When feeding pigs, feed wheat/lupin mix in the winter, spring, time ..... the pig grows and keeps warm due to the high content of wheat. But in the summer time and autumn the amount of wheat is too much so you have to add something else such as oats...... just to allow the pigs to grow. otherwise they just put the fat on cause food does not keep them cool. ...it only keeps them arm so the back fats should be down round 8 or 9 during the winter and it should be he same in the summer. Too little protein also interferes with back fat, so if they graze only they will automatically put fat on.