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Subject: Animal Nutrition × Author: ALI, MOKADESH × Start date: 2000 × Type: Thesis ×
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    ThesisItemOpen Access
    EFFECT OF DIETARY SUPPLEMENTATION OF CYSTEINE-PROTEASE AND 1,4-β-XYLANASE AND THEIR COMBINATION IN LOW PLANE OF NUTRITION ON GROWTH PERFORMANCE OF COMMERCIAL BROILER CHICKEN
    (College of Veterinary Science, Assam Agricultural University, Khanapara, Guwahati, 2021-12) ALI, MOKADESH; Saikia, Gunaram
    An experiment was conducted to study the effect of dietary supplementation of cysteine- protease and 1,4-β-xylanase and their combination in low plane of nutrition on growth, nutrient utilization, blood biochemical profile, carcass characteristics and to evaluate economics of feeding in commercial broiler chicken. One hundred sixty (N=160) commercial broiler chicks (Vencobb 400) were randomly distributed into 4 groups (T0, T1, T2 and T3) on live weight basis comprising of 40 chicks in each group with four replicates of 10 chicks in each. The control group (T0) was fed with a standard pre-starter, starter and finisher broiler ration as per ICAR (2013) specifications. The chicks belong to group (T1) was fed with standard ration but supplemented with cysteine-protease (32500 PU/kg of feed) and 1,4-β-xylanase (16000 BXU/kg of feed) as per recommended dose of manufacturer. Birds belong to group T2 and T3 were fed rations with 4 and 6 percent lower crude protein (CP) and metabolizable energy (ME) content than ICAR (2013) specifications, respectively with supplementation of both cysteine-protease (32500 PU/kg of feed) and 1,4-β-xylanase (16000 BXU/kg of feed) in all pre-starter, starter and finisher phases. At the end of pre-starter, starter and finisher phases blood samples were collected and analysed for blood biochemical parameters. Four birds from each group were slaughtered to study the carcass characteristics and chemical composition of meat. The economics of feeding and broiler production were evaluated. Highly significant (p0.05) differences were observed in total feed intake, retention of calcium and phosphorus, dressing percentage, yield of prime cuts, yield of lymphoid organs, chemical composition of meat, serum total protein, albumin, globulin and gamma glutamyl transferase level. Cost of production when calculated revealed that supplementation of cysteine-protease and 1, 4-β-xylanase in broiler rations was more profitable than feeding diets without enzymes. The highest gross profit was observed in group T1 receiving standard rations as per ICAR (2013) specifications supplemented with cysteine-protease and 1, 4-β-xylanase. Hence, the study indicated that broilers could be reared more economically and profitably on broiler rations supplemented with cysteine-protease and 1, 4-β-xylanase.