Scanned images off feed bags for starter and EggMaker feeds
This is the pre-mixed starter feed I purchase and use for my keets. Note the medication in this "medicated turkey starter" is a coccidiostat to aid in the prevention of coccidiosis, not to be used as a treatment after a keet raised on unmedicated feed might get this infectious, often fatal disease. If your feed mill does not carry this feed, ask them what they recommend, and ask what is available to you. Some feed mills carry only unmedicated turkey starter.  Some also offer a game bird starter. There is no feed at this time called GUINEA FOWL FEED, KEET FEED, etc, such as there is for other poultry, specified as Turkey Starter, Chick Starter,  Game Bird Starter, etc.  Keets can survive on chick starter but turkey starter is much better for them due to the higher protein content. 

Beginning at 6 weeks of age, wean keets off this starter feed onto a regular turkey grower by gradually mixing increasing amounts of grower feed into the starter until the bag is empty around 8 weeks of age.  See "Gardening with Guineas" for details and the feed schedule I use from keet through adult. (pages 60-64)

This feed bag label below is off a 50# bag of egg maker crumbles fed to my own adult guinea fowl year around.  The 18% protein supplied in this nutritionally complete mix is fine for adult guinea fowl. They get extra protein from bugs and insects when they are on range daily during laying season. 

Guinea fowl raised without chickens might be fed a turkey or game bird feed.  The high protein feed is necessary for fast growing keets should not to be confused with the amount of protein in a pre-mixed feed for adults.  17-18% protein is good for adult guinea fowl.