عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This experiment was designed to evaluate the effects of different levels of full fat canola seed (either with or without any enzyme addition) on broiler productivity. Four hundred and thirty two male broilers were employed in a completely randomized design of 2×6 factorial arrangement involving 2 levels of enzyme (either with or without), and 6 levels of canola seed (0, 5, 10, 15, 20, 25%). Experimental diets were fed in the grower (14-21) and finisher (21- 42) periods. The results indicated that by inclusion of 5% of canola seed (with and without enzyme), weight gain and FCR were more appropriate than the other levels of canola seed (P<0.05) without any significant difference with control. Increased level of canola seed caused decrease in feed intake (P<0.05). Higher levels of canola seed (25%) caused the decreased percentage of carcass and abdominal fat as well as higher liver weight, but did not exert any significant effects on gastrointestinal tract. Effects of canola seed levels at 26 days of age on T3, AST and creatinine were significant(P<0.05), but at 42 days of age no significant effect was observed (except for creatinine), indicating decreased anti- nutritive effects of canola seed by age. The added enzyme did not improve the performance parameters. In conclusion, the results indicate, that up to 5% of canola seed could be added to broiler rations without any need for enzyme addition.