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Title: Effects of Probiotic, Enzyme and Acidifier to Substitute Antibiotic Growth Promoter on Productive Performance, Blood Parameters and Carcass Characteristics of Broiler
Keywords: Broiler Probiotic, Enzyme, Acidifier, Growth performance, Carcass Characteristics and Serum parameter.
Issue Date: Dec-2017
Publisher: A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Animal and Poultry Nutrition Department of Animal Science and Nutrition Faculty of Veterinary Medicine Chittagong Veterinary and Animal Sciences University Chittagong-4225, Bangladesh
Abstract: The study was conducted at CVASU poultry shed with one hundred Cobb 500™ day old chicks (DOC) for a period of 28 days to investigate the effects of water supplementation with probiotic, enzyme and acidifier as substitute to antibiotic on performance parameters, carcass characteristics and blood parameters in commercial broiler. The study population (DOC) were randomly divided into five dietary treatment groups as T0, T1, T2, T3 and T4 having two replicates each containing 20 birds per replicate. Probiotic, enzyme, acidifier and antibiotic (additives) were supplemented @ 0, 1g, 1.5 g, l.5 ml, & 1 g per 1.5 L for T0, T1, T2, T3 and T4 treatment groups respectively in regular drinking water. Results indicated that the highest average weight gain (100.2 g/d/b) was recorded in T1 group and the lowest average weight gain (88.9 g/d/b) was recorded in T0 group at 4th week. Feed intake differed significantly (p<0.001) at 2nd and (p<0.05) at 4th week. At the same week the highest weekly average feed intake (174.0 g/d) was observed in T1 group and the lowest weekly average feed intake (121.5 g/d) was in T2 group. FCR was also statistically differed (p<0.001) at 2nd and (p<0.05) at 4th week. However, the best average FCR (1.4) was observed in the T2 group and worst FCR (1.6) in T0 and T4 groups. In addition to performance parameter, all treatments had significant (p<0.05) effect on dressing percentage, abdominal and neck fat weight. Similar to performance parameter, ESR differed significantly (p<0.01) at 4th week of probiotic, enzyme and acidifier supplementation. Interestingly, PCV, ESR, TEC, Hemoglobin and all blood cell parameter remained unchanged (p>0.05) throughout the whole experimental period. LDL differed significantly (p<0.05) at 3rd week and Triglyceride differed significantly (p<0.05) at 3rd and 4th week of age and had no influence (p>0.05) on other biochemical parameters. However, supplementation of additives had no influence (p>0.05) on composition of meat excluding ash. Maximum net profit per broiler was obtained from birds containing enzyme supplementation adding in regular drinking water.
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