Effect of recombinant bovine somatotropin administration on milk production, composition and some hemato-biochemical parameters of lactating goats
2007
Sallam, S.M.A.; Nasser, M.E.A., Alexandria University, Alexandria (Egypt). Faculty of Agriculture, Department of Animal Production | Yousef, M.I., Alexandria University, Alexandria (Egypt). Institute of Graduate Studies and Research, Department of Environmental Studies
Fifteen Damascus lactating goats in their third to fourth lactation season and at 30-40 days postpartum were divided into three equal groups. The first group was served as control, while the second and third groups were injected, once every week for 8 weeks, with low or high doses of recombinant bovine somatotropin (rbST), respectively. Supplementation with rbST resulted in a significant increase in total milk yield by 24.3 and 22.5 per cent for 50 mg or 100 mg of rbST, respectively compared with control. Body weight and dry matter intake of does were not affected significantly by rbST treatment. While average daily gain (ADG) of kids that were suckling rbST-treated does was higher than for kids of control does during the treatment period. Supplementation with rbST caused insignificant increase in the levels of total solids, milk protein and fat as compared with control, while lactose significantly increased. On the other hand, ash, haematological parameters, plasma proteins and the activities of plasma aspartate aminotransferase (AST), alanine aminotransferase (ALT), glutathione S-transferase (GST), alkaline phosphatase (AlP), acid phosphatase (AcP), and the levels of thiobarbituric acid-reactive substances (TBARS) and cholesterol were not affected by treatment. The results of the present study suggest that rbST is efficacious in increasing milk yield and kid growth up to 50 mg per 14 days without adverse effects on lactating goats
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