张掖肉牛生长发育规律分析

Growth and development of Zhangye beef cattle

中文关键词: 张掖肉牛  生产性能  生长规律  各阶段体重体尺参数

英文关键词: Zhangye beef cattle  Production performance  Growth rule  Body weight and body size parameters of each stage

中文摘要:

      摘要：【目的】在肉牛育种实践中，为了便于育种场间生产水平和牛只间生长性状的比较，解决种牛营养水平调整、体况评定、分等定级和对性能测定数据进行校正时依据零散不标准的问题。【方法】现以核心育种场测定的张掖肉牛性能指标数据为样本，计算样本平均数x ?、标准差S和标准误S_x，对张掖肉牛总体平均数（u）的置信区间做估值，以此为参数，分析体重、体尺间生长规律和相关性，各阶段生长发育规律。【结果】体重、体尺估值参数是以核心育种场测定数据为样本，经t值标准化后的正态分布函数密度值，将张掖肉牛生长发育各阶段进行了区分，反映现阶段张掖肉牛的生产水平。【结论】在育种实践中作为种牛营养水平调整、体况评定、分等定级和对性能测定数据进行校正时参照标准，需要继续进行验证和完善。

英文摘要:

      【 Objective 】 In the practice of beef cattle breeding, in order to facilitate the comparison of production level and growth traits between breeding farms, the problems of nutritional level adjustment, body condition evaluation, grading and calibration of performance measurement data were solved based on scattered non-standard. 【 method 】 now to core determination of alkaline saline beef cattle breeding field performance data as sample, calculate the sample mean, standard deviation S x and the standard error of Sx, in zhang ye beef cattle population mean (u), the confidence interval of valuation, as parameters, analysis of growth rule and correlation among body weight, body measurements, growth and development regularity of each stage. 【 Result 】 Body weight and body size estimation parameters were the density values of normal distribution function after t value standardization, which distinguished the growth and development stages of Zhangye beef cattle and reflected the production level of Zhangye beef cattle at the present stage. 【 Conclusion 】 It should be further verified and improved as a reference standard for adjustment of nutritional level, evaluation of body condition, grading and correction of performance measurement data in breeding practice.