Some 11 or 12 million slaughter hogs are produced on Iowa farms each year. The sale of these hogs produces the largest single item (about 40 percent) of the annual farm income of the state. Any procedure that will produce these hogs more efficiently will increase the net income o f the farmer who uses it, as well as that of the state as a whole.
Lush, J. L.; Shearer, P. S.; and Culbertson, C. C.
"Crossbreeding hogs for pork production,"
Bulletin: Vol. 34
, Article 1.
Available at: https://lib.dr.iastate.edu/bulletin/vol34/iss380/1