University of Khartoum

Effect Of Dietary Zinc Bacitracin On Broiler Chicks Performance And Physiological Responses Under Summer Conditions

Effect Of Dietary Zinc Bacitracin On Broiler Chicks Performance And Physiological Responses Under Summer Conditions

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Title: Effect Of Dietary Zinc Bacitracin On Broiler Chicks Performance And Physiological Responses Under Summer Conditions
Author: ELSAEED, AIDA
Abstract: Two experiments were conducted to investigate the effects of subtherapeutic dose levels of zinc bacitracin (ZnB) on physiological responses and performance in broilers chicks under wet and dry tropical conditions of Sudan. Increasing the levels of ZnB resulted in a progressive significant increase in average final body weight (P < 0.01), average total weight gain (P < 0.01), average total feed conversion ratio (P < 0.05), carcass weight (P < 0.01) and dressing percentage (P < 0.05) values during dry summer compared to the control. The increases in the above parameters were only numerical in wet summer except for the dressing percentage values (P < 0.01). The rectal temperature (Tr) and respiratory rate (RR) values showed no significant difference in wet summer. The reductions in Tr and RR values were also not significant in dry summer, but more pronounced and consistent compared to the values of the control. Inclusion of ZnB at 100 mg/kg feed resulted in a significant increase in total plasma protein level (T.P) (P < 0.01) throughout wet summer experiment and a significant increase (P < 0.05) in the last two weeks plasma albumin (AL) compared to the control values. Both plasma T.P and AL of the chicks fed on the above ZnB concentration were significantly higher than control values during week 4 (P < 0.05) and week 5 (P < 0.01) of dry summer period. Addition of ZnB at 75 and 100 mg/kg resulted in a consistent insignificant reduction in plasma cholesterol levels during the last three weeks in wet summer and a significant reduction in the last two weeks in dry summer. The same concentrations of ZnB induced a significant reduction (P < 0.01) in plasma cholesterol during the last two weeks dry summer compared to control. The packed cell volume (PCV) and plasma zinc levels were not affected significantly by ZnB in both wet and dry summer. The influence of ZnB on plasma glucose was not significant during wet summer. However, the treated group receiving 100 mg had higher plasma glucose values in week 3 (P < 0.05) as well as week 4, 5 and 7 (P < 0.01) during dry summer compared to the control. The corresponding values of plasma insulin levels among the chicks fed on the above additive concentration during week 4 were significantly less (P < 0.01) and (P < 0.05) compared to the control value in wet and dry summer respectively. The ZnB at 100 mg/kg feed significantly (P < 0.01) increased plasma iron from week 2 – 6 and the last 3 weeks values of the treated chicks compared to the control during wet and dry summer, respectively. The ZnB at 50 mg/kg feed increased (P < 0.01) last three week blood haemoglobin in wet summer experiment .All the treated chicks had significantly (P < 0.05) higher haemoglobin value in the last week dry summer in compared to the control. The additive at 25 and 75 mg/kg feed induced a significant (P < 0.01) reduction in heterophil: lymphocyte ratio (H : L) in week 7 in wet summer experiment compared to the control, while all the suggested levels of (ZnB) were (P < 0.01) less than the control in week 7 of the dry summer period. The progressive increase in the level of ZnB induced insignificant but consistent reduction in the relative weights of abdominal fat, spleen, liver and heart in wet and dry summer. However, the reduction in liver relative weight of chicks receiving 50, 75 and 100 mg were significantly (P < 0.05) less than the control weigh in wet summer. The data on the effect of 0, 50 and 100 mg ZnB/kg feed on intestinal thickness and nutrient absorption showed that ZnB at 100 mg induced a significant (P < 0.01) reduction in the whole thickness of the duodenum and rectum compared to the control values. Inclusion of the ZnB at 100 mg significantly increased the last three weeks (P < 0.05) faecal protein absorption ,ash (P < 0.05) absorption throughout the study period, the last two week fecal fat, the last three weeks fecal moisture and the values of carbohydrate absorption of week 3 (P < 0.05), 5 (P < 0.05) and 7 (P < 0.05) compared to the control.. The findings obtained in this study suggest that, Zinc Bacitracin at 100 mg/kg feed can be used efficiently in improving broiler body weight, carcass weight and feed conversion ratio under Sudan dry summer conditions, which is in favour of the consumer as well as the producer.
URI: http://hdl.handle.net/123456789/8301
Date: 2015-04-05


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