Hello there, we've got a couple of meat birds whose crops don't seem to be emptying all the way. They go a solid 12 hrs without food overnight, but a few of them still come out of the coop in the morning with a noticanle crop. Is this normal? Is there something I should add to their diet? They are pastured, they are ranging and eating grower feed, grit, and all the goodies they can find. Any information is appreciated.