I use a liquid mineral supplement ,based on molasses with 3% urea ,3% salt, 3% lime,& trace elements. Species which cannot usually be trained to use a solid block will use this.I go through at least 300kg of molasses per week.Its extra work & expense, however very good value considering the results.My animals diet is grass & browse based.Less than 10% would be grain.Most of the protein from grain is rumen digestible,so the grain or pellets are just an extra & help with herd management ,as its easier to approach & work the animals if they are fed out grain a couple of times a week.Even the feed processors admit 1kg of urea used correctly delivers as much protein as 900kg of grain at 14%. Cheers Sharkey