Abstract:Under pure grazing conditions in alpine grasslands,yaks experience negative weight gain for over 6 months during the cold season each year,resulting in a weight loss of approximately 20% to 25% after each cold season.The significant loss of fat during the cold season directly causes significant losses to livestock products,reduces the weight gain rate and increases mortality rate of yaks,and has a serious negative impact on the yak industry.At the same time,it indirectly affects the reproductive performance,milk production performance,and offspring growth and development performance of yaks.Therefore,the significant weight loss during the cold season affects every aspect of yak production,and even the decisive external factor for whether or not it is in heat during the warm season.The significant loss of fat during the cold season not only causes huge direct economic losses,but also causes much greater indirect losses than direct losses.Reducing the weight loss of yaks during the cold season is also the key to improving the production level of the yak industry.
