Pharmboy provided this :
-Heirloom turkeys are varieties that once were widely raised, but have since gone out of commercial favor. These “retro” birds are sometimes referred to with different names and represent a small, but growing movement in California.-
Probably the heirloom turkeys went the way of most things - the big commercial poultry farmers wanted specific traits, so the older varieties eventually fell to the wayside as newer breeds were developed.....likely larger breasted with milder flavored flesh.
I think you are likely right: more meat (esp. white) and less gaminess. On the website they say it is closer to the wild bird.
Thanks, Ladysforest and Pharmboy. I never heard this before relating to turkeys. Vegetables... yes but never poultry. I’d try it in a heartbeat!