Growing-finishing trials with feedlot cattle have not revealedThere is nothing like reading an out of context quote to perk up the senses. I pulled this one out of a animal science paper while researching the relationship between fats in the diet of cattle and the quality of fat produced in the cattle body.
consistent differences between tallow, yellow grease, blended
animal-vegetable soapstock, cottonseed soap stock or soybean soap
stock (Lofgreen, 1965; Brandt, 1988; Zinn, 1989a, Tables 1 to 18).
The references cited here are dated so it's not clear if the assertion all of these fats produce more or less the same results (rates of growth, marbling, flavor etc.) in feedlot cattle. But it does give one the heebie jeebies to recognize that the feeding of things such as tallow (rendered beef fat) and yellow grease (used frying oil) to cows has been the object of serious scientific scrutiny.
Click the title of this post or HERE to read the paper from which the excerpt was excerpted.