After hybrid corn became popular many farmers decided that some varieties were too hard to feed successfully to beef cattle. At the Iowa Station we boiled the problem down to hard corn vs. soft corn- instead of hybrid vs. open-pollinated- and found in our first year's test that soft corn is superior for cattle feeding.
Culbertson, C. C.
"Corn Can Be Too Hard,"
Farm Science Reporter: Vol. 1
, Article 4.
Available at: https://lib.dr.iastate.edu/farmsciencereporter/vol1/iss3/4