As Alaskan says, I would be hugely surprised if a two week old chick was impacted. They normally get very full crops and you would of course expect the crop to be full of chick food...what else??? and maybe a few feathers and some bits of bedding. Who told you it was impacted??
Chicks naturally gorge themselves on food, some more than others and it is common for them to have a solid prominent crop most of the time, especially if they have a heat lamp and can eat day and night. I really, really think you may have acted impetuously in having surgery done..... and a vet may not have had much idea about dealing with chickens to have suggested it. I have done crop surgery myself, so I have a bit of an idea what I am talking about. There is very little swelling after surgery in my experience although that was on an adult bird, so any swelling would be less obvious, but the chick is extremely likely to fill its crop back up with food again.... it's what the crop is for, so that is likely what you are seeing. I would feed the chicks a wet mash made with their crumb or better still ferment it, rather than dry crumb, to ensure that they are getting enough fluids with it and their crop remains pliable. Really feel this may have been unnecessary surgery!
Is there a post on BYC about the impaction with photos and more information. There are many posts each year on BYC from newbies who worry about the large bulge on their chick;s chest and think it is a tumour or something is wrong and it is always just a full crop.
Regards
Barbara
PS. Can you post a photo of the chick in it's current state, so that hopefully we can reassure you.
