The Department of Animal Husbandry has recently received a number of
requests for information on the need of salt for fattening pigs when the
ration was corn and tankage with alfalfa hay or pasture. The answer to these
inquiries has always been that pigs did not need salt when they received
tankage or some similar protein supplement of animal origin; but if most of
the protein supplement was of plant origin as soybean meal, cottonseed meal,
alfalfa meal, or linseed meal, salt was advisable.