沸石在安格斯公牛上的耐受性评价OA

This research aimed to evaluate the tolerance of beef cattle to zeolite by examing the effects of adding different levels of zeolite in the diet on the growth performance,apparent nutrient digestibility,and blood physiological and biochemical indices of Angus bulls.Eighteen Angus bulls with a body weight of(730.40±11.19)kg were selected and randomly divided into 3 groups,with 6 bulls in each group.The control group(CON group)was fed a basal diet,the effective group(E group)was fed the basal diet supplemented with 0.4％zeolite,and the tolerance group(10E group)was fed the basal diet supplemented with 4.0％zeolite.The experimental period was 49 days,including a 7 day pre-feeding period and a 42 day formal period.The results showed that:1)Adding an effective dose of 0.4％zeolite in the diet can significantly improve the growth performance of beef cattle(P＜0.05),while adding a tolerance dose of 4.0％zeolite had no significant effect on the growth performance of beef cattle(P＞0.05).2)Adding an effective dose of 0.4％zeolite in the diet can significantly increase the apparent digestibility of crude protein(P＜0.05),and there was a tendency to increase the apparent digestibility of neutral detergent fiber(P=0.089),and adding a tolerance dose of 4.0％zeolite had no significant effect on the apparent digestibility of various nutrients(P＞0.05).3)Adding an effective dose of 0.4％zeolite in the diet had no significant effect on blood routine,serum biochemistry,and serum immune indices(P＞0.05),but can significantly improve the antioxidant and anti-inflammatory capacities of the body(P＜0.05).Adding a tolerance dose of 4.0％zeolite had no significant effect on blood biochemical indices(P＞0.05),but significantly reduce the antioxidant and anti-inflammatory capacities of the body(P＜0.05).In conclusion,adding 4.0％zeolite in the diet of fattening beef cattle had no negative effects on the growth performance,apparent nutrient digestibility,and serum biochemical indices of fattening beef cattle,but had negative effects on serum antioxidant and serum inflammatory factor indices,indicating that the tolerance dose of zeolite added in the fattening diet of beef cattle was less than 4.0％.Therefore,in practical production,a supplementation level of 0.4％zeolite is recommended,which can effectively enhance beef cattle production performance while ensuring animal health.