It is well documented that the functions of vitamin E and selenium (Se) are related and that animal responses to supplementation of either nutrient can depend on the nutritional status of the other nutrient (Weiss and Spears,
2006). Supplementing 740 IU vitamin E/day throughout the dry period reduced incidence of clinical mastitis by
37% and duration of mammary infections by 44% in cows fed a diet low in Se Control cows in
this study had a 41% incidence of clinical mastitis and a 0.41 month duration of infection per quarter lactating
reported that sup- plementing 4000 IU of vitamin E/day for 14 days pre-par- tum reduced new intramammary gland infections and incidence of clinical mastitis in early lactation by 63% and 89%, respectively, compared to control cows fed 100 IU/day. Incidence of clinical mastitis in cows fed 100 IU of vitamin E/day in this study was approximately 27%. Supplementation of cows in this study with 1000 IU of vitamin E/day was less effective (30% vs. 89% reduction) in preventing mastitis than 4000 IU/day In this study all cows were supplemented with 0.1 mg Se/kg diet, a level that would be considered low or marginal relative to requirements. In contrast, Batra et al. (1992) found that supplementation with 1000 IU of vitamin E/day did not affect incidence of clinical mastitis in dairy cows fed diets low in Se (0.10–0.12 mg Se/kg in the diet). Differences in Se status may explain the discrep-ancy in response to vitamin E between these studies Plasma Se concentrations in cows were much lower in the Batra study. Incidence of retained placenta also has been reduced by oral or intramuscular (IM) administra-tion of vitamin E but responses have been variable Erskine et found that IM injection of 3000 IU of vitamin E pre-partum reduced the incidence of metritis as well as retained placenta in dairy cows. reported that responses of dairy cows to a subcutaneous injection of 3000 IU of vitamin E, one week before expected calving, was dependent on pre- treatment vitamin E status. Vitamin E administration reduced the incidence of retained placenta in cows with marginal pre-treatment a-tocopherol concentrations (seruma-tocopherol to cholesterol mass ration
มันคือจัดดีว่า หน้าที่ของวิตามินอีและเกลือ (Se) เกี่ยวข้อง และว่า สัตว์ตอบแห้งเสริมของสารใดสามารถขึ้นอยู่กับโภชนาการของอื่น ๆ สาร (มีร์และหอก2006) การใช้วิตามินอี 740 IU/วัน ตลอดระยะเวลาแห้งลดอุบัติการณ์ของ mastitis คลินิกโดย37% และระยะเวลาของการติดเชื้อทางหน้าอก 44% ในวัวเลี้ยงอาหารในวัว Se ควบคุมในระดับต่ำการศึกษานี้มี 41% อุบัติการณ์ของ mastitis ทางคลินิกและระยะเวลาติดเชื้อต่อการศึกษาไตรมาสเดือน 0.41 reported that sup- plementing 4000 IU of vitamin E/day for 14 days pre-par- tum reduced new intramammary gland infections and incidence of clinical mastitis in early lactation by 63% and 89%, respectively, compared to control cows fed 100 IU/day. Incidence of clinical mastitis in cows fed 100 IU of vitamin E/day in this study was approximately 27%. Supplementation of cows in this study with 1000 IU of vitamin E/day was less effective (30% vs. 89% reduction) in preventing mastitis than 4000 IU/day In this study all cows were supplemented with 0.1 mg Se/kg diet, a level that would be considered low or marginal relative to requirements. In contrast, Batra et al. (1992) found that supplementation with 1000 IU of vitamin E/day did not affect incidence of clinical mastitis in dairy cows fed diets low in Se (0.10–0.12 mg Se/kg in the diet). Differences in Se status may explain the discrep-ancy in response to vitamin E between these studies Plasma Se concentrations in cows were much lower in the Batra study. Incidence of retained placenta also has been reduced by oral or intramuscular (IM) administra-tion of vitamin E but responses have been variable Erskine et found that IM injection of 3000 IU of vitamin E pre-partum reduced the incidence of metritis as well as retained placenta in dairy cows. reported that responses of dairy cows to a subcutaneous injection of 3000 IU of vitamin E, one week before expected calving, was dependent on pre- treatment vitamin E status. Vitamin E administration reduced the incidence of retained placenta in cows with marginal pre-treatment a-tocopherol concentrations (seruma-tocopherol to cholesterol mass ration <2.5 10 3) but not in cows with adequate serum a- tocopherol concentrations.
การแปล กรุณารอสักครู่..
