The cornering for my adults would be a bad idea. My adults throw their food not sure why but they keep throwing their food in the air. Also when I move so close they become to paranoid especially when separating them it gets even worse. I'm hoping to get some that are "tame." The lady says that they are tame that they are willing to eat out of her hands so I will test it and if so I might buy some that are at breeding age or at least for Whites. BS I will try to get as close to Marshmallow's age. I understand that you guys aren't trying to pick on me I'm just saying it's something that I've heard I gave it to my peas though I haven't done a test which I might do for a Senior project. I'm thinking on Senior project ideas since it's only one more semester until I'm a senior so I might do that as a Senior project showing what can be used as wormers and if they are effective.
Look, use your common sense here. You don't "corner" the bird so that it feels trapped. You just use food (a positive reward) to move the bird where you want it to go, and you just keep the birds apart from each other for literally seconds, not minutes, not hours. You don't chase the bird... it's all positive reinforcement. If you go negative (chasing the bird or scaring it) while you are trying to use positive reinforcement, you can mess up all the progress you have already made with the positive reinforcement. You may want to read a book about behavior mod training, like the clicker training books. They use chickens to teach trainers how to clicker train students. Heck, you can clicker train the peas if you have time and patience.
If individual treats won't work, you can do the mash or dressing the food with it... you only have a couple of birds in each enclosure, right?
You need to learn how to do this safely, effectively, and without stressing your birds unnecessarily... kinda like AugeredIn told MinxFox the other day that she needs to do hatching... and just like I need to get my birds more accustomed to being handled so I can weigh them. There's stuff we just gotta do.
I don't think I would use this particular experiment on my peas as a senior project, just because the consequences could be so severe for the peas, and there needs to be a parasite load in order to tell if the experiment worked. You really don't want parasitic loaded peas.
Maybe you could take a batch of chickens that are heading for the freezer and use them? That way you can examine the insides when you are done. Hatch 'em and grow them to 16 weeks or 20 weeks or whatever age you like, treat some with one thing, treat some with another, don't treat some (put bands or rings on them to tell them apart), then harvest them and check intestines, organs, etc. Run fecals while you are doing it so you can compare your fecal results with examining the gut after harvesting the birds. Keep detailed records. That would be a good project in my book.