Effect of vitamin E supplementation in diets with a low concentration of selenium on mammary gland health of dairy cows
| Autor: | K. L. Smith, William P. Weiss, J.S. Hogan, D. A. Todhunter |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Vitamin
medicine.medical_specialty Neutrophils medicine.medical_treatment Mammary gland Ice calving chemistry.chemical_compound Leukocyte Count Selenium Mammary Glands Animal Internal medicine Lactation Genetics medicine Animals Vitamin E Mastitis Bovine Dairy cattle business.industry Colostrum food and beverages medicine.disease Animal Feed Mastitis Diet Endocrinology medicine.anatomical_structure Cholesterol chemistry Animal Science and Zoology Animal Nutritional Physiological Phenomena Cattle Female business Food Science |
| Zdroj: | Journal of dairy science. 80(8) |
| ISSN: | 0022-0302 |
| Popis: | Sixty-six cows and heifers (Holsteins and Jerseys) were assigned to one of three treatments at 60 d before anticipated calving. Treatment 1 consisted of 100 IU/d of supplemental vitamin E during the dry period and 100 IU/d during the first 30 d of lactation. Treatment 2 was 1000 IU/d of vitamin E during the dry period and 500 IU/d during lactation. Treatment 3 was 1000 IU/d of vitamin E during the first 46 d of the dry period, 4000 IU/d during the last 14 d of the dry period, and 2000 IU/d during lactation. Plasma concentrations of alpha-tocopherol decreased at calving for cows fed dietary treatments with low or intermediate concentrations of vitamin E, but not for cows fed the high vitamin E treatment. High dietary vitamin E increased concentrations of alpha-tocopherol in blood neutrophils at parturition, but no difference was found for the other two treatments. The percentage of quarters with new infections at calving was not different (32.0%) between cows receiving treatments that contained low and intermediate concentrations of vitamin E but was reduced (11.8%) in cows receiving the high vitamin E treatment. Clinical mastitis affected 25.0, 16.7, and 2.6% of quarters during the first 7 d of lactation for cows receiving the low, intermediate, and high vitamin E treatments, respectively. Cows with plasma concentrations of alpha-tocopherol3.0 micrograms/ml at calving were 9.4 times more likely to have clinical mastitis during the first 7 d of lactation than were cows with plasma concentrations of alpha-tocopherol3.0 micrograms/ml. |
| Databáze: | OpenAIRE |
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