a breed of farm animal or bird that is kept mainly in order to stop the breed from disappearing, rather than to produce the maximum number of animals and make the maximum possible profit

Many scientists are promoting the conservation of heritage breeds to retain genetic diversity in the species. 许多科学家正在推动对珍传品种的保护，以保留物种的遗传多样性。

Their small family farm raises heirloom varieties of vegetables and heritage breed animals. 他们的小型家庭农场饲养着祖传品种的蔬菜和珍传品种的动物。