This may be explained by the increase in cost of buying in animal feed which has promoted farmers to grow their own, either for feeding their animals or selling.
Un rheswm posibl am hyn yw’r cynnydd yng nghost prynu bwyd ar gyfer anifeiliaid, sydd wedi hyrwyddo ffermwyr i dyfu cnydau eu hunain, unai ar gyfer bwydo eu hanifeiliaid neu ar gyfer gwerthu.