应用约翰逊法估测美新杂交褐牛体重

Estimation of the Body Weight of Mei-xin Hybrid Brown Cattle by Johnson Method

中文关键词: 新疆褐牛  美国瑞士褐牛  美新褐牛  约翰逊法估测体重  校正

英文关键词: Xinjiang brown cattle  American Swiss brown cattle  Mei-xin hybrid brown cattle  Johnson method for weight estimation  correction

中文摘要:

      [目的]新疆地区通过引进美国瑞士褐牛导入杂交改良新疆褐牛，以提高新疆褐牛品质和生产性能。研究旨在校正约翰逊估测法中系数，准确估测美新杂交褐牛体重，为今后新疆褐牛选育提高和新类型培育中体重测定提供方法。[方法]试验共测定美新杂交褐牛生产母牛283头，包括体重、体斜长和胸围，通过实测体重与约翰逊法估测体重比较分析，校正约翰逊法公式中系数，再进行验证。[结果]结果表明，美新杂交褐牛实测体重极显著低于约翰逊法估测体重（P<0.01），对约翰逊法公式中的系数校正，校正后系数为12 300，即经过校正后的美新杂交褐牛体重约翰逊法估测公式为：体重=胸围²×体斜长/12300，该公式在50头美新杂交褐牛进行验证，实测体重与估测体重差异不显著（P>0.05），说明校正系数后的约翰逊法公式用来估测美新杂交褐牛估测体重可行，但本次试验实测和验证牛群数较少，还需大量不断验证以获得更可靠的结果。

英文摘要:

      [Objective] The quality and production performance of Xinjiang brown cattle were improved by introducing American Swiss brown cattle into Xinjiang region. The purpose of this study was to determine the body weight of Mei-xin hybrid brown cattle by using Johnson method to estimate the correction coefficient, so as to provide a method for improving the selection and breeding of Xinjiang brown cattle in the future. [Method] A total of 283 cows of Mei-xin hybrid brown cattle in Yili valley were tested, including body weight, body oblique length and chest circumference. The coefficients in Johnson's formula were corrected and verified by comparing the measured body weight with the estimated body weight by Johnson's method. [Result] The results showed that the measured body weight of Mei-xin hybrid brown cattle was significantly lower than that estimated by Johnson's method (P< 0.01). After correction, the coefficient of coefficient in Johnson's formula was 12 300, that is to say, after correction, the estimation formula of Mei-xin hybrid brown cattle weight by Johnson's method was: Body weight = chest circumference² × body slant length/12300, which was verified in 50 Mei-xin hybrid brown cattle. There was no significant difference between the measured weight and the estimated weight (P> 0.05), which indicated that the Johnson method formula after the correction coefficient was feasible to estimate the weight of Mei-xin hybrid brown cattle. However, the number of cattle measured and verified in this experiment was small, and a large number of continuous verifications were needed to obtain more reliable results.