A 16-week experiment was conducted on 224 three-day-old BUT-9 turkey chickens randomly assigned to 4 groups, each with 4 replicates; each group comprised 7 toms and 7 hens. In successive 4-week periods the basic ration was supplemented with 2 to 5% of a mixture of rape seed oil and poultry fat (66:34) differing in peroxide value in groups I-IV <5, 50, 100 and 150 mEq 0 2 /kg, respectively.The addition of oxidized fat had a negative effect on the growth rate of turkeys, causing significant (PO.01) differences in the body weight of the birds at ages 12 and 16 weeks. At end of the experiment the birds in the control group (I) were an average 1.07 kg heavier than those in groups II-IV; these differences were considerably greater in torn turkeys and averaged 1.7 kg. The lower weight gain in the experimental birds was caused by the approximately 10% smaller consumption of feed than in the control group. Increasing the peroxide value of added fat from 50 mEq 0 2 /kg (group II) to 100 or 150 mEq 0 2 /kg (groups III and IV) did not further reduce body weight. The degree of fat oxidation did not distinctly affect mortality, feed consumption, or slaughter value of the turkeys. The addition of oxidized fat significantly lowered serum and hepatic vitamin E levels and, to a smaller extent, also the vitamin A content in the liver.
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 II, III, and IV, 672 mg/cow/day) and selenium: group I, no supplementation; group II, 4 mg/cow/day as sodium selenite; group III, 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; II-0.0453 mcg/ml; III, 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).
Faba bean hulls fed at the rate of 18.3% DM of the diet decreased crude protein digestibility (P<0.01) and increased N-retention (3.8 g vs 5.5 g) in growing sheep. Significantly higher glucose level and decreased urea content in blood serum has been found within experimental animals.
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