Abstract
Two experiments were conducted to evaluate phytase addition to sorghun grain-,soybean meal-,corn gluten diets for broilers of 1 to 21 d of age. In experiment 1 the available phosphorus (AvP) levels of 0.12, 0.25, 0.35 and 0.45 %, with and whithout phytase (600 FTU / kg) were used. There was higher weight gain (P<0.05) with 0.12 % AvP plus phytase (131 vs 285 g). Feed intake was reduced as dietary AvP was reduced to less of 0.12 %. Ash increased with phytase addition. The highest mortality (56.8 %) was observed with 0.12 % AvP and reduced (to 7.15 %) with phytase supplementation. In experiment 2, two AvP levels (0.08 and 0.39 %) and two levels of phytase (0 and 600 FTU per kg of feed) were evaluated. There was an improvement of weight gain and feed intake only at the low level of available phosphorus (137 vs 240 g) and (240 vs 420 g) respectively. Mortality was reduced with both levels of phytase. Excreted phosphorus levels was higher with highest levels of phosphorus, with or without phytase. It was concluded, that weight gain is higher with phytase supplementation in low-phosphorus diets.
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