西黄、黑黄一代母牛生长发育与体型变化的调查分析

通过运用统计方法对陇县西黄一代(SYF_1)、黑黄一代(HYF_1)及本地黄牛初生、3、6、12、18、24、36、48、60及60月龄以上的体重和体尺(包括体高、体长、胸围、臀角宽)资料的分析对比,研究和探讨了杂交后代的生长发育规律,结果表明:当地黄牛经杂交改良后,其体型结构和体质外貌均有明显改观,并趋向于肉用和乳用的要求。此外,作者还就今后的杂交改良工作提出了建议。

An investigation was made in Long county Shaaxi province for growth and development of the female cattle by statistical analysis of body weight and body measurements(including height at withers,body length,heart girty and pin bone width)of first generation crossbred of Simmental with yellow cattle(SyF_1)and Holstein with yellow cattle(HyF_1)and local yellow cattle at birth、3、12、18、24、36、48、60months old more than 5 years old.Result showed that the crossbreeding with Simmental and Holstein cat- tle as the male parent and local yellow cattle as the female parent can rem- arkably improve body size、conformation、and exterior and change product- ive direction.Suggestions have also been made further improvement of local yellow cattle.