The Influence Of Dietary Virginiamycin And Monensin Supplementation On Digestation And Metabolism Of Beef Cattle

There are two part in this paper.Experiment one: Four ruminally, duodenally and ileumally cannulated hybrizided cattles were used to investigate that in the high concentrate diet(C:F=60:40) supplementation with Virginiamycin, Monensin and NaHCO3 had effect on digestation and metabolism . 4×4 Latin square design was used in this paper. The result showed ruminal pH value tended to be higher in cattles fed Virginiamycin, Monensin and NaHCO3, but the difference are not significant (p>0.05).The concentration of NH3-N in cattles from feeding Monensin and NaHCO3 were not obviously different. The concentration of NH3-N in cattles fed Virginiamycin were higher (p<0.05). The concentration of TVFA were highest in the cattles fed Virginiamycin, NaHCO3 and Monensin, however, the total differences were not obvious. The concentration of TVFA in the Virginamycin treatment was obviously higher than the NaHCO3 treatment and others (p<0.05) at 2-9h .It was shown that there were not obviously different for protozoa population among the Virginiamycin,Monensin and NaHCO3 treatment., The content of urea N in the plasm of cattles from feeding Virginiamycin and Monensin were increased (P<0.05), while no change in the NaHCO3 treatment.The concentration of lactic acid were significantly different (p<0.05) by adding various supplements in vitro, and which in the control group is the highest and is the lowest in the Virginiamycin group. The pH of duodenal fluid, iliac fluid and feces in the 4 treatments is remarkably different (p<0.05), especially reached to the most lowness in the control group. The pH of the iliac liquid and feces in the NaHCO3 treatment were higher than which in the contol group,but did not differ. The result above mentioned indicated that dietary NaHCO3 supplementation in short term could neutralize rumen organic acid and at the same time, NaHCO3 adding did not decrease acidity of post-alimentary canal. But Virginiamycin and Monensin could obviously increase pH of post-alimentary canal .Experiment two: Four ruminally, duodenally and ileumally cannulated hybrizided cattles were used to investigate that in the high concentrate diet(C:F=60:40) supplementation with Virginiamycin, Monensin and NaHCO3 had effect on digestation and metabolism . 4×4 Latin square design was used in this paper. The result showed that Virginiamycin and Monensin could not affect the flow of ruminal chyme and the cubage of ruminal fluid, but these the outflux of ruminal chyme and the cubage of ruminal liquid could be increased in the NaHCO3 treatment, which were not benefit on assimilation of nutrients n in the rumen.