不同年龄公牦牛对暖季短期精准补饲的生产响应OA

The warm season is a crucial period for the compensatory growth of yaks.However,there is a phased imbalance in the nutritional content of forage.To explore the impact of short-term supplementary feeding of concentrated feed during the warm season on the production performance and economic benefits of different-aged male yaks and to provide a basis for formu-lating an economically efficient seasonal nutritional regulation strategy.Twenty one-year-old,two-year-old,and three-year-old yak bulls from Gannan were selected and randomly divided into the experimental group and the control group according to age,with 10 animals in each group.The experimental period was 92 days(from April 30 to July 30,2025).The experimental group was supplemented with concentrated feed(1 year old:1.0 kg/head/day;2 years old:1.5 kg/head/day;3 years old:2.0 kg/head/day),while the control group was only grazed.The body weight at the beginning and end of the experiment was meas-ured,and the average daily gain,feed conversion rate,and e-conomic benefits were calculated.The results showed that the marginal gain of 1-year-old yaks after supplementary feeding was 0,and the supplementary feeding effect was poor;the marginal gain of 2-year-old yaks reached 21.8 kg/head(P<0.01),with a marginal feed conversion rate of 6.33,and the supplementary feeding brought an additional profit of 125.2 yuan/head;the marginal gain of 3-year-old yaks was only 5.5 kg/head(P<0.05),with a marginal feed conversion rate of 33.33,and the supplementary feeding re-sulted in a loss of 445.8 yuan/head.Compared with supple-mentary feeding during the cold season,the benefits of sup-plementary feeding during the warm season entirely depend on the marginal gain efficiency of supplementary feeding.Conclusion:Under the current market price,short-term sup-plementary feeding during the warm season can achieve prof-itability for 2-year-old yaks in the growth peak period;for 3-year-old yaks,the marginal benefit of supplementary feeding is negative,and they can be directly sold or only used for short-term fattening;1-year-old yaks do not need supplemen-tary feeding during the warm season.This study provides a scientific basis for precise supplementary feeding of yaks in high-altitude pastoral areas and the optimization of forage re-source allocation.