7-8 month old Seabright pale and cracking

[Spruceroost]

I injected him with the Tylan 50. I wish Tractor supply carried more of it because they are always out. I had to go further up north. I thought he took the needle pretty well for a rooster. I'll let everyone know how he does. Thanks For Helping the little guy out!

 

[Wyorp Rock]

Going by the smell and the trouble breathing, it's likely coryza....The nasty thing about coryza is that although you can treat the symptoms, it will never fully be cured, and you will have to treat again every time there is a flareup...
.....Chickens don't get colds like we do. Chickens get respiratory diseases, which are nasty things that need antibiotics to treat and never actually are cured, like mycoplasma or coryza. Or they can get viruses like infectious bronchitis, which, being viruses, cannot be treated with antibiotics (like a real cold, incidentally).

I couldn't agree more with @Pyxis

What are your chicken keeping goals?

Keep in mind that antibiotics will only treat secondary infections and won't cure the illness. Infectious Coryza (which is most likely what he has) will make him and any birds that have been exposed to him, carriers of the illness for life.

Try to keep the mucous cleared the best you can. For goopy/runny eyes, flush with saline and apply Vetericyn eye gel or Terramycin eye ointment. Keep him hydrated and offer him some poultry vitamins in his water as well.

It would be best to weigh your bird so you can administer the correct dosage of Tylan50. It can be given orally as well. A general "guideline" dosage of Tylan 50 is 1 cc or ml per 5lbs of weight, given 2x a day for 5days. As you can see from Plumbs Veterinary Manual, the dosage can vary greatly. If he is improving with the dosage you are administering at this time, then stay with that, if he is not, then consider adjusting your dosage.

 

[Spruceroost]

Thanks for the help everyone, I think he's doing better, I'm still watching him though. I've been injecting him with Tylan-50 and adding additional vitamins to his water. His color seems to be coming back.

I don't plan on selling or breeding my chickens, I'm in it for the eggs. I'll keep watch on the others and see what develops as well.

Here is a recent one of my brave rooster in recovery:

 

[Wyorp Rock]

He does look better than that first photo.

What a sweet handsome fella he is

I do hope he continues to improve, thank you for the photo and update.