日粮添加木聚糖酶对肉牛生长性能、氮钙磷代谢的影响

Effects of paraformaldehyde on nitrogen,calcium and phosphorus metabolism in cattle

文章旨在研究日粮中添加木聚糖酶对肉牛营养物质氮、钙和磷代谢的影响,试验将80头身体健康且饲养背景相同的肉牛随机分为4组,每组4个重复,每个重复5头,分别饲喂添加0mg/kg(对照组)、100mg/kg(T1组)、200mg/kg(T2组)、300mg/kg(T3组)木聚糖酶的基础日粮,试验结果表明,(1)与对照组相比,随着木聚糖酶添加量的增加,肉牛末重持续升高,各处理间差异显著(P<0.05);T3组日平均增重显著高于T1组和对照组(P<0.05);(2)与对照组相比,各处理食入氮、粪氮、尿氮、食入钙、粪钙、食入磷、粪磷、氮保留量、钙保留量、磷保留量呈持续上升趋势(P<0.05);T1组尿钙含量显著高于其他处理(P<0.05);T3组尿磷含量显著低于其他处理(P<0.05)。综上所述,日粮中添加木聚糖酶能增加食入氮钙磷、粪中氮钙磷、尿中氮含量,表明木聚糖酶可通过促进肉牛氮钙磷代谢而提高生长性能,以300mg/kg添加量效果最佳。

The aim of this experiment was to investigate the effects of dietary xylanase supplementation on nitrogen,calcium and phosphorus metabolism of beef cattle.A total of 80 healthy beef cattle with the same feeding background were randomly divided into 4 treatments using the“4×4 Latin square”design method,with 4 replicates per treatment and 5 head per replicate.The hens were fed basal diets supplemented with 0mg/kg(control group),100mg/kg(T1 group),200mg/kg(T2 group)and 300mg/kg(T3 group)xylanase,respectively.The experimental results showed as follows:1)Growth performance:Compared with control group,beef final weight continued to increase with the increase of xylanase supplemental level,and there were significant differences among all treatments(P<0.05);The average daily gain in T3 group was significantly higher than that in T1 group and control group(P<0.05).2)Nitrogen,calcium and phosphorus metabolism:Compared with control group,ingestion of nitrogen,fecal nitrogen,urine nitrogen,ingestion of calcium,fecal calcium,ingestion of phosphorus,fecal phosphorus,retention of nitrogen,retention of calcium and retention of phosphorus showed a continuous increasing trend(P<0.05);Urinary calcium content in T1 group was significantly higher than that in other treatments(P<0.05).Urinary phosphorus content in T3 group was significantly lower than that in other treatments(P<0.05).In conclusion,dietary xylanase supplementation can increase the contents of ingestion,fecal and urinary nitrogen,indicating that xylanase can improve the growth performance of beef cattle by promoting the metabolism of nitrogen,calcium and phosphorus,and 300mg/kg supplementation has the best effect.