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Thirty-two cows (Black-and-White x HF) in the first 100 days of lactation were divided into 4 groups and fed rations composed of equal proportions of roughages and concentrates in amount of 1 kg per 2 kg of milk at yield exceeding 12 kg/day. The concentrates were supplemented with vitamin E (group I , 336 mg; groups I I , I I I , and IV, 672 mg/cow/day) and selenium: group I , no supplementation; group I I , 4 mg/cow/day as sodium selenite; group I I I , 4 mg/cow/day as selenium yeast; group IV, 2 mg/cow/day as selenium yeast. Cows fed selenium-supplemented rations had significantly elevated serum selenium concentrations (group 1,0.0214 mcg/ml; I I 0.0453 mcg/ml; I I I , 0.0654 mcg/ml; IV, 0.0573 mcg/ml). Selenium from yeast was utilized better than sodium selenite. Regardless of the source of selenium, Se lowered serum a-tocopherol (0.245 vs 0.229; 0.187; 0,232 mg/dl) and retinol (35.57 vs 31.46; 32.25; 29.29 mcg/dl) levels. The addition of selenium when the vitamin E content of the ration was increased modified the lipid metabolism of cows (elevated HDL and triglycerides).

journal of animal and feed sciences

The effect of supplementing rations with selenium and vitamin E on biochemical parameters in blood and performance of cows in the early stage of lactation