Growth performance and endogenous losses of broilers fed XXXX -based diets with and without essential oils and xylanase supplementation.

@entity1568 @entity3167 @entity7655 @entity1573 @entity3505 @entity1386 @entity7654 @entity55818
An experiment was conducted to compare the effect of a supplementary mixture of essential oils, with and without exogenous xylanase, on performance, carcass composition, dietary @entity1568 (N)-corrected apparent metabolizable energy (AMEn), dry matter retention (DMR), N retention (NR), @entity1386 ( @entity1386 ) coefficients, and endogenous @entity55818 losses (measured as @entity3167 , SA) when fed to broiler @entity1573 . Three hundred male Ross 308 broilers in total were reared in floor pens from 0 to 21 d of age. Birds were fed 1 of 3 @entity3505 -based diets: basal diet (215 g/kg CP, 12.12 MJ/kg AME) with either no additive (control diet; C) or 100 g/tonne of a standardized combination of 5% @entity7654 , 3% @entity7655 , and 2% capsicum oleoresin (diet XT); or a combination of XT and commercial xylanase enzyme at a rate of 100 g of XT and 2,000 units (U) of xylanase/kg (diet XYL), respectively. Each diet was randomly allocated to 10 pens with 10 birds. Feeding XT and XYL diets improved birds' growth performance (P<0.05). Birds fed XT and XYL diets had an improved caloric conversion ratio (P<0.05) and consumed 1.3 MJ less AMEn per kilogram of growth compared to birds fed the control diet only. Feeding XT improved only the dietary @entity1386 coefficient (P<0.05) compared to control-fed birds, but the dietary @entity1386 coefficient did not differ for XYL diet (P>0.05). Birds fed XYL diet excreted 35% less endogenous @entity55818 compared to control-fed birds (P<0.05). Birds fed XT alone gained more carcass protein than the control-fed birds (P<0.05) but did not differ from the birds fed XYL diet (P>0.05). There was no indication of a negative interaction between dietary essential oils and xylanase.
