Effect of dietary protein and some feed additives on broiler performance
Abstract: The present work aimed to study the effect of different levels of crude protein with adding either pro biotic (Premalac, Lacture and Biobads) or growth promoter (Zinc Bacitracin) on performance of broiler chicks. The experimental work was carried out in Poultry Research Farm, Animal Production Department, Faculty of Agriculture, Cairo University" Crude protein levels were 23 and 21 %, 20 and 18% and 18.5 and 16.5% for starting, growing and finishing periods, respectively to considering recommended level of protein (L1) and low level (L2), respectively. The levels of feed additives were 1g/kg of the diet for Premalac and Lacture, 9 g/kg of the diet for Biobadus and 0.05 g/kg of the diet for Zinc Bacitracin. A total number of 300 unsexed one week-old Arbor-Acres broiler chicks (about 100 g /chicks) were used in this study. Birds were randomly distributed into 10 groups, each contained 30 chicks in 3 replicates.
The results obtained of the study could be summarized as follows:
Recommended levels of CP (L1) and feed additives gave significantly
(P <0.05) better values for both BW and BWG during the experimental periods, when compared with L2 or control (without supplementation). The best values were for Premalac followed by Zinc B. The results of interaction showed that the best performance values were for Premalac with L1 CP (T2), while the least values were for control with L2 CP (T6); L1 crude protein level and feed additives gave significantly (P<0.05) better FCR but did not affect the amount of feed consumed, when compared with L2 or control. The average values of FCR for Lacture and Premalac vs. control were 1.95, 2.00 vs. 2.13 from 1-7 weeks of age.
Recommended levels of CP (L1) gave better values of PI values but lower values of PER during the experimental periods, when compared with L2. Feed additives improved significantly (P <0.05) both PI and PER values when compared with the control group; Recommended levels of CP (L1) improved significantly (p<0.05) digestibility coefficient of EE and CP, while there were no significant effects on either OM, CF, NFE or NB values, when compared with L2. Feed additives improved significantly (P<0.05) digestibility coefficients of OM, CP, CF and NFE when compared with the control. The average values of blood parameters were almost within the normal range indicating that all additives had no adverse effects on blood components, as well as they had no deleterious effects on kidney or liver functions; No significant effect due to either the different levels of crude protein or feed additives on the average values of carcass characteristics or immune organs; L1 crude protein improved the average value of economic efficiency. Adding Lacture or Zinc B. to broiler chick diets gave economic efficiency (0.50) followed by Premalac (0.46). Interaction effect showed that the average value of economic efficiency were 0.50 Lacture or Zinc B. with either L1 or L2 CP followed by 0.48 Premalac with L1 CP.
Publication year 2004
Pages PP. 148
Availability location مكتبة معهد بحوث الانتاج الحيوانى-شارع نادىالصيد- الدقى- الجيزة
Availability number 853
Organization Name
Country Egypt
Author(s) from ARC
Agris Categories Animal feeding
AGROVOC
TERMS		 Blood composition. Broiler chickens. Carcass composition. Economic analysis. Immunity. Performance testing. Probiotics. Proteins.
Proposed Agrovoc premalac;lacture;biobads;growth promoter;zinc bacitracin;
Publication Type Master Thesis
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