![]() Diet supplementation with xylanase improved body weight gain and feed conversion ratio in chickens from 1 to 21 days of age. Similarly, no significant effect of increasing dietary level of rye was found for the entire rearing period (1–42 days of age). 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. 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. ![]() All the diets were either unsupplemented or supplemented with xylanase (200 mg/kg of feed with minimum xylanase activity 1000 FXU/g). A 5 × 2 factorial arrangement was employed, with five dietary levels of ground rye (0%, 5%, 10%, 15%, and 20%). 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. In 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.
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