This experiment aims to investigate the effects of Alfalfa Hay(AH)on the growth performance,serum biochemical indicators,and nutrient digestibility of yaks in Maqu County,Gannan Tibetan Autonomous Prefecture.Select 48 yaks with similar initial weight and good health,and randomly divide them into 4 groups,with 12 yaks in each group. Among them,the CON group used 100％ oat hay as roughage,while the other three groups replaced oat hay with alfalfa hay at a ratio of 33.33％(LAH group),66.67％(MAH group),and 100％(HAH group),respectively. The pre trial period is 7 days,and the main trial period is 60 days. The results showed that:(1)Compared with the CON group,the average daily weight gain of yaks in the MAH and HAH groups significantly increased by 17.37％ and 15.97％(P<0.05);The feed weight ratio of yaks in the MAH and HAH groups was significantly reduced by 12.54％ and 11.84％(P<0.05).(2)Compared with the CON group,there was no significant difference in serum biochemical indicators among the LAH group,MAH group,and HAH group yaks(P>0.05).(3) Compared with the CON group,the organic matter digestibility of yaks in the MAH and HAH groups was significantly improved(P<0.05);The crude protein digestibility of yaks in the LAH group,MAH group,and HAH group was significantly improved(P<0.05). It can be seen that a medium to high proportion of alfalfa hay in roughage can improve the growth performance of yaks;Low to medium to high proportion of alfalfa hay can improve the nutrient digestibility of yaks. The optimal combination of roughage without considering cost factors is 33.33％ oat hay+66.67％ alfalfa hay.
维普
万方数据