10-12 week Australorp girls (3) Just started mixing in a grower feed with their starter crumble. They're eating that all up + grasses, bugs and mealworms I bring out to them every day. Since I started adding in the grower (a scoop for every three of the crumble) they're crops have been empty. I check at about 4pm each day (there let out at 6am) and there is no food in there whatsoever. Only one hen had anything in her crop and it was smaller than a grape (whilst usually they fill up to a plum size). Could the new food be doing this? If so, how to I introduce the new food?