The excellent feeding properties of good quality legume hay and certain vegetable oil meals have long been recognized by the livestock producer. The observed feeding values of these feedstuffs cannot be attributed entirely to their classical nutrient compositions. It has been long suspected that they contain unidentified .factors that are stimulatory to growth.
Proceedings of the Iowa Academy of Science
©1957 Iowa Academy of Science, Inc.
Story, C. D.; Hale, W. H.; Cheng, E. W.; and Burroughs, Wise
"The Effect of Low Levels of Diethylstilbestrol and Plant Estrogens Upon Performance of Fattening Lambs,"
Proceedings of the Iowa Academy of Science, 64(1), 259-266.
Available at: https://scholarworks.uni.edu/pias/vol64/iss1/32