Guinea x Chicken or rather, its reciprocal cross is an extremely valuable meat bird that can exhibit hybrid vigor under certain circumstances. The news of a Faverolle x Guinea combination excites me because I have been studying these hybrids for many years and have been in contact with the foremost US authority and researcher:
Dr. Samuel Nahashon
Institute of Agricultural and Environmental Research
Tennessee State University, Nashville, TN
You may be surprised (or not!) at the very high prices (and appreciation) lavished on the guinea hybrid meat in the eastern metropolitan markets, e.g. NYC, say D'Artagnan's (a major purveyor of specialty fowl), or Dean & DeLuca.
There are French Hybrid guinea broiler strains (male) crossed into suitable female chicken lines via artificial insemination to produce the required crosses.