Infulence of microbial phytase and energy levels on broiler performance fed low-phosphorus diets
Abstract: An experiment was conducted to investigate the influence of two levels of microbial phytase (0 and 750 FTU/kg diet), three different energy levels (2800 ,3000 and 3200 kcal ME/kg diet) and two dietary phosphorus sources (bone meal, BM and di-calcium phosphate,DCP).
The level of Ca in low-nonphytate phosphorus (npp) diets with phytase (750 FTU/kg diet) was 0.6 %. A total number of 360 unsexed one-day old Arbor Acres broiler chicks were equally distributed into 12 treatments of 30 chicks each, in three replicate (10 chicks each). Diets were formulated to contain 23 % CP (starter) and 20 % CP (grower).
Results obtained are as follows:
Phytase supplementation to low-nPP diets improved growth performance, digestion coefficients of CP, EE, NB and AME, economic efficiency, increased plasma P level (P<0.01), tibia ash, bone P (P<0.05) and Ca (P<0.01) percentage and P and Mg retention as compared to those fed normal-nPP diets without phytase. Diets formulated based on recommended energy level (3200 kcal ME/kg) significantly increased live body weight gain, digestion coefficients of EE and AME and abdominal fat percentage compared to other dietary energy levels. However, dietary energy levels had no significant effect on plasma minerals, tibia weight, tibia ash and minerals retention. No significant effect on growth performance, carcass characteristics, plasma minerals, tibia weight, ash, minerals retention and digestion coefficients between diets containing BM and that containing DCP.
Generally, either phytase supplementation of a 10w-nPP diet or recommended energy level (3200 kcal ME/kg diet) improved growth performance.
Publication year 2005
Availability location معهد بحوث الانتاج الحيوانى- شارع نادى الصيد- الدقى - الجيزة
Availability number
Organization Name
City الغردقة
serial title 3rd international Poultry conference 4-7 Apr. 2005 Hurghada- Egypt.
Author(s) from ARC
External authors (outside ARC)
    اسامة الحسينى جامعة القاهرة
Agris Categories Animal feeding
AGROVOC
TERMS		 Broiler chickens. Performance testing. Phosphorus. Phytase. Trophic levels.
Publication Type Conference/Workshop
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