牦牛体重快速预测公式及其精度分析

Establishment and precision analysis of rapid prediction equations for yak weight

为评价不同预测方法在牦牛活体体重预测中的精度及推广价值,本研究基于地磅法实测数据,对估算法和激光法所产生的预测数据进行分析检验。利用单个和多个体尺指标,共筛选出14个R2较高的体重预测公式。通过对这3种体重测定方法的比较和精度检验,得出估算牦牛体重最优公式为:体重=体斜长×0.009+胸围×0.011+2.34。然而,激光法在预测牦牛体重方面操作最简捷、精度较高,适用性最好。综上,本研究中所建立的预测模型均可在牦牛养殖中进行推广应用。

This study was to evaluate the accuracy and promotion value of different prediction methods for live weight of yak.According to the actual data of the weighbridge method,the estimation method and the laser method were compared,and the prediction data were analyzed and tested.14 single and multiple body size index weight prediction equations with high R~2 were screened.The three weight measurement methods were compared and their accuracy was tested.And the optimal equation for estimating the weight of the yaks was obtained as:weight=oblique body length×0.009+chest circumference×0.011+2.34.Because of its simple operation and high accuracy,the laser method exhibited the best applicability in predicting the weight of yaks.The model established in this study might be popularized and applied in raising yaks.