This is what I'd suggest, although it's hard to make one word out of it (like so many Gernan words). It would refer mainly to poultry and rabbits, maybe a few others as well. Many of these older breeds are rare and have been replaced by (supposedly) better producing commercial breeds. And many of the so-called commercial "breeds" are actually hybrids, at least in poultry. These older breeds are also known as heritage or heirloom breeds, and judging by your context it seems that's what they're talking about here.