Efficacy of phytase enzyme produced from Aspergillus niger for improving phosphorus bioavailability in broiler diets
2002
Ahmed, T. (University of Arid Agriculture, Rawalpindi (Pakistan). Dept. of Animal Sciences) | Waheed, A. | Amin, M.
Crude microbial phytase (CMPhy) enzyme was produced from Aspergillus niger, to enhance phytate phosphorus (pP) availability. Maximum phytase activity (1.075 Phytase Units (PU) per ml) was observed in a corn starch based medium after 10 days of fermentation at pH 4.5 and 40 degree centigrade. In vitro CMPhy was most active at pH 2.0 and 5.0, as it resulted in the release of about 79.0% to 88.0% inorganic phosphorus from corn and soybean meal. At 28 days of age, the body weight gain (BWG) of broiler birds fed with phytase supplemented low-P diet was comparable to those fed with normal- P diet without phytase (856 vs 869 g). Addition of CMPhy enzyme to low-P diets increased the availability of P (63.4%) and reduced its excretion by 20.04 % as compared to diet with normal- P contents (43.3%), which reduced the tP and nP requirements by 15 and 20%. Microbial phytase addition to low-P diets, without affecting the performance of the birds, reduced the P excretion in the dropping thus minimizing the P pollution hazards and also helped in utilizing the low cost raw material for increasing P availability.
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