Ear corn and shelled corn proved more efficient than ground ear corn or corn meal for wintering brood sows. This was the result obtained where four groups of 10 sows each received salt (self-fed), and three-fifths of a pound per head daily of a mixture of linseed oilmeal, tankage and wheat middlings, in addition to one of the following: ear corn, shelled corn, corn and cob meal, or ground corn.
The differences in gains from the various kinds of corn preparation were not great. Hence, the objection to grinding the corn lies in the cost. Ground shelled corn proved especially costly.
Evvard, John M.; Wallace, Q. W.; and Culbertson, C. C.
"Preparation of corn for yearling brood sows,"
Bulletin (Iowa Agricultural Experiment Station): Vol. 21
, Article 1.
Available at: http://lib.dr.iastate.edu/bulletin/vol21/iss245/1