ABSTRACT
The objective of the present study was to evaluate the reduction of calcium (Ca), crude protein (CP), metabolizable energy (ME), and available phosphorus (aP) in the nutritional matrix of Brazilian commercial broiler diets supplemented with both phytase superdosing (1500 FTU/kg) or conventional doses (500 FTU/kg) on the feed cost and profitability, performance, bone mineralization, and carcass yield of broiler from 1 to 42 d. A total 1200 one-day-old chicks (Cobb 500) were randomly distributed in a commercial feeding program composed of a positive control diet and three diets with reduction of Ca, aP, CP, and ME in the nutritional matrix supplemented with 500, 1000, and 1500 FTU/kg of phytase. The broilers subjected to diets with phytase superdosing presented similar performance, bone ash, and carcass yield, among the treatments. There was a linear effect in the total nutrition cost, gross margin, and estimated net margin per bird with the increase of dietary inclusion of phytase in all purposed scenarios. Thus, for each 500 FTU/kg of dietary phytase included in the diet with reduction of Ca, P, ME, and CP in the nutritional matrix, the total nutrition cost decreased R$ 0.072/bird, R$ 0.079/bird, and R$ 0.081/bird in scenarios of high, medium, and low prices of corn and soybean meal, respectively, that allowed an increase in the estimated net margin of R$ 0.20/bird, R$ 0.22/bird, and R$ 0.22/bird in the same scenarios.
gross margin; net margin; nutritional value; production cost
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ME - metabolizable energy; CP - crude protein; aP - available phosphorus.Commercial dollar = R$ 3.28.Values based on total average intake/bird.Reduction in dietary treatments:1 to 21 d: 500 = ME, 23 kcal; CP, 0.23%; Ca, 0.10%; aP, 0.09%; 1000 = ME, 29 kcal; CP, 0.29%; Ca, 0.13%; aP, 0.12%; 1500 = ME, 34 kcal; CP, 0.34%; Ca, 0.15%; aP, 0.14%.22 to 42 d: 500 = ME, 23 kcal; CP, 0.24%; Ca, 0.11%; aP, 0.10%; 1000 = ME, 30 kcal; CP, 0.31%; Ca, 0.14%; aP, 0.13%; 1500 = ME, 35 kcal; CP, 0.36%; Ca, 0.16%; aP, 0.15%.