Addition of phytase and other enzyme preparation to low phosphorus – low calcium broiler diets [electronic resouce].

Includes references.

Broiler growth experiment was conducted to evaluate the influence of adding phytase (Ronozyme 2500® granulate) individually or in combination with an enzyme preparation (Avizyme 1500®) containing amylase, protease and xylanase. The experimental diets contained lower levels of Ca and P than the recommended levels. The basal starter diet contained 0.85% Ca and 0.35% non-phytate phosphorus (NPP) while the basal grower diet contained 0.75%Ca and 0.26% NPP. Phytase and / or avizyme were added to the basal diets at levels 500 U phytase and 0.75 g. avizyme /kg diet. Performance, bone parameters and some carcass characteristics were determined at 35 days of age. The results showed that adding phytase or avizyme individually or in combinations to corn soybean meal broiler diets of low Ca and P content significantly (P<0.05) increased body weight gain and feed intake of 35 days old. Such addition did not affect feed gain ratio. Phytase significantly (P<0.05) improved bone parameters (tibia length, weights and ash percentage of tibia and toe). Adding phytase alone or with avizyme significantly (P<0.05) increased Ca % of tibia ash. Tibia P (%) and Zn (mg/kg) were not affected by either phytase or avizyme addition. The dressing and abdominal fat % were significantly (P<0.001) increased with addition of avizyme while addition of phytase did not significantly affect dressing, abdominal fat, liver or heart weights as percentage of body weight.

Summary in Arabic.

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