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Nutrient absorption in lambs fed diets containing different amounts of phosphorus

Nutrient absorption in lambs fed diets containing different amounts of phosphorus



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Patiño P, R., Soares da Silva, T., da Silva Filho, J. C., Nasser, M. E., Smith Vitti, D., & Moreira, J. A. (2013). Nutrient absorption in lambs fed diets containing different amounts of phosphorus. Revista MVZ Córdoba, 18(2), 3444-3451. https://doi.org/10.21897/rmvz.166

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PlumX
René Patiño P
Tanimara Soares da Silva
José C. da Silva Filho
Mohamed Emad Nasser
Dorinha Smith Vitti
José A. Moreira

ABSTRACT

Objective. Evaluate the effect of increasing P intake on nutrient digestibility, and compare the true and apparent absorption coefficients of P and Ca in lambs. Materials and methods. Twenty-four Santa Ines sheep, with an average weight of 33.6 ± 1.6 kg, were distributed into four treatments (0, 2, 4 and 6 g/day of supplementary P) with forage: concentrate ratio of 70:30. The study of apparent nutrient digestibility was conducted during the first week, using the total feces collection method. During the second week, after injection of 7.4 MBq of 32P and 7.7 MBq of 45Ca, apparent (AAC) and true (TAC) absorption coefficients of P and Ca were determined. The lambs were kept in metabolic cages. Results. The increase in P intake did not affect (p>0.05) dry matter, crude protein, NDF or ADF digestibility, but the TAC of P and Ca and mineral matter digestibility decreased. The AAC was not affected (p=0.10). A cubic relationship was observed between P intake and TAC (TAC=2.16–1.95X+0.55X2-0.04X3; R2=0.38) and linear relationship with the TAC of Ca (TAC=0.559–0.03X; R2=0.26). TAC and AAC values were different (p<0.001). Conclusions. The increase in P intake doesn’t impact organic matter digestibility, but does affect P and Ca absorption. Apparent digestibility is not a reliable parameter to determine the efficiency of P and Ca absorption.


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