Naser Khakshor; Heydar Zarghi; Ahmad Hassanabadi
Volume 19, Issue 3 , November 2017, , Pages 697-709
Abstract
This experiment was carried out to study the effect of vitamin premix (VP) reduce/withdraw of finisher wheat based diet on growth performance, carcass efficiency, tibia bone ash, and humoral immune response of broiler chickens. Three hundred and fifty, one day-old male broiler chicks (Ross 308) were ...
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This experiment was carried out to study the effect of vitamin premix (VP) reduce/withdraw of finisher wheat based diet on growth performance, carcass efficiency, tibia bone ash, and humoral immune response of broiler chickens. Three hundred and fifty, one day-old male broiler chicks (Ross 308) were used in a complete randomized design (CRD) experiment with 7 treatments of 5 replicates and 10 birds each. The dietary treatments were: T1 (control), fed the basal diet containing 2.5g VP/kg of diet; T2, T3 and T4, The reduce dietary VP levels to 1.25 g/kg of diet from 25, 31 and 37 day of ages respectively; T5, T6 and T7, The complete withdrawal dietary VP from 25, 31 and 37 day of ages respectively. The results showed; reduced dietary VP levels to 1.25g/kg of diet from 25d of age did not impair effects on growth performance. The complete withdrawal dietary VP from 25d significantly decreased growth performance (P<0.05). The reduced/ withdraw dietary VP levels from 25, 31 and 37 day of ages had not significant effects on carcass efficiency, tibia bone ash, and humoral immune response to SRBC injection. It is concluded that it is possible to reduce the vitamin supplements in finisher broiler wheat based diets.
ahmad ali sabetan shiraze; Ahmad Hassanabadi; mohamad javad agah; hasan nasiri moghadam
Volume 19, Issue 2 , August 2017, , Pages 371-387
Abstract
The effects of different dietary levels of olive leaf powder (OLP) as a natural antioxidant on growth performance, carcass traits, some blood parameters, small intestinal morphology and feed digestibility in broiler using a total of 300 one-day-old Cobb500 broilers were studied in a completely randomized ...
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The effects of different dietary levels of olive leaf powder (OLP) as a natural antioxidant on growth performance, carcass traits, some blood parameters, small intestinal morphology and feed digestibility in broiler using a total of 300 one-day-old Cobb500 broilers were studied in a completely randomized design with 5 treatments, 3 replicates and 20 chicks for each replicate, up to 42d. The experimental diets included: corn-soybean meal basal diet (negative control), basal diet supplemented with 250 mg/kg of alpha-Tocopheryl acetate (positive control) and three basal diets containing 2, 2.5 and 3 percent OLP. The results showed that during total experimental period (1-42d), weight gain was decreased (P<0.05) in OLP received groups in comparison with positive control. Feed intake during 1-42d period was decreased (P<0.05) in group which was treated by 3 percent OLP in comparison with positive control group. In starter period, feed conversion ratio was increased (P<0.05) in all groups treated by OLP in comparison with negative and positive controls. Dietary inclusion of different levels of OLP increased (P<0.05) length of villi, crypt depth and villus surface in comparison with the negative or positive controls. A significant decrease (P<0.05) was observed in serum concentrations of the triglycerides, cholesterol and low-density lipoproteins in OLP treated groups in comparison with negative or positive controls. Based on the results, dietary inclusion of OLP up to 2 percent in the broiler diets is recommendable, because it reduces blood lipids and also improves intestinal morphology.