We are trying the protein tubs this winter. They said it would last 20 cows 20 days. It lasted 13. We are using 2 tubs and and there are about 40 head. the tubs are around $89. What is your opinion on feeding this way? Round bales are free choice. The cows do look great. Feeding this way is soooo.... easy. Much nicer than getting mobbed when feeding cubes. We are also starting to do this with our goats. The tubs work great for them as well I am not so sure about cost effective. What is the opinions out there?