Thank you. In general, each chicken should have about 4 sq. ft. of space in the coop to prevent behavior problems. A 16-sq foot coop is about right for 4 chickens. You have two coops this size, which means you have adequate space for about 8 chickens. They are a bit crowded. You did not post pics of your coops, but ideally there should be one sq ft of ventilation for each bird in the coop to prevent buildup of toxic ammonia inside the coop and condensation.Each coop is about 3.94f x 4f. I
This makes me wonder if they may not be finding enough nutrition on your pasture. Saving money on feed should not be your primary consideration, but rather providing adequate nutrition to keep them healthy. You might try keeping the feeders full all day and see if this keeps them home. Of course if the neighbors have yummy grains next door, it won't help keep them home, lol!frequently fly over to our neighbours sheep field and hay field.
Sorry I got a little off-topic here. None of this directly addresses your rooster's mucus but it does go to maintaining your flock's health. If your rooster has plenty to eat I don't think he will nibble at foreign material like silicone. (Although it's common knowledge that chickens love styrofoam like children love ice ice cream! )
