Heinrichs A J, Hargrove G L
Department of Dairy and Animal Science, Pennsylvania State University, University Park 16802.
J Dairy Sci. 1994 Jun;77(6):1676-81. doi: 10.3168/jds.S0022-0302(94)77109-5.
To develop a modern appraisal of growth for Ayrshire, Brown Swiss, and Milking Shorthorn dairy heifers, data on heart girth and height at withers were collected from 1279 Ayrshire heifers (33 herds), 1819 Brown Swiss heifers (46 herds), and 565 Milking Shorthorn heifers (20 herds), ages 1 to 25 mo, in herds located throughout the US. Means and standard deviations were determined for height and heart girth for each month of age. Third-order regressions on age were fitted to the means to describe height and heart girth. Estimated mean height and heart girth at 6, 12, 18, and 24 mo, in centimeters, were for Ayrshire 98.7 and 118.4, 114.4 and 145.9, 122.8 and 163.2, and 127.6 and 176.4; for Brown Swiss 102.6 and 122.3, 199.4 and 151.3, 128.7 and 168.8, and 134.0 and 182.0; and for milking Shorthorn 98.0 and 119.4, 113.6 and 148.6, 122.6 and 166.6, and 127.7 and 179.9, respectively. These data can be useful to evaluate the heifer rearing program with respect to the growth rates of heifers on an individual farm.
为了对爱尔夏牛、瑞士褐牛和乳用短角牛犊牛的生长情况进行现代评估，我们从美国各地的牛群中收集了1279头爱尔夏牛犊牛（33个牛群）、1819头瑞士褐牛犊牛（46个牛群）和565头乳用短角牛犊牛（20个牛群）的胸围和肩高数据，这些牛犊牛的年龄在1至25月龄之间。确定了每个月龄的肩高和胸围的均值及标准差。对月龄进行了三阶回归以拟合均值来描述肩高和胸围。6、12、18和24月龄时，以厘米为单位的估计平均肩高和胸围分别为：爱尔夏牛98.7和118.4、114.4和145.9、122.8和163.2、127.6和176.4；瑞士褐牛102.6和122.3、199.4和151.3、128.7和168.8、134.0和182.0；乳用短角牛98.0和119.4、113.6和148.6、122.6和166.6、127.7和179.9。这些数据对于评估单个农场牛犊牛的生长速度方面的饲养计划可能是有用的。
