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Effects of Dietary Phosphorus, Soil Ingestion and Dietary Intake Level on Performance, Phosphorus Utilization and Serum and Alimentary Tract Mineral Concentrations in Lambs^1,2,

University of Florida, Gainesville 32611

Abstract

Two experiments were conducted with lambs fed concentrate-based diets to study the effects of dietary P and soil ingestion on performance, P utilization and mineral composition of serum and alimentary tract contents. In Exp. 1, 20 wether lambs were fed diets for 21 d in a 2 x 2 factorial arrangement of treatments with .2 or .3% total dietary P and 0 or 9% added Florida Ultisol (highly weathered soil with high P-fixation capacity) containing 4,600 and 6,400 mg/kg total Al and Fe, respectively. True P absorption increased (P < .05) from 30 to 42% and from 37 to 54% when soil was added to die basal and high P diets, respectively. In Exp. 2, 24 wether lambs were assigned randomly to a 2 x 2 x 2 factorial arrangement of treatments. Lambs were fed during a 70-d period using diets described previously on either a restricted or an ad libitum basis. Soil increased Fe concentration in ruminal fluid (P < .05) and ash percentage (P < .001) in ruminal solids and feces. Aluminum concentration in ruminal solids and feces and Fe in ruminal solids were increased (P < .001) by soil addition, whereas concentrations of Ca, Mg, P, Zn, Cu and Mn in ruminal solids and feces were decreased (P < .01) by soil addition. There were time x P interactions on serum inorganic P (P < .01) and Mg (P < .05) concentrations. Although high in P-fixing capacity, soil fed to lambs in these experiments improved P utilization. Lambs appeared to be able to adapt to changes in intake of dietary minerals in soil, possibly through adaptation of ruminal microflora or a redistribution of body mineral pools.

¹ Florida Agric. Exp. Sta., journal ser. no. 8381.

² The authors wish to acknowledge Moorman Manufacturing Co., Quincy, IL, Pitman-Moore Inc., Mundelein, IL, and Occidental Chemical Co., Tampa, FL for funds in support of this research; Pfizer Co., New York for supplying vitamins A and D and Monsanto Chemical Co., St. Louis, MO for supplying ethoxyquin.

³ Present address: Centro de Ganaderia, Colegio de Postgraduados, Chapingo, Mexico 56230, Mexico.

⁴ Dept. of Anim. Sci.

⁵ Dept. of Statistics.

⁶ Dept. of Soil Sci.