Better feathers?

[Elitefarm]

My sister plans on showing a few of my chickens at our local fair my rooster mostly but his tail feathers are starting to look pathetic, in the beginning of the year his tail was gorgeous small but he's still young, now it's almost non existent am I doing something wrong? :/ what can I give him to help? He also has a slight red "rash"? Coming from his vent is this normal? First time owning a rooster
This was him in February

This was him today

 

[ChickNanny13]

Check for mites/lice around his vent area, under the wings close to the skin. Check your coop at night, run a white rag/paper towel along the roost. You can also run you hand along the roost, if you feel crawling, you've got mites.

 

[Elitefarm]

I treated them for mite about a month ago but have never seen any on him in my weekly checks :/ haven't seen any mites on any of them in the March at all

 

[Elitefarm]

Just looked at him and the others and no signs of mites at all, I'll treat again but any other thoughts?

 

[Brahma Chicken5000]

How old is he? If he is under a year old he is a cockerel and won’t have the nice long sickle feathers of a mature cock.

 

[Elitefarm]

He is under a year but I'm more just wondering why his feathers are getting bad I know he isn't full grown yet (7 months) but he's balding in a few spots

 

[ChickNanny13]

Is he being "pecked" at or bullied? Maybe Jr Molt? Where are you located?
You may want to update your profile with location; knowing your weather/climate, possible predator situations, supply availability and time zone (tagging help in your area).

 

[Elitefarm]

I'm from Washington it's been fairly nice and all the other girls look pretty great other then one or two of his "favorites" have a little neck balding but I haven't seen anyone pick at him or his feathers he's definitely the one in charge out of the flock.

 

[ChickNanny13]

Re-read post, does he still have that "red rash" at his vent area?
Could we get a picture? Maybe it's an allergy?
Anything change in supplies or activities or housing?
What are you feeding?

2x Brahma Chicken5000 although I do see the difference in the "before and after" pics.

 

[Elitefarm]

I'll try to get a picture of the rash, I did just change them to flock grower but like just changed him 3 days ago (after feather loss and rash) no change in supplies I have been letting the free range a few hours a day since it's been sunny?