yes there is a finisher feed and many of them around. Can be made out of most grains but a combination of grains not just one grain. it is a waste to feed just sow feed or weaner feed to a pig just to make it fat or skinny or slow in growth if you are selling for meat. Weaner to 20 kg 18% protein, grower to 50 kg 16 % protein, finisher to 80 kg 14% protein, change of feed to finisher from 80 - 90 kg to more wheat. less oats, more lupins 15% protein.