In the first experiment, seventy-five one-old commercial chicks were divided into two group with twenty and fifty-five chicks randomly, fed diets with 0.4% and 0.11% available P, respectively. During the thirty-day experiment, the sternum bending incidence rat was 52% in low-P group. The gain weight was decreased in low-P group(P<0.05). It show that the chicks have the phosphorus deficiency. In the second experiment, fourty-eight falling ill chicks were divided into four groups randomly, fed diets with 0.1...
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