Biological availability of phosphorus from natural phosphates for bovines by the isotope dilution technique

Authors

  • Henrique Otávio da Silva Lopes
  • Dorinha Miriam Silber Schmidt Vitti
  • Eurípedes Alves Pereira
  • Adibe Luiz Abdala
  • Elino Alves de Moraes
  • José Cleto da Silva Filho
  • Suzete Silveira Fichtner

DOI:

https://doi.org/10.1590/S1678-3921.pab1990.v25.13424

Keywords:

Brachiaria decumbens, dicalcium phosphate, phosphate from Patos, phosphate from Tapira, metabolic cages, basal ration of hay.

Abstract

A metabolism trial was carried out with steers to study the true absorption of phosphorus from dicalcium phosphate and Brazilian rock phosphates from Patos and Tapira. Twenty-seven steers were assigned to three treatment groups in a randomized block design: dicalcium phosphate (DICAL) and natural rock phosphate from Patos de Minas (FP) and Tapira (FT). The animals were confined in metabolic cages and received a basal ration of Brachiaria decumbens hay and a concentrate with the appropiate phosphorus source. The endogenous fecal loss of phosphorus was estimated by the isotope dilution method using 32P as a tracer. The true absorption of phosphorus was 65,88±8,46; 46,21±7,15 and 44,43±9,67% for DICAL, FP and FT, respectively. True phosphorus absorption was higher (P < 0,01) for the streers receiving DICAL than for those fed FP and FT.

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How to Cite

Lopes, H. O. da S., Vitti, D. M. S. S., Pereira, E. A., Abdala, A. L., Moraes, E. A. de, Filho, J. C. da S., & Fichtner, S. S. (2014). Biological availability of phosphorus from natural phosphates for bovines by the isotope dilution technique. Pesquisa Agropecuaria Brasileira, 25(3), 421–425. https://doi.org/10.1590/S1678-3921.pab1990.v25.13424

Issue

v.25, n.3, mar. 1990

Section

ANIMAL SCIENCE