文山牛母牛生长发育规律分析

Analysis of growth and development rules of Wenshan female cattle

中文关键词: 文山牛母牛  体重  体尺性状  相关性分析  回归分析

英文关键词: Wenshan female cattle  body weight  body size  correlation analysis  regression analysis

中文摘要:

      为了解文山牛母牛的体重和体尺性状的生长发育规律，加强文山牛母牛品种选育，进一步提高生产性能，本研究以91头文山牛母牛为试验对象，分别测定0、6、12、18、24和36月龄的体重和体尺指标进行相关性分析和回归分析，从而建立相应的最优回归方程。结果表明：文山牛母牛体重、体高、十字部高、体斜长、胸围、腹围、管围的累计生长量是随着月龄的增长而增加，绝对生长量和相对生长量则是随着月龄的增长而降低，说明文山牛母牛体重和体尺在随着月龄增长而增长，但是其生长强度和速度均在不断下降，表现为早期生长速度较快，后期生长速度缓慢，且在6月龄时达到生长高峰期，分别增长了77.95kg、25.22cm、25.68cm、32.34cm、40.10cm、49.71cm、2.62cm。在不同生长发育阶段体重的变异系数均最大（9.88%、17.25%、18.04%、19.05%、18.50%、16.43%）；除出生阶段外，其次为腹围（15.19%、12.82%、12.79%、12.04%、10.37%）。出生阶段的体斜长和管围相关性不显著（P>0.05），其余各生长阶段各指标间相关性均极显著（P<0.01）。0、6、12、18、24、36月龄时的体重与部分体尺指标的最优回归方程分别为Y1=-23.044+0.247X2+0.362X3+0.978X6（R2=0.677）、Y2=-58.296+1.102X2+0.656X3（R2=0.414）、Y3=-222.431+1.561X1+1.038X3+9.317X6（R2=0.561）、Y4=-319.109+2.534X2+0.982X4+7.987X6（R2=0.693）、Y5=-342.313+2.852X2+1.728X4（R2=0.697）、Y6=-352.721+2.570X1+2.170X4（R2=0.678）。

英文摘要:

      In order to understand the growth and development of body weight and body size traits of Wenshan female cattles, strengthen breed selection and further improve the production performance of Wenshan female cattles.In this study, 91 Wenshan female cattles were selected as experimental subjects. The body weight and body size indexes at 0, 6, 12, 18, 24 and 36 months of age were determined by correlation analysis, regression analysis and the establishment of the optimal regression equation.The results show that the cumulative growth of body weight, body height, cross height, body oblique length, chest circumference, abdominal circumference and tube circumference of Wenshan female cattles increased with the increase of months, while the absolute growth and relative growth decreased with the increase of months, indicating that the body weight and body size of Wenshan female cattles increased with the increase of months, but their strength and speed were constantly declining.The growth rate was fast in the early stage and slow in the late stage, and reached the peak at 6 months of age, increasing by 77.95kg, 25.22cm, 25.68cm, 32.34cm, 40.10cm, 49.71cm and 2.62cm, respectively.The coefficient of variation of body weight in different growth and development stages was the largest (9.88%, 17.25%, 18.04%, 19.05%, 18.50%, 16.43%). In addition to birth stage, abdominal circumference was followed (15.19%, 12.82%, 12.79%, 12.04%, 10.37%).There was no significant correlation between body oblique length and tube circumference at birth stage (P>0.05), but there was significant correlation between other growth stages (P<0.01).The optimal regression equations of body weight and partial body size indexes at 0, 6, 12, 18, 24 and 36 months of age were Y1=-23.044+0.247X2+0.362X3+0.978X6（R2=0.677）、Y2=-58.296+1.102X2+0.656X3（R2=0.414）、Y3=-222.431+1.561X1+1.038X3+9.317X6（R2=0.561）、Y4=-319.109+2.534X2+0.982X4+7.987X6（R2=0.693）、Y5=-342.313+2.852X2+1.728X4（R2=0.697）、Y6=-352.721+2.570X1+2.170X4（R2=0.678）, respectively.