平凉红牛体重估测的约翰逊法系数校正研究

Study on Coefficient Correction of Johnson's Method for Body Weight Estimation in Pingliang Red Cattle

中文关键词: 平凉红牛  约翰逊法  体重估测  体尺性状  系数校正

英文关键词: Pingliang Red Cattle  Johnson’s method  body weight estimation  body measurement traits  coefficient calibration  

中文摘要:

      针对平凉红牛独特体型结构导致的传统约翰逊法体重估测误差问题，对约翰逊法公式中估测系数进行校正，为平凉红牛选育、活畜交易、科学管理等提供一种较准确的体重估测方法。测定100头平凉红牛（处理组50头，验证组50头）的体重、胸围和体斜长，通过反推法计算约翰逊法公式中的校正系数，并采用t检验验证估测值与实测值的差异。公式中原系数为10 080，导致估测值系统性偏高29.51 kg（P＜0.01）；校正后系数为11 175，可使验证误差降至1.77 kg（P＞0.05）。优化后的估测模型显著提高了对平凉红牛体重的估测精度。

英文摘要:

      To address the traditional Johnson method estimation error caused by the unique body structure of Pingliang Red Cattle, this study aims to correct the coefficients of the Johnson method for estimating the breeding and live animal trading of Pingliang Red Cattle. The weight, chest circumference, and body length of 100 Pingliang Red Cattle ( 50 in the treatment group, 50 in the validation group) were measured. The corrected coefficient of the Johnson formula was calculated using the back-calculation method, and t-tests were used to verify the differences between the estimated and actual values. The original coefficient (10080) led to systematic overestimation of the estimated values 29.51kg (P<0.01). After correction, the coefficient 11175 reduced the error in the validation group to 1.77kg (P>0.05). The final formula is: Weight (kg) = Chest Circumference 2 × Body Length / 11175. The corrected coefficient significantly improves the accuracy of weight estimation for Pingliang Red Cattle, but due to sample size limitations , further validation is needed to expand the applicability of the estimation method.