Nutritional cost reduction and increase profitability in commercial broiler production using phytase superdosing

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.摘要 本研究旨在评估：在巴西商品肉鸡日粮的营养矩阵中，分别添加超剂量植酸酶（phytase，1500 FTU/kg）与常规剂量植酸酶（500 FTU/kg）时，降低钙（Ca）、粗蛋白（CP）、代谢能（ME）与有效磷（aP）的日粮方案，对1~42日龄肉鸡的饲料成本、养殖收益、生产性能、骨骼矿化程度以及屠宰率的影响。本试验共选取1200只1日龄科宝500（Cobb 500）肉鸡，随机分为4组，分别饲喂基础正对照日粮，以及3种在营养矩阵中降低Ca、aP、CP与ME，并分别添加500、1000、1500 FTU/kg植酸酶的试验日粮，全程采用商业化饲喂方案。结果表明，饲喂超剂量植酸酶日粮的肉鸡，其生产性能、骨灰分含量与屠宰率在各处理组间无显著差异。在所有预设场景中，随着日粮中植酸酶添加量的提升，每只肉鸡的总营养成本、毛利润与估算净利润均呈现线性变化趋势。因此，在营养矩阵中降低Ca、P、ME与CP的日粮中，每额外添加500 FTU/kg植酸酶时，在玉米与豆粕价格分别为高、中、低的场景下，每只肉鸡的总营养成本分别降低R$0.072、R$0.079与R$0.081，对应估算净利润分别提升R$0.20、R$0.22与R$0.22。