We ran into that in SD this spring, we went out for merriums and couldnt get them to gobble at all, they would gobble in the morning like 3 maybe 4 times if we were lucky and that was it, they all had a dozen hens with them..I just dont think they need to gobble when they are roosting with the hens and can see them 2 limbs over they dont have to gobble at all...Plus if they get pressured they know to keep quit or get lead in the rump...Just my thoughts no expert by no means...Good luck hopefully you can get a poke at one...