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Keywords
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digestibility, enzyme, morphology, viscosity, vitamin A, wheat
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Abstract
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The effect of wheat-based diet (WBD), supplemented with xylanase and surplus vitamin A, on
performance, nutrient digestibility, intestinal morphology and digesta viscosity of broiler chickens was
investigated. Based on a completely randomized design, 240-day-old chickens were randomly divided into six
experimental diets and four replications with 10 chickens each. Experimental diets consisted of corn-based diet
(CBD) (T1), WBD with routine amounts of vitamin A (9000 IU kg-1) (T2), T2 without vitamin A in premix
(T3), T2 + 6000 IU kg-1 vitamin A (T4), T2 + 420 IU kg-1 xylanase (T5), and T2 + 6000 IU kg-1 vitamin
A + 420 IU kg-1 xylanase (T6). For Feed Conversion Rate (FCR) between day 1 and 21 and between day 21 and
42 WBD supplemented with vitamin A and enzyme was less than CBD (p < 0.05). Also, supplementation of
surplus vitamin A singly, and vitamin A and enzyme improved digestibility of crude protein (CPD) and crude fat
(CFD) than WBD with routine amounts of vitamin A (p < 0.05). The villus (duodenum, jejunum and ileum)
was longer (p < 0.05) in broilers fed on diet supplemented with vitamin A and enzyme than those with CBD. It
may be concluded that enzyme and vitamin A supplementation to WBD may improve mentioned parameters
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