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Non-phytate phosphorus requirement for broilers from 8 to 21 days of age under heat stress conditions

Abstract

Two trials were conducted to determine the non-phytate phosphorus (nPP) requirement for broiler under heat stress. In both trials, birds were distributed in a completely randomized 4 × 2 factorial design with four nPP concentrations: 0.25, 0.35, 0.45, and 0.55%, and two Ca supply techniques: Ca fixed at 0.899% (CaF) or varying along with nPP aiming a 2:1 Ca to nPP ratio (CaV). Both trials had eight pens/treatment, with nine and five birds/pen for exp. 1 and exp. 2, respectively. nPP concentration had no effect on feed intake (FI), body weight gain (BWG), feed conversion ratio (FCR), nor fat deposition ratio (FDR). nPP levels showed a linear effect on protein deposition ratio (PDR) only for CaF diets. The nPP levels had a significant effect, regardless the technique adopted, on tibia phosphorus (TibP), which varied quadratically, on tibia calcium (TibCa) that increased quadratically and linearly, respectively, on CaF and CaV diets, and on tibia ash (TibAsh) that showed a quadratic effect for both. No effect was observed on Ca to P ratio in the tibia (TibCa:TibP). The nPP levels showed a linear increase effect over phosphorus intake (PI), phosphorus excreted (PE), and phosphorus retained (PR), and a linear decrease effect on phosphorus retention coefficient (PRC). Therefore, the nPP requirement for broilers from 8 to 21 days of age that provided better performance and bone variables were 0.250 and 0.484%, respectively, for CaF diets and 0.250 and 0.511%, respectively, for CaV diets.

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Acknowledgments

The authors acknowledge FAPEMIG (Fundação de Amparo à Pesquisa do Estado de Minas Gerais) for the support and incentive for scientific research, making this study possible.

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Correspondence to Evandro Ferreira Cardoso.

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The authors declare that they have no conflicts of interest.

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Cardoso, E.F., Donzele, J.L., de Oliveira Donzele, R.F.M. et al. Non-phytate phosphorus requirement for broilers from 8 to 21 days of age under heat stress conditions. Trop Anim Health Prod 50, 317–325 (2018). https://doi.org/10.1007/s11250-017-1434-1

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Keywords

  • Bone mineralization
  • Ca to nPP ratio
  • Heat stress
  • Mineral excretion
  • Thermal environment