围产期奶牛干物质摄入水平与产后生产性能及血浆酮体浓度的关系

将围产期奶牛30头随机分为3组,每组10头。其中Ⅱ组为对照组,Ⅰ组和Ⅲ组分别为试验组;Ⅰ、Ⅱ、Ⅲ3组于产前28d开始分别饲喂NRC标准减少20%日粮(能量摄入80%组)、NRC标准日粮(能量摄入100%组)、NRC标准增加20%日粮(能量摄入120%组),产后各组奶牛均饲喂标准日粮,至产后56d结束,观察不同干物质摄入水平对奶牛血浆酮体浓度的影响。试验结果表明:奶牛产后干物质摄入量和产奶量均为Ⅰ组高于Ⅱ组、Ⅱ组又高于Ⅲ组,经统计分析组间差异极显著(P<0.01)或差异显著(P<0.05);此外,Ⅰ组体重消耗最小,Ⅲ组体重消耗最大,各组间差异极显著(P<0.01)。产后Ⅲ组血酮浓度显著高于Ⅰ组和Ⅱ组(P<0.05),而Ⅰ组和Ⅱ组之间差异不明显。可见,围产期奶牛不同干物质摄入量与产奶量、体重等生产性能及产后血酮浓度之间存在着密切的关系。

The Relationships among Dry Matter Intake,Plasma Concentration of Ketone Bodies and Performance in Peripartum Diary Cows

The objective of present study is to determine the relationship among dry matter intake ,plasma concentration of ketone bodies and performance. At 28 days before parturition,thirty healthy perinatal cows were randomly allocated into three groups and fed 100% energy diet (NRC standard diets),120% energy diet and 80% energy diet,respectively. After parturition, all the cows were offered criteria day provisions until 56 days postpartum . The results showed that dry matter intake , milk production in the cows fed 80% enengy diet during the advanced pregency parturition were significant higher than those in the cows fed 100% energy diet and 120% energy diet ,and in the cows fed 100% energy diet were significant higher than those in the cows fed 120% energy diet (P<0.01 or P<0.05). In addition, the cows fed 120% energy diet consumed the most of body weight and the low energy cows costed least(P<0.01). Adverse, the high energy cows have significant higher concentration of ketone bodies than others (P<0.05). From the above results we conclude that the reducing energy intake during the advanced pregenancy of diary cows could enhance dry matter intake, milk production,and alleviate the negative energy equilibrium of postpartum.