皮南横交母牛生长发育研究

Study on the growth and development of Pinan crossbreeding cows

中文关键词: 皮南牛  体重  体尺  生长模型  拟合分析

英文关键词: Pinan cattle  Body weight  Body size  Growth model  Fitting analysis

中文摘要:

      [目的] 分析皮南牛生长发育规律，初步解析皮南牛体重与体尺性状的相关性。[方法] 收集初生、6月龄、12月龄、18月龄、24月龄、36月龄的皮南横交母牛的体重和体尺数据，统计分析各生长阶段的体重和体尺的增长规律。选用Logistic、Gompertz和Von bertalanffy生长模型，利用R语言的NLS非线性拟合算法对皮南横交母牛的体重增长进行拟合分析，评估最佳拟合模型。检验体重与体尺性状的相关性。[结果] 皮南横交母牛的体重增长的最优拟合模型为Von bertalanffy生长模型。各体尺性状均与体重性状有极显著的相关性，其中，体重与胸围的相关性最强。[结论] 皮南横交母牛的体重增长符合Von bertalanffy生长模型，模型公式为 w_t=〖548.7359(1-0.6194e^(-0.1063t))〗^3，体重拐点月龄为5.8261，拐点体重为162.5884 kg。

英文摘要:

      [Objective] This study aims to analyze the growth and development patterns of Pinan cattle, and preliminarily analyze the correlation between body weight and body size traits of Pinan cattle. [Method] Body weight and body size of newborn, 6-month-old, 12-month-old, 18-month-old, 24-month-old, and 36-month-old Pinan crossbred cows was collected, and the growth patterns of weight and body size at each growth stage were statistically analyzed. Using Logistic, Gompertz, and Von Bertalanffy growth models, the NLS nonlinear fitting algorithm of R language was used to fit and analyze the weight growth of Pinan crossbred cows, and the best fitting model was evaluated. The correlation between body weight and body size was examined. The best fitting model for weight growth in Pinan crossbred cows is the Von Bertalanffy growth model. There is a highly significant correlation between various body size traits and body weight, with body weight having the strongest correlation with chest circumference. [Conclusion] The body weight growth of Pinan crossbred cows conforms to the Von Bertalanffy growth model, with the formula w_t=〖548.7359(1-0.6194e^(-0.1063t))〗^3. The inflection point age of body weight is 5.8261 months and the inflection point of body weight is 162.5884 kg.