Wichtel Jeffrey J, Keefe Gregory P, Van Leeuwen John A, Spangler Elizabeth, McNiven Mary A, Ogilvie Timothy H
Department of Health Management, Atlantic Veterinary College, University of Prince Edward Island, 550 University Avenue, Charlottetown, Prince Edward Island C1A 4P3.
Can Vet J. 2004 Feb;45(2):124-32.
Bulk tank milk selenium (Se) concentration was compared with mean serum Se concentration in 15 herds and was found to be an accurate reflection of the herd Se status. The Se status of 109 Prince Edward Island (PEI) dairy herds was monitored for 1 year using bulk tank milk Se concentration. Fifty-nine percent of the herds surveyed were, at some point, found to be marginal or deficient in Se, putting them at risk of disease and suboptimal production. The periods of greatest risk of deficiency were fall and winter, at which time 5% and 4%, respectively, of herds sampled fell in the range considered truly deficient in Se. Herds in which Se supplementation was provided in the form of a commercial dairy concentrate were over 4 times more likely to be Se-adequate than herds not using this method, and adjusted average daily milk yield was 7.6% greater in herds determined to be Se-adequate when compared with Se-marginal herds. We conclude that many dairy producers in PEI are providing insufficient supplementary Se in the ration to meet the recommended Se intake for lactating cows.
对15个牛群的大罐牛奶硒（Se）浓度与平均血清硒浓度进行了比较，发现其能准确反映牛群的硒状况。利用大罐牛奶硒浓度对109个爱德华王子岛（PEI）奶牛场的硒状况进行了为期1年的监测。在调查的牛群中，59%在某些时候被发现处于硒边缘或缺乏状态，这使它们面临疾病风险和生产不理想的问题。缺硒风险最高的时期是秋季和冬季，此时分别有5%和4%的抽样牛群处于真正缺硒的范围内。以商业奶牛浓缩料形式提供硒补充剂的牛群，其硒充足的可能性是未采用此方法的牛群的4倍多，与硒边缘牛群相比，确定为硒充足的牛群调整后的平均日产奶量高出7.6%。我们得出结论，PEI的许多奶牛养殖户在日粮中提供的补充硒不足，无法满足泌乳奶牛推荐的硒摄入量。
