Estimation of body weight from body size measurements and body condition scores in dairy cows
Estimation of body weight from body size measurements and body condition scores in dairy cows
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DOI：
10.3168/jds.s0022-0302(97)76142-3
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发表时间：
1997-09-01
影响因子：
3.5
通讯作者：
Kristensen, T
中科院分区：
文献类型：
--
作者：
Enevoldsen, C;Kristensen, T
本研究的目的是评估使用臀部的高度和宽度，身体状况评分，以及相关的人口统计学信息来预测奶牛的体重（BW）。从554头奶牛的972个观测数据中建立了7个回归模型。胎次、髋高、髋宽和身体状况评分仅与BW一致相关。多重决定系数为80 ~ 89%。显着条款的数量和模型的参数估计值显着不同组的奶牛。显然，这些差异是由于品种和喂养方案。从这项研究的结果表明，一个可靠的模型估计BW的非常不同的奶牛保持在广泛的环境中，可以开发使用身体状况评分，人口统计学信息，臀部高度和臀部宽度的测量。然而，为了管理的目的，可以通过开发特定于特定地点的模型来获得实质性的改进。
The objective of this study was to evaluate the use of hip height and width, body condition score, and relevant demographic information to predict body weight (BW) of dairy cows. Seven regression models mere developed from data from 972 observations of 554 cows. Parity, hip height, hip width, and body condition score mere consistently associated with BW. The coefficients of multiple determination varied from 80 to 89%. The number of significant terms and the parameter estimates of the models differed markedly among groups of cows. Apparently, these differences were due to breed and feeding regimen. Results from this study indicate that a reliable model for estimating BW of very different dairy cows maintained in a wide range of environments can be developed using body condition score, demographic information, and measurements of hip height and hip width. However, for management purposes, substantial improvements can be obtained by developing models that are specific to a given site.