Why is my chicken losing feathers

It can't breath becouse you keep choking it.

Is there another chicken? Is your initial chicken male or female? Is the other chicken male or female?

Female + female - male = females fighting for territory by pulling out feathers, or females becoming stressed and simply losing feathers.

Female + female + male = even, smooth-running animal kingdom in your chicken coop. Get the females desexed.

Male + male = territorial disputes, stress, loss of feathers.

Female/male + nothing = lonely, depressed, probably suicidal chicken. They are pack animals and you simply cannot have just one. Two females is better than just one chicken.

If it is none of the above, I'd consider changing their diet, maybe separating them for a while, and maybe just have a look at how the rest of the 'pack' is treating the chicken. The last think you should check is that they have enough space and foraging material. All these things can lead to stress and loss of feathers.

Good luck.

It sounds just like it's molting to me. Chickens molt, losing their old feathers and growing new ones. They can be early molters or late molters. The early ones do it slowly dropping just a few feathers at a time and it can last from 4-6 months. The late molters do it much quicker and it takes just about 2-3 months total.

If it is a female and she is losing feathers on her back, just over her tail, it could be from the male(s) sexual affections.