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Effects of High Dietary Manganese as Manganese Oxide or Manganese Carbonate in Sheep^1,2,

University of Florida⁴, Gainesville 32611

Abstract

Twenty-four crossbred Florida native wether lambs, 28 kg initially, were assigned randomly to a basal diet (31 ppm Mn dry matter basis) supplemented with either 0, 500, 1,000, 2,000 or 4,000 ppm Mn from feed grade MnO or 2,000, 4,000 or 8,000 ppm Mn from reagent grade MnCO₃. There were three sheep/treatment, with ad libitum access to feed and tap water. After 84 d, all animals were slaughtered and tissues removed for analysis. Dietary Mn at the highest levels from either source reduced (P<.05) average daily feed intake and average daily gain. Hemoglobin and hematocrit were not affected by dietary Mn. Manganese concentration in kidney, spleen, heart, skeletal muscle, bone, serum (P<.01) and liver (P<.05) increased as dietary Mn increased. Kidney P was reduced (P<.05) as dietary Mn increased; however, no other tissue minerals were affected. At comparable levels of supplementation, sheep fed feed-grade MnO exhibited numerically greater tissue Mn concentration than did those fed reagent-grade MnCO₃ and regression analysis indicated higher rates of tissue uptake in MnO-supplemented sheep. Reduced feed intake and gain and apparent Mn homeostatic failure in liver were the only observed effects that may have been related to Mn toxicosis.

¹ Florida Agr. Exp. Sta. Journal Ser. No. 5584.

² The authors wish to acknowledge Southeastern Minerals Inc., Bainbridge, GA; International Minerals and Chemical Co., Mundelein, IL; Moorman Manufacturing Co., Quincy, IL and Occidental Chemical Co., Houston, TX for funds in support of this research; Pfizer Co., New York for supplying vitamins A and D; Monsanto Chemical Co., St. Louis, MO for supplying ethoxyquin and Agricultural Operations, Minerals Division, International Minerals and Chemical Corp., Bartow, FL for X-ray diffraction analysis of Mn sources.

³ Present address: Central Soya Co., 1200 No. 2nd St., Decatur, IN 46733.

⁴ Dept. of Anim. Sci.

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