Effect of Various Toasting Conditions of Full Fat Soybean on Nutritive Value and Growth Performance in Broiler Chickens
Effect of Various Toasting Conditions of Full Fat Soybean on Nutritive Value and Growth Performance in Broiler Chickens
M. Mansoor Javed*, M. Aslam Mirza, M. Aziz ur Rehman and M. Saif ur Rahman
ABSTRACT
This experiment was conducted to check the effect of various processing conditions on the nutritive value of full-fat soybean (FFSB), apparent metabolizable energy (AME), nitrogen retention and growth in broiler chickens. Full-fat soybean was prepared by subjecting dehulled soybean to different temperatures i.e. 90°C, 100°C and 110°C for various resident tines i.e., 15 min, 30 min and 45 min in a multitier commercial toaster. Each product was analyzed for proximate composition, pepsin digestibility, KOH solubility and urease activity prior to inclusion in the experimental diets. A day old Cobb-500 broiler birds (n=432) were purchased commercially. Nine iso-caloric as well as iso-nitrogenous experimental formulations as starter diets (CP 22 %, ME 3000 Kcal/kg), grower diets (CP 20.5 %, ME 3075 Kcal/kg) and finisher diets (CP 19 %, ME 3150 Kcal/kg) were formed as per nutritional recommendations for Cobb-500 and assigned to 36 replicates (four replicates/treatment) employing 3×3 factorial arrangement under the completely randomized design. Each replicate had 12 birds. The trial lasted for 35 days. No effect of toasting temperature and resident time (P>0.05) was noted on feed intake during starter phase (day 1-10). Body weight gain and feed conversion ratio (FCR) were significantly (P<0.05) positively affected in response to diets having FFSB processed at 90°C for 45 minutes. Processing FFSB at 90°C for 15 minutes resulted in lowest weight gain, while poor FCR was observed in the birds fed FFSB processed at 110°C for 45 minutes. Extending the toasting time from 15 to 45 min improved FCR at 90°C. The AME and AMEn values were non-significant (P>0.05) across dietary treatments. Similar trend was observed for digestibility of ether extract (P>0.05). Nitrogen retention was higher (P<0.05) in the birds fed on diets having FFSB processed at 90°C for 45 min. Pancreatic hypertrophy was observed histologically in birds having feed formulations with FFSB processed at lowest temperature for shortest time duration. It was inferred that toasting FFSB at various temperatures could affect growth performance and digestibility parameters in broiler chickens.
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