖性能
Dairy-beef dual-purpose cattle
Reproductive performance
