Abstract: To investigate the effect of dietary nano selenium (Se) on the level of Se in cow’s milk, ten healthy Holstein dairy cows were divided into two groups of 5 animals each, i.e., control and test groups. The control group was fed a basal diet and the test group was additionally given 15 g of dietary nano selenium each day for each cow. The results indicated that despite having no significant effect on the contents of milk fat, protein and lactose (P > 0.05), dietary nano selenium significantly increased the level of Se concentration compared with (P < 0.05). The concentration of milk Se was increased gradually with prolonged dietary supplementation, reaching 29.4 μg/L on day 30 compared to only 16.6 μg/L for the control group (P < 0.05). From these results it can be concluded that dietary supplementation with nano-Se could increase the concentration of Se in milk.

Key words: dietary nano selenium; cow; selenium level of cow's milk

摘要： 选择正常健康奶牛随机分为对照组和实验组,每组5头,对照组饲喂基础日粮,实验组饲喂纳米硒15g/(d·头),采集乳样检测乳常规成分和乳硒含量.结果表明:在饲料中添加纳米硒对奶牛的乳蛋白、乳脂肪和乳糖并没有产生显著影响(P＞0.05).与对照组相比,乳硒的含量随着饲喂时间的延长而逐渐增加,30 d实验组乳硒含量为29.4 μg/L,而对照组为16.6 μg/L (P＜0.05),表明添加纳米硒能够增加奶牛乳硒的含量.

关键词: 膳食纳米硒；奶牛；乳硒含量