Our cows have started eating stones, and sometimes licking random Things. We are on volcanic rock and they have been crunching on stones on the edge of the tracks. We have reduced the amount of N that we have spread this year by 30% ish, milk ureas are at 75-125 instead of the usual 200-300. They are on all grass diet apart from 1kg of 12% parlour nut, 1 bag of mag chloride a day between 320 of them also all calved within last 10 weeks, they are also bulling really well. TIA