日粮添加硒代蛋氨酸锌对泌乳盛期奶牛泌乳性能和血浆生化指标的影响  

Effect of dietary supplementation of Zn-L-selenomethionine on lactation performance and plasma biochemical indexes of dairy cows in peak lactation period

作　　者：陈一 冀飞 刘建新[1] 王迪铭[1] CHEN Yi;JI Fei;LIU Jianxin;WANG Diming(Institute of Dairy Science,College of Animal Sciences,Zhejiang University,Hangzhou 310058,China;Zinpro Animal Nutrition(International)Inc.,Eden Prairie 55344,Minnesota,USA)

机构地区：[1]浙江大学动物科学学院奶业科学研究所,杭州310058 [2]美国金宝动物营养(国际)有限公司,美国明尼苏达州伊登普雷里市55344

出　　处：《浙江大学学报（农业与生命科学版）》2022年第4期517-524,共8页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：中央高校基本科研业务费专项资金(2021FZZX001-32)。

摘　　要：本试验旨在研究日粮中添加硒代蛋氨酸锌对泌乳盛期奶牛泌乳性能和代谢状态的影响。选取60头健康的中国荷斯坦经产泌乳盛期奶牛,根据泌乳时间、体质量、胎次和产奶量相近的原则,每4头条件相近的奶牛为一个区组,区组内随机分成4组,每处理组15头奶牛。4个处理组分别为对照组(基础日粮,不添加硒代蛋氨酸锌)和硒代蛋氨酸锌添加组(在基础日粮中分别添加含0.1、0.2、0.3 mg/kg Se的硒代蛋氨酸锌,按干物质量计);预饲期2周,正式试验期12周。结果显示:1)随着硒代蛋氨酸锌添加量的增加,奶牛的奶产量、能量校正乳、乳脂产量、乳蛋白产量、乳糖产量和饲料效率呈线性增加(P<0.01)。2)随着硒代蛋氨酸锌添加量的增加,奶牛乳脂含量、乳糖含量和乳中硒含量呈线性或二次增加,乳蛋白含量呈线性降低(P<0.05)。3)随着硒代蛋氨酸锌添加量的增加,奶牛血浆中谷胱甘肽过氧化物酶活性、过氧化氢酶活性呈线性或二次增加(P<0.05),而血浆中丙二醛含量呈线性或二次降低(P<0.01)。综上所述,日粮中添加硒代蛋氨酸锌能够有效改善泌乳盛期奶牛的生产性能和抗氧化能力,提示来源于硒代蛋氨酸锌的硒能被泌乳奶牛有效利用并发挥其生物学效应,是奶牛日粮的有效硒源。The objective of this study was to investigate the effect of dietary supplementation of Zn-Lselenomethionine(Zn-L-SeMet) on lactation performance and metabolic status of dairy cows at peak lactation period. Sixty multiparous Chinese Holstein dairy cows at peak lactation were selected. The cows were divided into15 blocks with four cows in each block based on the similarity principles of the lactation time, body mass, parity and milk yield. The four cows in the same block were randomly assigned to four treatments: the control group(fed with basal diet, without supplementing Zn-L-SeMet), and Zn-L-SeMet supplementation groups(supplementing Zn-L-SeMet with 0.1, 0.2, 0.3 mg/kg Se, respectively, which was calculated in dry matter mass). The prefeeding period was two weeks, and the experiment lasted for 12 weeks. The results showed that: 1) the energy corrected milk,milk, milk fat, milk protein, milk lactose yields and feed efficiency of dairy cows increased linearly(P<0.01) as the supplementation of Zn-L-SeMet increased;2) the milk fat and lactose contents, and Se concentration in milk were improved linearly or quadratically, and the milk protein content was decreased linearly(P<0.05) by administrating increasing amount of Zn-L-SeMet;3) the activities of glutathione peroxidase and catalase in plasma were improved linearly or quadratically(P<0.05) and malondialdehyde content in plasma was decreased linearly or quadratically(P<0.01) with the increase of Zn-L-SeMet supplementation. The above results demonstrate that dietary supplementation of Zn-L-SeMet can effectively improve the performance and antioxidant capacity of dairy cows during the peak lactation. It is suggested that Se from Zn-L-SeMet can be effectively used by lactating cows, and Zn-L-SeMet is an effective dietary Se source.

关 键 词：硒代蛋氨酸锌 荷斯坦奶牛 生产性能 泌乳盛期 抗氧化能力 

分 类 号：S823.91[农业科学—畜牧学]