Application Effects of Prepartum Dietary Cation-anion Difference in Dairy Cows
The aim of this study was to study the effect of anionic salt addition to the diet of periparturient dairy cows on dry matter intake,urine pH,blood indexes,postpartum diseases and milk yield.In the experiment,sixty multiparous Holstein cows were randomly divided into two groups,thirty cows in each group.The control group was fed diets with DCAD level of 163.4 meq/kg DM (dry matter basis).The experimental group was fed with diets with initial DCAD level of-100.2 meq/kg DM(380g/head/day of anionic salt).During the experiment,the urine pH was stabilized between 6.0 and 6.5 by adjusting the amount of anionic salt.The purpose was research that optimal amount of anionic salt and the relationship between the amount of anionic salt and pH.The experimental diet was fed from prenatal 28 days to delivery,there were 7 days for preparatory feeding.The postpartum experimental group cows and the control group cows were fed the same lactation diet with positive DCAD value.The results showed that the urinary pH value of anionic salt dairy cows was significantly droped to 6.0～6.5 when feed amount was 298g～351g/head/day of in the prenatal period,the prenatal dry matter intake was significantly reduced.The concentration of calcium in serum was increased,but there were no significantly differences among them.The content of parathyroid hormone was significantly reduced.The occurrence of diseases such as gastric displacement,postpartum paralysis,ketosis,blood milk,and elimination rate was reduce.The milk yield curve was stabled at 60 days postpartum,the peak milk was rised quickly,and the time to reach the peak milk production of dairy cows could be shortened.In conclusion,anionic salts in the prenatal period of dairy cows can prevent and prevent the occurrence of hypocalcemia in dairy cows,and effectively improve postpartum health and production performance.
万方数据
维普
