围产期健康奶牛干物质摄入水平与血浆瘦素浓度及乳产量的关系

The Relationships between Dry Matter Intake and Plasma Leptin Concentration, Milk Production in Peripartum Diary Cows

将健康的围产期奶牛 3 0头随机均分为 3组。其中Ⅱ组为对照组、Ⅰ组和Ⅲ组分别为试验组 ;Ⅰ ,Ⅱ ,Ⅲ 3组于产前 2 8d开始分别饲喂NRC标准减少 2 0 %日粮组 (能量摄入 80 %)、NRC标准日粮组 (能量摄入 1 0 0 %)、NRC标准增加 2 0 %日粮组 (能量摄入 1 2 0 %) ,产后各组奶牛均饲喂标准日粮 ,至产后 5 6d结束 ,观察不同干物质摄入水平对奶牛血浆瘦素浓度及产奶量、体重等生产性能的影响。试验结果表明 :奶牛产后干物质摄入量、血浆瘦素浓度和产奶量为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 .0 1 )或差异显著 (P <0 .0 5 ) ;但产前2 8～ 1 4d瘦素浓度组间差异均不显著 (P >0 .0 5 ) ,此后Ⅰ组和Ⅲ组差异显著 (P <0 .0 5 )。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 .0 1 )。可见 ,围产期健康奶牛不同干物质摄入量与血浆瘦素浓度、产奶量。

The objective of present study was to determine the ralationship between dry matter intake, plasma concentration of leptin and milk production. 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, plasma concentration of leptin and milk production in the cows fed 80% enengy diet during the advanced pregnancy parturition were significant highger 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). Results showed that the reducing energy intake during the advanced pregnancy of diary cows could enhance dry matter intake, plasma concentration of leptin and milk production, and alleviate the negative energy equilibrium of postpartum.