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Calcium and Corn Oil Interrelationships as Influencing Ration Utilization by Lambs¹

Iowa Agricultural and Home Economics Experiment Station, Ames

Abstract

A series of digestibility studies were conducted with lambs to study the effects of corn oil, corn oil saponified with KOH, CaCO₃, corn oil + CaCO₃, starch and starch + CaCO₃ upon digestibility of rations containing corncobs or alfalfa hay. Corn oil or starch decreased digestibility of these components in corncob rations. CaCO₃ increased digestibility of organic matter, protein and cellulose to a greater extent in rations containing corn oil than in controls. Additions of CaCO₃ increased fecal calcium in all instances where this was measured. Calcium tended to increase nitrogen retention. The addition of CaCO₃ increased the calories digested from corn oil or starch additions to corncob rations. Energy from corn oil was not efficiently utilized when the ration contained less than 0.3% calcium. Corn oil or calcium did not appear to alter digestibility of a ration containing alfalfa hay. The energy from corn oil was well digested by lambs when incorporated in the alfalfa hay ration.

¹ Journal Paper No. J-4057 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1208.