My 11 week old gander, Olai, has been congested this week. I'd thought it cleared up but this morning he sounds more congested than a few days ago. His eyes are clear and there is no nasal discharge. He kind of coughs and his chatter sounds are congested. He and his mate, Lupita, have been going outside for about 6 hours a day in bright sunshine with temps in the 40's- 50's during the day and down to mid twenties at night. They coop where they live with the chickens gets down to mid 40's at night. Their bedding is wood shavings. I freshen their water twice a day. I started giving them nutritional yeast about two weeks ago after learning their Grower/Finisher feed doesn't have recommended ratios of Niacin. Could the congestion come from the nutritional yeast? Lupita doesn't have any of the congestion, yet. Any ideas would be helpful. I do plan to reach out to local vets as well.