Vitamin and Mineral Supplements for Growing and Fattening Pigs in Drylot

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Abstract
Additions of a combination of Co, Cu, Fe, and Mn to a drylot swine ration composed of feeds of plant origin resulted in an increase in rate and efficiency of gain. These trace minerals produced gains as rapid as those obtained when 10% of an animal protein was fed. Allowing the pigs access to fresh cow manure or sod and dirt enabled pigs fed the plant protein ration to gain as rapidly as those fed the trace mineral supplements. Additions of a combination of trace minerals, crude aureomycin, and vitamin B12 resulted in more efficient and slightly more rapid gains than trace minerals alone. A combination of trace minerals, crude streptomycin, and vitamin B12 produced no more rapid gains than the trace minerals alone. The combination of trace minerals enhanced intestinal synthesis of vitamin B12.

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