Preparation And Study Of Low Emission Diet For Calves

The effect of crude Protein reduction on the growth performance and fecal and urine excretion indexes of dairy calves.Groupe 1,2 and 3 were fed diets with a standard reduction of Protein of 2%,4%,and 6%,respectively.The results showes: When fed a diet with a 2% reduction in Protein standard,the growth traits of calves were significantly higher than those of the control group,and the apparent digestibility of fecal nitrogen and Phosphorus was significantly higher than that of the control group(P <0.05).The emission of heavy metals is the lowest,so feeding a diet with a 2% reduction in Protein standard is beneficial to improve the absorption of nutrients by animals,reduce the emission of metal elements,and reduce environmental pollution.1.Effects of different crude protein diets on growth performance and feces and urine excretion of calves.Group I,group II and group III were fed diets with standard protein reduction of 2%,4% and 6% respectively.The results were as follows: the growth traits of calves fed the diet with 2% protein reduction were significantly higher than those of the control group,the apparent digestibility of fecal nitrogen and phosphorus were significantly higher than those of the control group(P < 0.05),and the emission of multiple elements and heavy metals in feces and urine was the lowest,Reduce environmental pollution.2.the effects of different fermenting agents on the growth performance and excretion index of feces of calves.The experimental group I,group II and group III were fed with0.1%,0.2% and 0.4% diets respectively.The results are as follows: the increase of 0.1%fermentor in the diet can increase the cumulative growth and absolute growth of calves;The increase of 0.1% and 0.2% of the starter in the diet was beneficial to the growth of calf;The increase of 0.1% fermentor in the diet can improve the apparent digestibility of nitrogen and phosphorus and reduce the nitrogen and phosphorus excretion;The increase of 0.1% fermentor in the diet can reduce the zinc and phosphorus content in urine.Therefore,the increase of 0.1% fermentor in the diet can enhance the nutritional utilization of calves and reduce the excretion of metal elements.3.Effects of different manganese diets on growth performance and feces and urine excretion of calves.Group I,group II and group III were fed with 1% premix-60 mg / kg Mn,-120 mg / kg Mn,-240 mg / kg Mn respectively.The results were as follows: when1% premix reduced 120 mg / kg manganese,the cumulative growth of 30 day calves was significantly higher than that of the control group(P < 0.05);However,different manganese elements in the diet had no significant effect on body size index of calves(P >0.05),indicating that trace element manganese had little effect on body size performance of calves.Moreover,it was found that the reduction of 60 mg / kg,120 mg / kg and 240 mg /kg manganese in 1% premix diet could properly improve the apparent digestibility of nitrogen and phosphorus in faeces and reduce the emission of multiple elements in calves.The highest digestibility of nitrogen and phosphorus was obtained when the reduction of240 mg / kg manganese in 1% premix diet,which could effectively reduce the emission of fecal nitrogen,fecal copper and fecal zinc,and 30 day urinary nitrogen,The effect is the best.