Study on the Growth and Development of Pinan Crossbred Cows
[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 Bertalan-ffy growth model,with the formula.The inflection point age of body weight is 5.8261 months and the inflection point of body weight is 162.5884 kg.
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