Help! I've had my four young laying hens about 3 months, and just switched from regular laying crumbles to organic crumbles -- same size, different company and product. Unfortunately, they won't touch the stuff. I know I should blend the old with the new feed, but I am completely out of the old. Will they just get hungry enough to finally eat the new after a while? Should I force them, by not giving them anything else, like their usual access to yard food and greens (which they love)? They are laying very well, BTW. How long should I give them to make the switch? Thanks for advice!