If we order the feed too early, and it arrives the next day (as has happened in the past) there may not be room for it in the silo.
So when I think there's just a couple of days feed left in the silo, I order a delivery. The difficulty then is that the feed mill understandably wants to minimise its fuel costs (don't we all) by waiting 'til it has a full truck load for the area - which may be three, four or even five days away.
That's what happened this time. I had to go to our local feed store to buy ten bags of mixed grains to get the chooks through - needless-to-say they didn't much care for the change in diet.
So after the truck delivered this morning, I went round the farm filling up the feed bins in each paddock and the chooks thought I was Father Christmas!