Part # 1 Hybrid vigor. Why Breeding Hybrids Fails in Gamefowl: The Illusion of Improvement. In the world of gamefowl, hybrids are a much needed entity, they do have a large purpose, the term "hybrid" often carries excitement. A hybrid—also known as a cross—is the result of combining two different strains or true families. The hope is often that you’ll get "the best of both worlds." Sometimes you do—for only one generation. But when you try to build off those hybrids, by breeding close, with bree