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Influence of Ingestion of Aluminum, Citric Acid and Soil on Mineral Metabolism of Lactating Beef Cows¹

Virginia Polytechnic Institute and State University, Blacksburg 24061 and U.S. Department of Agriculture, El Reno, OK 73036

Abstract

Lactating beef cows (16 Hereford and 34 Angus, 430 kg average body weight, aged 8 to 10 yr) were fed a basal diet containing 200 µg/g Al alone or supplemented with Al-citrate, citric acid, soil or soil plus citric acid for 56 d. Diets containing Al-citrate, soil and soil plus citric acid contained 1,730, 1,870 and 1,935 µg/g Al. dry-basis, respectively. Adding soil to the diet also increased Mg and Fe content of the diet. Aluminum values in ruminal contents of beef cows fed the basal alone or supplemented with citric acid, Al-citrate, soil or soil plus citric acid were 800, 990, 2,930, 3,410 and 2,910 µg/g, air-dry basis, respectively. Serum Mg and inorganic P declined (P<01) and urinary Ca concentration increased (P<.01) for cows fed Al-citrate. By d 56, serum Mg was 1.5 and 2.2 mg/dl, and serum P was 3.8 and 6.8 mg/dl, for cows fed Al-citrate and basal diets, respectively. Calcium concentrations in urine were 281 and 11 µg/g for cows fed Al-citrate and basal diets, respectively. Citric acid, soil and soil plus citric acid had no detrimental effects on serum Mg and inorganic P, or urinary Ca concentration. By d 56, serum Ca was higher (P<.06) in cows fed Al-citrate, compared with cows on the other four diets. Bone Ca, P, Zn and percent ash were not significantly affected by treatment but bone Mg tended to be slightly lower (P<.07) for cows fed Al-citrate. Results indicate that Al ingestion can alter Mg, Ca and P metabolism in lactating beef cows, but the effect depends on the Al source.

¹ Supported in part by a grant from the John Lee Pratt Anim. Nutr. Program.

² Dept. of Agron., Virginia Polytechnic Inst. and State Univ.

³ Livestock and Forage Res. Lab., USDA-ARS P.O. Box 1199, El Reno, OK 73036.

⁴ Present address: ARS-USDA, Suite A. 220 Second St., South Minneapolis, MN 55401.

⁵ Dept. of Anim. Sci., Virginia Polytechnic Inst. and State Univ.