Meng Guangyao, La Yongfu, Bao Qi, Wu Xiaoyun, Ma Xiaoming, Huang Chun, Chu Min, Liang Chunnian, Yan Ping
Lanzhou Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730050, China.
Key Laboratory of Animal Genetics and Breeding on Tibetan Plateau, Ministry of Agriculture and Rural Affairs, Lanzhou 730050, China.
Animals (Basel). 2023 May 5;13(9):1545. doi: 10.3390/ani13091545.
Understanding animal growth plays an important role in improving animal genetics and breeding. In order to explore the early growth and development law of Ashidan yak, the body weight (BW), wither height (WH), body oblique length (BL) and chest girth (CG) of 260 female Ashidan yaks were measured. These individuals grew under grazing conditions, and growth traits were measured at 6, 12, 18 and 30 months of age. Then the absolute growth and relative growth of Ashidan yak were calculated, and five nonlinear models (Logistic model, Gompertz model, Brody model, von Bertalanffy model and Richards model) were used to fit the growth curve of Ashidan yak. The fitting effect of the model was evaluated according to MSE, AIC and BIC. The results showed that the growth rate of Ashidan yak was the fastest from 12 to 18 months old, and the growth was slow or even stagnant from 6 to 12 months old. The AIC and BIC values of the Richards model were the lowest among the five models, with an AIC value of 4543.98 and a BIC value of 4563.19. The Richards model estimated body weight at 155.642 kg. In summary, the growth rate of female Ashidan yak changes with the seasons, growing faster in warm seasons and slower in cold seasons. Richards model is the best model to describe the growth curve of female Ashidan yak in five nonlinear models.
了解动物生长对改善动物遗传学和育种具有重要作用。为了探究阿什旦牦牛的早期生长发育规律，对260头阿什旦母牦牛的体重（BW）、体高（WH）、体斜长（BL）和胸围（CG）进行了测量。这些个体在放牧条件下生长，生长性状在6、12、18和30月龄时进行测量。然后计算了阿什旦牦牛的绝对生长和相对生长，并使用五个非线性模型（逻辑斯谛模型、冈珀茨模型、布罗迪模型、冯·贝塔朗菲模型和理查兹模型）对阿什旦牦牛的生长曲线进行拟合。根据均方误差（MSE）、赤池信息准则（AIC）和贝叶斯信息准则（BIC）对模型的拟合效果进行评估。结果表明，阿什旦牦牛在12至18月龄时生长速度最快，在6至12月龄时生长缓慢甚至停滞。理查兹模型的AIC和BIC值在五个模型中最低，AIC值为4543.98，BIC值为4563.19。理查兹模型估计的体重为155.642千克。综上所述，阿什旦母牦牛的生长速度随季节变化，温暖季节生长较快，寒冷季节生长较慢。在五个非线性模型中，理查兹模型是描述阿什旦母牦牛生长曲线的最佳模型。
