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Article| Volume 79, ISSUE 5, P831-837, May 1996

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Effect of Selenium Fertilization on Selenium in Feedstuffs and Selenium, Vitamin E, and β-Carotene Concentrations in Blood of Cattle

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      Abstract

      Selenium (n = 56), total vitamin E, and homologues of natural vitamin E in feedstuffs (n = 52) and the concentrations of Se (n = 241), vitamin E (n = 244), and β-carotene (n = 227) in blood were measured. The mean (±SD) Se content in hay, grass silage, oats, and barley produced using fertilizers enriched with Se was 0.13 (±0.169), 0.17(±0.704), 0.23 (±0.107) and 0.21 (±0.119) mg/kg of DM, respectively, and the mean (±SD) vitamin E contents, calculated as dl-α-tocopherol acetate equivalents, were 39.7 (±13.0), 120.0 (±40.27), 24.4 (±3.83) and 34.5 (±3.57) IU/kg of DM, respectively. The mean Se concentrations in whole blood of cows, heifers, bulls and calves fed hay (n = 62), silage (n = 111), or pasture (n = 68) varied from 183 to 244 μg/l. The mean concentrations of total vitamin E in serum of lactating cows fed hay (n = 21), silage (n = 29) or pasture (n = 26) were 2.8 (±1.43), 6.5 (±3.03) and 8.2 (±2.64) mg/l, respectively. For calves, concentrations of vitamin E in serum were as low as 0.25 mg/L. The mean concentration of β-carotene in serum of lactating cows fed grass silage (n = 26) or pasture (n = 28) was 13.7 (±6.61) and 15.4 (±6.15) mg/L, respectively, but, in lactating cows fed hay (n = 20), concentrations were 2.5 (±1.07) mg/L.

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      References

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