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Influence of feed ingredients with pellet binding property on physical pellet quality, growth performance, carcass characteristics and nutrient retention in broiler chickens
The influence of pellet binder inclusion on physical pellet quality, growth performance, carcass characteristics and total tract apparent retention of nutrients (TTAR) was examined. Broiler starter (days 1-21, pellet diameter: 2.5 mm) and finisher (days 22-42, pellet diameter: 4 mm) diets were formulated and then allocated to one of the seven treatments including control diet, sodium bentonite (10 and 20 g/kg), wheat gluten (10 and 20 g/kg) and wheat (100 and 200 g/kg) inclusion. All ingredients used as a pellet binder significantly increased (P<0.05) pellet durability index (PDI) compared to control diet. Wheat gluten and wheat at either inclusion rates were more (P<0.05) efficient than sodium bentonite in improving pellet hardness. Form d1 to 42, chickens fed 10 g/kg wheat gluten and 100 and 200 g/kg wheat gained significantly more (P<0.05) weight than control. During starters, birds fed 200 g/kg wheat showed highest (P<0.05) feed intake. On d 42, all the pellet binders resulted in heavier heart weight than control (P<0.05). At 21 d, length of ileum was higher (P<0.05) in birds fed 10 and 20g/kg sodium bentonite, 10g/kg wheat gluten and 200g/kg wheat, but at 42 d, it was greater in birds fed 20g/kg wheat gluten and 200g/kg wheat than those fed control. Inclusion of wheat gluten (10 and 20 g/kg) and wheat (100 and 200 g/kg) increased (P<0.05) fat apparent retention. Birds fed 20g/kg wheat gluten had significantly higher TTAR of crude fiber (P<0.05), also Ca apparent retention improved by wheat gluten inclusion at levels of 10 and 20 g/kg compared with control (P<0.05). Overall, inclusion of 10 g/kg wheat gluten, and 100 and 200 g/kg of wheat improved physical pellet quality, while increased weight gain in broilers fed pelleted diets.
AN17109 Accepted 16 August 2017
© CSIRO 2017