Selenium in Milk from Feeding Small Supplements

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Abstract
Supplements of 0, 1, 2 or 5 mg of Se from sodium selenite fed per cow daily from 90 days prepartum through .apprx. 6 mo. of lactation had no significant effect on Se in milk of Hereford cows. Se in milk was assayed 2-3 days postpartum (average of .014-.023 ppm) and 3 mo. post parturition (average of .016-.021 ppm). The basal diet consisted of medium quality grass-legume hay (.069 mg/kg), ad lib liquid supplement (.152 mg/kg) and 1.36 kg shelled corn (.018 mg/kg) starting in early lactation. Se treatments were administered via free-choice liquid supplement.