不同瘤胃保护性胆碱对围产后期奶牛酮病发病率和血液代谢指标的影响

Effect of Different Rumen Protected Choline on the Incidence of Ketonopathy and Blood Metabolism in Dairy Cows in the Late Perinatal Period

本试验通过尼龙袋降解试验和饲喂试验,比较两种过瘤胃胆碱的干物质降解率和胆碱保护率及其对围产期奶牛酮病发病率和血液代谢指标的影响。研究分为两个部分:试验一使用尼龙袋法在瘤胃瘘管奶牛上对两种过瘤胃胆碱(A为对照组,B为试验组)的干物质降解率和胆碱保护率进行测定。试验二选取广西某规模化奶牛场的围产牛,采用分阶段对比试验设计,于产前21d开始至分娩分别饲喂含过瘤胃氯化胆碱A和过瘤胃氯化胆碱B的日粮;试验期间全混合日粮(TMR)配方保持不变。试验结果表明:与对照组相比,试验组胆碱的瘤胃干物质降解率较低,过瘤胃保护率较高。试验组奶牛酮病发病率较低;在产后14d和21d,试验组奶牛血液葡萄糖浓度显著增加。综上,根据瘤胃保护率、奶牛酮病发病率和血液代谢试验结果可知,试验组过瘤胃胆碱优于对照组。

The purpose of this experiment was to compare the dry matter degradation rate and choline protection rate of two ruminal chines and their effects on ketosis incidence and blood metabolism in perinatal cows by nylon bag degradation test and feeding test.The study inclueded two parts:in experiment 1,the dry matter degradation rate and choline protection rate of two types of rumen protected choline(A as the control group and B as the experimental group)were measured on rumen fistula cows using the nylon bag method.In experiment 2,perinatal cows from a large-scale dairy farm in Guangxi were selected,and fed a diet containing rumen protected chloride A and B from 21 days before delivery using a phased comparative experimental design,the total mixed ration(TMR)formulation remained unchanged during the trial period.The results showed that compared with the control group,the experimental group has a lower degradation rate of choline in the rumen dry matter and a higher protection rate through the rumen.The incidence rate of ketosis in dairy cows in the experimental group was low.On days 14 and 21 postpartum,choline in the experimental group was able to increase blood glucose concentration.In conclusion,according to rumen protection rate,incidence rate of ketosis and blood metabolism results in dairy cows,the rumen protected choline in the test group is better than that in the control group.