Vitamin E supplementation and stress affect tissue alpha-tocopherol content of beef heifers
| Autor: | A M Craig, C. F. Nockels, Kenneth G Odde |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Vitamin
medicine.medical_specialty Erythrocytes Hydrocortisone medicine.medical_treatment Adipose tissue Cattle Diseases Beef cattle chemistry.chemical_compound Selenium Stress Physiological Internal medicine Genetics medicine Animals Urea Vitamin E Muscle Skeletal Creatine Kinase biology Body Weight food and beverages General Medicine Endocrinology chemistry Adipose Tissue Liver Food Fortified biology.protein Hay Erythrocyte Count Animal Science and Zoology Creatine kinase Cattle Female alpha-Tocopherol Food Science medicine.drug |
| Zdroj: | Journal of animal science. 74(3) |
| ISSN: | 0021-8812 |
| Popis: | The effect of stress on tissue alpha-tocopherol was investigated in 16 crossbred heifers fed a corn/corn silage-based diet. For 28 d, eight heifers (379 +/- 10 kg BW) received a dietary supplement of 1,000 IU of dl-alpha-tocopheryl acetate, whereas the controls (375 +/- 10 kg BW) received no supplemental vitamin E. Tissue samples of plasma, red blood cells, liver, trapezius, and longissimus muscles and subcutaneous fat immediately dorsal to each muscle were taken on d 1 for determination of alpha-tocopherol concentration. On d 2 through 4 each heifer was restricted to 2.61 kg of grass hay and allowed water. On d 5, 6, and 7 no feed or water was given, 100 IU of ACTH and .0024 mg of epinephrine/kg BW were given every 8 h, and biopsies for alpha-tocopherol content were again taken on d 7. The stress reduced (P < .01) mean BW, increased (P < .01) serum cortisol, creatine kinase, and urea. After stress, supplemental vitamin E reduced (P < .13) the increase in creatine kinase relative to that in heifers not supplemented with vitamin E. Stress also increased (P < .04) serum Se in heifers fortified with the vitamin E. Alpha-tocopherol content of plasma, red blood cells, liver, and subcutaneous fat dorsal to the trapezius muscle was increased (P < .01) by supplemental vitamin E. The stress treatment reduced (P < .01) alpha-tocopherol content of plasma in those fed the vitamin E and increased it (P < .05) in the nonsupplemented vitamin E-deficient heifers. Stress also decreased red blood cell (P < .01) and liver (P < .05) alpha-tocopherol content in cattle supplemented with vitamin E. Tissue alpha-tocopherol concentrations were reduced by stress only when a diet adequate in vitamin E was fed. In addition, in most sampled tissues, stress did not affect alpha-tocopherol concentrations. |
| Databáze: | OpenAIRE |
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