I have a flock of Icelandic chickens, they're medium sized birds. 6 one year old hens, 8 four month old hens, and 4 four month old roosters. We are going to be butchering 2 of the roosters soon btw. Everyone is fed grower crumbles right now, with oyster shells on the side for the adults.
Anyway, one of the adult hens, Cinnamon, has been routinely going to roost with a not full crop. Everyone else always goes to roost with a stuffed crop that feels good and solid, she doesn't. It's usually at half capacity or a bit less when she goes to roost, and it doesn't feel as hard usually. Sometimes it's harder like all the other hens, but usually when I check it at night it's a bit soft.
This has been going on for over 2 months with no change. None of the other birds have this problem, I check crops every night. Not sure what to do for her as I have carefully examined her many times and I can't find anything physically wrong with her other than that. She does always go to the roost early, and I don't see her aggressively pigging out before dark like the others. But she forages and explores around when I let them out to free range, she's active (unlike sick birds who get obviously lethargic), her crop isn't tender, she holds her tail feathers upright, her feathers are sleek and well maintained (aside from the fact that there's still some molting so she's lacking a few tail feathers), no mites or the like on her, no excessive scratching, poops look normal, no wounds or scabs, no eye or nose discharge, combs and wattles are the proper color, her breathing sounds normal, she's definitely drinking water, she dust bathes. What else... she really dislikes being held and won't come near me unless I have mealworms, but that's normal for her. Oh and she's never gone broody, unlike her sisters who are all declaring strike right now. I'm pretty sure she hasn't been laying for awhile since the most eggs I've gotten all summer is 5 out of 6, but I can't tell who is and isn't laying so it's a guess. I'm not getting any eggs right now, 4 hens are broody, one just quit being broody, and then there's Cinnamon.
Any thoughts??? She should be eating more, shouldn't she? Is there anything I can give her to boost her appetite, or are internal parasites a possibility? I kind of figured internal parasites would affect everyone though... So I'm at a loss.
Any help is appreciated! Thanks! 
Anyway, one of the adult hens, Cinnamon, has been routinely going to roost with a not full crop. Everyone else always goes to roost with a stuffed crop that feels good and solid, she doesn't. It's usually at half capacity or a bit less when she goes to roost, and it doesn't feel as hard usually. Sometimes it's harder like all the other hens, but usually when I check it at night it's a bit soft.
This has been going on for over 2 months with no change. None of the other birds have this problem, I check crops every night. Not sure what to do for her as I have carefully examined her many times and I can't find anything physically wrong with her other than that. She does always go to the roost early, and I don't see her aggressively pigging out before dark like the others. But she forages and explores around when I let them out to free range, she's active (unlike sick birds who get obviously lethargic), her crop isn't tender, she holds her tail feathers upright, her feathers are sleek and well maintained (aside from the fact that there's still some molting so she's lacking a few tail feathers), no mites or the like on her, no excessive scratching, poops look normal, no wounds or scabs, no eye or nose discharge, combs and wattles are the proper color, her breathing sounds normal, she's definitely drinking water, she dust bathes. What else... she really dislikes being held and won't come near me unless I have mealworms, but that's normal for her. Oh and she's never gone broody, unlike her sisters who are all declaring strike right now. I'm pretty sure she hasn't been laying for awhile since the most eggs I've gotten all summer is 5 out of 6, but I can't tell who is and isn't laying so it's a guess. I'm not getting any eggs right now, 4 hens are broody, one just quit being broody, and then there's Cinnamon.
Any thoughts??? She should be eating more, shouldn't she? Is there anything I can give her to boost her appetite, or are internal parasites a possibility? I kind of figured internal parasites would affect everyone though... So I'm at a loss.

