Effects of paraformaldehyde on nitrogen,calcium and phosphorus metabolism in cattle
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.
xylanasenitrogen,calcium and phosphorus metabolismgrowth performancebeefs
万方数据
维普
