Growth and Economic Performance of Broiler Chickens Fed on Graded Levels of Canola Meal with or without Multi-Enzyme Supplementation

Canola meal (CM) is commonly used in poultry diets; however, its use is limited due to anti-nutritive factors. Therefore, this study was conducted to evaluate the effects of feeding various levels of canola meal (CM) with or without multi-enzyme supplement on broiler chickens. Four levels of CM (0, 5, 10 and 20%) were used with or without multi-enzyme (0 or 300 g/ton of diet) in a factorial design 4 × 2 in 8 dietary combinations. During the experimental period (0-42 d of age), inclusion of CM at a level of 5 and 10% without multi-enzyme and at a level of 20% with or without multi-enzyme decreased body weight gain and gain:feed ratio compared to control (CON; P < 0.05). However, there was no difference in the final body weight at day 42 of age between the groups. No differences were found in carcass characteristics between treatments. Inclusion of CM in broiler diet decreased serum antibody titer at 42 d of age compared to the control and enzyme-supplemented CM groups (P < 0.05). Inclusion of CM with multi-enzyme supplement decreased serum total cholesterol, total triglyceride and glutamate oxaloacetate transaminase compared to CON and enzyme-unsupplemented groups (P < 0.05). Diets supplemented with CM had higher serum creatinine than CON and enzyme-supplemented CM groups (P < 0.05). Lower serum triiodothyronine in broilers fed diet supplemented with 10 or 20% CM was noticed (P < 0.05). CM with multi-enzyme supplementation to broiler ration showed a slight increase in net revenue.

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