Making cottonseed meal safe and effective when fed as the only protein concentrate to pigs in dry lot.
W. L. Robison Ohio Agricultural Experiment Station
At the Ohio Experiment Station 8 tests have been conducted in which cottonseed meal has been fed with yellow corn, ground alfalfa, and minerals to growing and fattening pigs that were kept indoors. Thirty-three out of 72 head in the 8 tests, or 46 per cent, died. Except in one trial in which there were no deaths, the mortality ranged from 37.5 to 75 per cent.
In two of the 8 experiments, 8 out of 18 pigs fed cottonseed meal as a supplement died; whereas there were no deaths among an equal number similarly fed except that the cottonseed meal for them was moistened, placed in shallow trays, and autoclaved at 14 pounds pressure for one hour. From studies made with rats, Gallup (1) reported cottonseed meal to have a lower digestibility after autoclaving than before. Autoclaving cottonseed meal on a commercial basis at the time of its manufacture would doubtless materially increase the cost of production.
A good natural fertilizer with an acid pH. Analysis will vary and ranges from 6-2-1 to 7-2-2 with trace elements. Does have an odor, but is a good organic source of nitrogen.