عنوان مقاله [English]
In order to compare the existing traditional conditions and the use of slow release bolus containing zinc, selenium and cobalt on performance of pregnant ewes and their lambs, six weeks prior to lambing, 105 ewes were divided into three groups (35 heads each) including: 1) control group; 2) selenium + vitamin E injected group; 3) slow-release bolus given group. Data obtained from all the 35 ewes in each group were used to determine the performance of lambs, but to determine the blood and milk parameters 6 of ewes and their lambs from each group were used. Ewes were blood sampled at 10 days prepartum and 45 and 90 days postpartum, and samples of their milk were collected on day 45 also blood samples of lambs were collected at 10, 45 and 90 days old. Body weight on birth and weaning of lambs and average daily gain of lambs were highest in bloused animals (P<0.05). Lowest percentage of mortality and white muscle disease rate were observed in lambs whose mothers were given bolus. Alkaline phosphatase activity, plasma concentration of zinc and vitamin B12 in bloused animals and their lambs were higher as compared to other treatments (P< 0.05). Glutathione peroxidase activity and plasma concentration of selenium of injected and bloused ewes on day 10 prepartum were higher as compared to control group (P< 0.05) , but these values on day 45 postpartum was only higher in bloused animals (P<0.05). Glutathione peroxidase activity and plasma concentration of selenium in lambs whose mothers were given bolus were higher as compared to other treatments (P< 0.05). Milk concentration of zinc, selenium and vitamin B12 in bloused ewes were higher than animals in other treatments.
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