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Interrelationship of Dietary Phosphorus, Aluminum and Iron on Performance and Tissue Mineral Composition in Lambs^{1 ,2,}

University of Florida⁴, Gainesville 32611

Abstract

A 76-d feeding trial was conducted with 24 wether lambs (31 kg, initially) to study the interrelationships among dietary P, Al and Fe. A 2 x 2 x 2 factorial arrangement of treatments included two concentrations of supplemental P (0 or .25%) with added P as NaH₂PO₄, two levels of supplemental Fe (0 or 760 ppm) with Fe added as ferric citrate and two levels of supplemental Al (0 or 1,450 ppm) with Al added as AlCl₃• 6H₂O. The basal diet contained .17% P, 40 ppm Fe and 168 ppm Al. Phosphorus increased (P<.01) feed consumption, but Fe (P<.01) and Al (P<.05) decreased intake. Dietary treatments affected average daily gain (P<.01), with added P improving and Fe or Al depressing gain. Additional P improved gain (P<.05) and intake (P<.01) in the presence of high Al and intake (P<.05) when dietary Fe was high. Serum P was increased (P<.01) by high dietary Fe and reduced (P<.01) by Al. High dietary P increased (P<.05) serum Mg. High dietary Fe increased (P<.01) hemoglobin and hematocrit and increased (P<.01) Fe storage in liver, kidney, spleen and muscle but decreased (P<.01) kidney Zn concentration. High dietary Al increased (P<.01) liver Fe and kidney Zn levels but decreased kidney P and Mg (P<.05) and bone ash and Mg (P<.01). Based on these studies, additional dietary P appeared beneficial in overcoming the adverse effects of high dietary Al or Fe.

¹ Florida Agr. Exp. Sta. Journal Ser. No. 3210.

² The authors acknowledge International Minerals and Chemical Corp., Mundelein, IL; Moorman Manufacturing Co., Quincy, IL, and Occidental Chemical Co., Houston, TX for funds in support of this research, and Pfizer, Inc., New York, NY for supplying vitamins A and D.

³ Scholarship provided by Empresa Brasileira de Pesquisa Agropecuaria, Brasil. Present address: CNPGC/EMBRAPA 79100 Campo Grande, MS. Brasil.

⁴ Dept. of Anim. Sci.