Performance of broiler chickens fed low non phytate phosphorus diets supplemented with microbial phytase
2007
Panda, A.K.(Project Directorate on Poultry, Hyderabad (India)) | Rao, S.V.R. | Raju, M.V.L.N. | Gajula, S.S. | Bhanja, S.K.
An experiment was conducted with 270 broiler chicks to examine the effect of microbial phytase supplementation to low non-phytate phosphorus (NPP) diets on growth performance, bone mineralisation and nutrients retention during 1 to 21 days of age. Four isonitrogenous and isocaloric diets were formulated to contain 0.30, 0.35, 0.40 and 0.45% NPP with the two lowest NPP levels (0.30 and 0.35%) supplemented with microbial phytase (500 FTU per kg diet). Each diet was offered ad libitum to 9 replicates of 5 chicks each throughout the experimental period. The performance in terms of body weight gain, feed intake and feed/gain was significantly depressed in chicks fed lowest level of NPP (0.30%). Supplementation of phytase to either 0.30 or 0.35% NPP diet significantly improved body weight gain and feed conversion, which was comparable with 0.40% NPP diet. The leg abnormality increased and, tibia ash and tibia breaking strength decreased significantly in diets containing 0.30 and 0.35% NPP. Increasing NPP level to 0.40% or supplementing 500 FTU phytase/kg diet to 0.30 and 0.35% NPP diets alleviated leg abnormality and enhanced tibia breaking strength and ash content.
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