As already mentioned before, chicken vary in feather quality which is partially due to genetics, feed, weather, abrasion and husbandry conditions.
What kind of feeder do you use? The abrasion seen in the front and lower front neck might result from sticking their head through the fence to reach something alluring on the other side. Or it can result from the use of sharp-edged metal feeders or waterers.
The otherwise broken feathers could be a result of genetics and abrasion combined. What are the dimensions of your chicken door, do they have ample space to and fro or do they rather have to squeeze through? And is it a soft coated or rather sharp-edged frame which might harm the feathers while doing so? The same implies for the nest boxes.
What really made me suspicious of mites is this:
What kind of feeder do you use? The abrasion seen in the front and lower front neck might result from sticking their head through the fence to reach something alluring on the other side. Or it can result from the use of sharp-edged metal feeders or waterers.
The otherwise broken feathers could be a result of genetics and abrasion combined. What are the dimensions of your chicken door, do they have ample space to and fro or do they rather have to squeeze through? And is it a soft coated or rather sharp-edged frame which might harm the feathers while doing so? The same implies for the nest boxes.
What really made me suspicious of mites is this:
at first it starts with feathers that look wet, even though they are not wet