Effects of enzyme addition on the nutritive value of broiler diets containing hulled or dehulled Chinese double-low rapeseed meals.
An in vitro and a feeding trial was conducted to investigate the effect of fibre-degrading enzymes A (xylanase + β-glucanase), B (xylanase) and C (xylanase + cellulase) on the nutritive value of broiler diets containing either hulled (22.5% and 23.5% for 4–21 days and 22–42 days of age, respectively) or dehulled (20% and 21.5%) Chinese double-low rapeseed meals (DLRM). Overall, in vitro digestibility of dry matter (DM) or neutral digestibility fibre (NDF) did not differ (p > 0.05) because of meal types; both crude protein (CP) and NDF digestibility was improved (p < 0.05) because of addition of enzymes B or C either to hulled or dehulled DLRM diets. Birds fed dehulled DLRM diets had a higher (p < 0.05) growth rate, feed efficiency and lower (p < 0.05) feed intake than those fed hulled DLRM diets during the overall phase. Enzyme C addition to dehulled DLRM diets resulted in improved (p < 0.05) growth rate and feed efficiency during 4–21 days of age. Enzymes A and B addition elicited a positive response in feed intake and weight gain (p < 0.05), respectively, but did not affect (p > 0.05) feed efficiency. It would appear that the nutritive value of broiler diets containing Chinese DLRM could be improved by appropriate xylanase-based enzymes. Responses of broilers to fibre-degrading enzymes could be highlighted by hull removal of fed DLRM.
Department of Animal Nutrition, College of Animal Science and Technology, Huazhong Agricultural University, Wuhan, China.
Z F
ZF
Fang
Z L
ZL
Liu
J J
JJ
Dai
H Y
HY
Qian
Z L
ZL
Qi
L B
LB
Ma
J
J
Peng
D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D029741:Brassica rapa / Q000737:chemistry*; D002480:Cellulase / Q000378:metabolism*; D002645:Chickens; D004032:Diet / Q000662:veterinary*; D004063:Digestion; D043364:Endo-1,4-beta Xylanases / Q000378:metabolism*; D006026:Glycoside Hydrolases / Q000378:metabolism*; D008297:Male; D009753:Nutritive Value
D006026:Glycoside Hydrolases; D002480:Cellulase; D043364:Endo-1,4-beta Xylanases