保健系黑白花奶牛体重体尺生长模式及其与产乳性能相关性的研究

研究了保健系黑白花奶牛体重、体尺(体高、体斜长、胸围和管围)的生长模式及其间的相关性;并考虑了体重、体尺分别与305天产乳量的相关程度。结果表明:初生至三胎奶牛体重、体尺之间相关显著,五胎不显著。各阶段的体重、体尺与305天产乳量的相关性三胎显著,一、五胎不显著。

Growth Model of Baojian Line Black and White Dairy Cattle and Correlation Between Body Measurements and Lactation Performance

The growth models of body weight, height at withers, body length, heart girth and circumfer-ence of Cannon bone of Baojian line black and white dairy cattle and the correlation betweenthese body measurements were studied, The correlation between body measurements and dairyyield in 305 days was also observed, The results showed that the regression equations betweenbody measurements (yi) and age in months (X) were: (body weight) y_1=624.5114e~(-11.3976/x)+39.90; (height at withers) y_2=64. 2422e~(-6.4514/x)+74.60; (body length) y_3=142. 3535e~(-11.1938/x)+73. 35; (heart girth)y_4=133. 0134xe~(-7.1327/x)+78. 13; (circumference ofcannon bone); y_5=9. 3032xe~(-8.9393/x)+11.60. Before the third claving, the correlation between5 body measurements was significant (p<0. 05) or highly significant (p<0.01). At first or 5thClaving, no signiticant correlation was observed between every body measurement and dairy yieldin 305 days, but the correlation between dairy yield in 305 days and some body measurementswas significant (p<0.05) at third claving.