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Studies with Swine on Rations Extremely Low in Manganese¹

Arkansas Agricultural Experiment Station

Abstract

Growing pigs throve on a ration containing less than part per million of manganese which produces a high incidence of perosis in chicks. Reproduction on this ration was unsuccessful, but when a green feed supplement ("Cerogras") was added to the ration, which raised the manganese content in the dry feed to 6 ppm., reproduction was satisfactory.

The dried livers of animals on the high manganese rations contained 4 to 15 ppm. of manganese while those of animals on the low manganese ration contained 1 to 6 ppm. The lower figures in each case were found for the older animals. Pigs born to sows on rations containing 100 ppm. of manganese contained 1.29 to 1.42 milligrams of manganese in their bodies. One pig of a litter born to a sow on the ration containing 6 ppm. of manganese contained 0.42 milligram of manganese, the littermates were raised uneventfully. Pigs born to sows on the ration which contained less than ppm. of manganese contained 0.13 to 0.21 mgs. of manganese, and some littermates to these pigs were raised successfully.

¹ Research paper No. 749, Journal Series, University of Arkansas. Published with the approval of the director of the Arkansas Agricultural Experiment Station, Fayetteville, Ark.