These experiments have not been continued long enough with each feed to suggest infallible conclusions. The work has been carried through two years, however, under excellent conditions for accurate work, and there has been in the fundamental effects of the rations a close similarity of results with the different pairs of horses. While the subject merits more extended study, and future work might give somewhat different results, it seems that the results already obtained justify the following conclusions:
1. The health, spirit, and endurance of work horses were the same when fed corn with a moderate amount of oil meal, or gluten feed, or cottonseed meal; as when fed a corn and oats ration supplying a similar nutritive ratio.
2. The ration of corn and oil meal maintained the weight, flesh, and appearance of the horses fully as well and with less expense than the one of similar nutritive value composed of corn and oats.
Kennedy, W. J.; Robbins, E. T.; and Kildee, H. H.
"The value of corn, oil meal, cottonseed meal, and gluten feed in work horse rations,"
Bulletin: Vol. 9
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol9/iss109/1