I think we aren't ruthless enough, we should weigh more...currently looking at a computer package to help with that. We never get O+3 so it is tempting to try for 4L in the hopes that they make O+4L.That's essentially what I find very few cattle on the current diet pay for themselves above 650kg on my farm. But that is just probably due to the cost of the diet. Waste products that mo! uses will change that. Anything that drops below the paying for themselves is up the road.