The Efficiency of Xylanase in Broiler Chickens Fed with Increasing Dietary Levels of Rye
Anna Arczewska-Włosek , Sylwester Świątkiewicz , Dorota Bederska-Łojewska , Sylwia Orczewska-Dudek , Witold Szczurek , Danuta Boros , Anna Fras , Ewa Tomaszewska , Piotr Dobrowolski , Siemowit Muszyński , Małgorzata Kwiecień , Tomasz Schwarz
AbstractIn this paper, we present a study on the evaluation of the effect of xylanase addition to a diet with an increasing content of modern hybrid rye (Brasetto variety) on the performance indices and viscosity of small intestine content in broiler chickens. A total of 560 1-day-old male Ross 308 chickens were randomly assigned to 1 of 10 treatments, each comprising 7 replicate cages, with 8 male birds per cage. A 5 × 2 factorial arrangement was employed, with five dietary levels of ground rye (0%, 5%, 10%, 15%, and 20%). All the diets were either unsupplemented or supplemented with xylanase (200 mg/kg of feed; with minimum xylanase activity 1000 FXU/g). In the starter rearing period (1–21 days of age), the inclusion of rye (without xylanase supplementation) to the diet, even at the lowest dietary level (5%), negatively affected body weight gain (p < 0.05); there was no effect on feed intake and feed conversion ratio. In older chickens (the grower-finisher rearing period; 22–42 days of age), none of the dietary levels of rye (5–20%) affected growth performance indices. Similarly, no significant effect of increasing dietary level of rye was found for the entire rearing period (1–42 days of age). Diet supplementation with xylanase improved body weight gain and feed conversion ratio in chickens from 1 to 21 days of age. No positive effect of enzyme was found in older birds. No significant effects of the experimental factors used were noticed on the results of slaughter analysis, i.e., the carcass yield, breast meat yield, abdominal fat, and relative weight of the liver and gizzard. A high dietary concentration of rye (20%) increased the viscosity of small intestine content (p < 0.05); however, diet supplementation with xylanase significantly alleviated this effect. The findings of this experiment indicated that modern hybrid rye grain may be used at a 20% dietary level in broiler diets during the second feeding phase, i.e., from 22 to 42 days of age, without any detrimental influence on growth performance indices, while enzyme (xylanase) positively affected body weight gain and feed conversion ratio in younger chicks (1–21 days of age).
|Journal series||Animals, ISSN 2076-2615, e-ISSN 2076-2615, (N/A 100 pkt)|
|Publication size in sheets||0.5|
|Keywords in English||broiler chickens; rye; xylanase; growth performance; viscosity of small intestine content|
|License||Journal (articles only); author's original; ; after publication|
|Publication indicators||= 0; : 2018 = 1.148; : 2018 = 1.832 (2)|
|Finansowanie||This reesarch was supported by the National Centre for Research and Development in Poland and conducted within the Biostrateg program (grant `ENERGYFEED` number: BIOSTRATEG2/297910/12/NCBR/2016)|
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