Hi - my 19 week old rooster Moe has developed some purplish tinting on the back half of his comb. We've been experiencing true autumn weather lately, especially overnight, recently dipping down into the 40's. Within the last 2 weeks he's started crowing and started trying to mount the pullets, so I know he's going through hormone changes. His voice sounds normal, and he's acting normally - normal activity level, normal appetite, etc.
Is this normal, or something to worry about? I feel like his comb and wattles are especially large for his age, so I wonder if it's just a circulation issue?