The effects of feeding high concentrations of cholecalciferol, phytase, or their combination on broiler chicks fed various concentrations of nonphytate phosphorus.

摘要

Two experiments were conducted to investigate the effects of feeding high concentrations of cholecalciferol (D₃), phytase, or their combination on BW gain, FE, tibia ash, and total tract P retention in broiler chicks fed various concentrations of nonphytate P (nPP). In the first experiment, we compared dietary nPP concentrations (0.20, 0.26, 0.33, 0.39, and 0.45%) with supplemental D₃ (0, 7,500, and 15,000 IU/kg) for 5- to 23-d-old Ross 308 chicks. In experiment 2, we compared dietary nPP concentrations (0.15, 0.25, 0.35, and 0.45%) with concentrations of D₃ (0 or 7,500 IU/kg) and phytase (0 or 1,000 phytase units/kg) for 4- to 18-d-old Ross 308 chicks. The supplementation of D₃ resulted in improved FE and total tract P retention in experiment 1, but did not have a positive effect on any of the parameters tested in experiment 2. The addition of higher concentrations of D₃ to broiler diets resulted in improved P retention in experiment 1, but did not affect the performance of chicks in either experiment.CAS Registry Numbers 67-97-0 7723-14-0 37288-11-2 9001-89-2