Effects of Form of Parenteral or Dietary Selenium Supplementation on Body Weight and Blood, Liver, and Milk Concentrations in Beef Cows1,2 by ProQuest

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In a 365-d study, the effects of form and method of Se supplementation on blood, milk, and tissue Se in grazing beef cows were evaluated. Forty-three Angus cows (115 to 130 d gestation) were randomly assigned to 1 of 5 treatments and received either no Se supplementation (control), one 9-mL barium selenate injection at the initiation of the study, one 5-mL sodium selenite injection + 68 IU vitamin E at the initiation of the study and every 4 mo thereafter, or free-choice minerals containing 26 mg/kg Se as sodium selenite or Se yeast. Cows grazed bahiagrass pastures and most calved during early January 2003. Body weight and plasma and liver Se were measured at d 0 and 365. Whole blood and milk samples were taken at calving and 30, 90, and 205 d postpartum. Cows receiving Se in free-choice minerals were heavier and had a greater increase (P 1200 g/kg) and greater (P 100 g/L) for all treatment groups at calving and at 30 and 90 d postpartum. At 205 d postpartum, cows receiving injectable selenate and both free-choice treatments were adequate in whole blood Se, whereas controls and cows receiving injectable selenite had inadequate whole blood Se. Cows receiving Se yeast produced greater (P 0.05) colostrum Se than all others. No differences were observed in milk Se at 30 and 90 d postpartum amo

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