We get 1 to 2, 25 kg bags of brewers barley a week. We put it in large trug with holes in the bottom ( to help drainage), cover it and try to keep it out of the sun. It seems to keep ok for about a week but then this summer hasnt exactly been a heat wave here in east anglia! We feed our 5 pigs (large blacks and OSBs) 10 scoops of pig nuts, twice a day. If we have barley we take out 2 scoops of nuts and replace with 8 small scoops of barley. The pigs dont like the barley as much as the pig nuts and always eat it last! There size looks good so far. We will see for sure in a few weeks when they go to "the seaside"!