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Influence of adding phytase to low calcium broiler diets on performance, bone and carcass characteristics [electronic resouce].

By:

El-Sherbiny, A. E

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Language: English Summary language: Arabic Description: p.653-668Other title:

تأثير اضافة انزيم الفايتيز الي العلائق بداري اللحم المغذاة علي مستويات منخفضة من الكالسيوم علي الاداء الانتاجي والعظام وصفات الذبيحة [Added title page title]

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Egyptian poultry science journal, 2005 v. 25 (III) [electronic resouce].

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In: Egyptian poultry science journal 2005.v.25(III)Summary: Three starter diets contained 1.00, 0.85 and 0.65% Ca, and three corresponding grower diets contained 0.90, 0.75, and 0.55 % Ca were formulated. The nonphytate-P (NPP) content was 0.35% for the starter and 0.26% for the grower diets. Phytase enzyme was added to all diets at two levels, being 0 and 500 U/kg diet. The dietary treatments were fed to 180 oneday old Ross broiler chicks for 35 days. Every dietary treatment was applied to 3 replicates of 10 chicks each (6 treatments x 3 replicate x 10 chicks).Growth performance, bone parameters and some carcass characteristics were measured. The results showed that, decreasing dietary Ca level increased (P<0.05) body weight, slightly decreased feed intake and significantly (P<0.05) improved feed conversion ratio. Addition of phytase to different dietary Ca levels increased (P<0.001) weight gain, feed intake (P<0.05) and improved (P<0.05) feed conversion ratio. Birds fed 0.85/0.75 or 0.65/0.55% Ca (starter/grower) diet with phytase addition recorded the highest weight gain and the best feed conversion ratio compared to those fed 1.00/0.90% Ca diet. Decreasing dietary Ca level did not affect tibia length or bone weight but it did increase tibia and toe ash% significantly (P<0.01). Phytase supplementation increased (P<0.01) average tibia length, tibia and toe weights and also increased ash % of tibia and toe (P<0.001). Decreasing dietary Ca level and phytase supplementation significantly increased concentrations of Ca, P% (P<0.001) and Zn mg/Kg (P<0.01) in tibia ash. Decreasing dietary Ca level or added phytase enzyme did not significantly affect carcass weight, dressing % or heart weight (% body weight). Decreasing dietary Ca level significantly decreased abdominal fat, gizzard (P<0.001) and liver (P<0.01) percentages. Addition of phytase significantly (P<0.01) decreased abdominal fat %. In conclusion, Addition of phytase enzyme to broiler diets of low Ca content significantly improve body weight gain, feed intake and feed conversion ratio. It also improved bone mineralization.

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Three starter diets contained 1.00, 0.85 and 0.65% Ca, and three corresponding grower diets contained 0.90, 0.75, and 0.55 % Ca were formulated. The nonphytate-P (NPP) content was 0.35% for the starter and 0.26% for the grower diets. Phytase enzyme was added to all diets at two levels, being 0 and 500 U/kg diet. The dietary treatments were fed to 180 oneday old Ross broiler chicks for 35 days. Every dietary treatment was applied to 3 replicates of 10 chicks each (6 treatments x 3 replicate x 10 chicks).Growth performance, bone parameters and some carcass characteristics were measured. The results showed that, decreasing dietary Ca level increased (P<0.05) body weight, slightly decreased feed intake and significantly (P<0.05) improved feed conversion ratio. Addition of phytase to different dietary Ca levels increased (P<0.001) weight gain, feed intake (P<0.05) and improved (P<0.05) feed conversion ratio. Birds fed 0.85/0.75 or 0.65/0.55% Ca (starter/grower) diet with phytase addition recorded the highest weight gain and the best feed conversion ratio compared to those fed 1.00/0.90% Ca diet. Decreasing dietary Ca level did not affect tibia length or bone weight but it did increase tibia and toe ash% significantly (P<0.01). Phytase supplementation increased (P<0.01) average tibia length, tibia and toe weights and also increased ash % of tibia and toe (P<0.001). Decreasing dietary Ca level and phytase supplementation significantly increased concentrations of Ca, P% (P<0.001) and Zn mg/Kg (P<0.01) in tibia ash. Decreasing dietary Ca level or added phytase enzyme did not significantly affect carcass weight, dressing % or heart weight (% body weight). Decreasing dietary Ca level significantly decreased abdominal fat, gizzard (P<0.001) and liver (P<0.01) percentages. Addition of phytase significantly (P<0.01) decreased abdominal fat %. In conclusion, Addition of phytase enzyme to broiler diets of low Ca content significantly improve body weight gain, feed intake and feed conversion ratio. It also improved bone mineralization.

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