: : I hope someone out there can direct me to some research results of cows eating liquis protein supplement. I have found lots of results from steers on summer grasses but nothing for supplement brood cows in the winter. Any info would be helpful. Thanks ya'll.<br>I would be cautious about spending my money on a high protein NPN(non-protein nitrogen) , aka urea on a low grain diet. You are probably wasting a lot of your money, and just running a lot of the ammonia through the cow. I just looked it up to make sure from my college (Colorado State) feeds and feeding textbook, and I quote"Urea is not usually considered a satisfactory nitrogen supplement for low quality roughages" Carbohydrates from grains are necessary for the chemical reaction to occur to make urea of any use to the animal. If you want to feed liquid, we feed a by pass protein liquid that is only half urea, and the other half blood and feather meal protein sources. I don't feed our cows any liquid, but prefer cottonseed or soybean meal.<br>