about 50\50 thing, i dont really go for it.
Scientists have studied the nature of guineafowls in the wilderness of africa. and most of the results came upon, they are totally monogamous but the bond between the two sexes is quite not strong enough. the domestic guineafowl shares some certain charecteristic in which some of them come from the phesanidae family.
yes. guineas that are cooped have a low fertility rate. freeranging guineas have a high fertility rate. greens and insects make up the good health during the breeding season in birds.
you might need to get 2:6 ratio. in a flock, an unpaired female sometimes wait ntil the first hen went broody then pair up with the alpha male. the breeding behaviour of guineafowls is quite complex and to study it, its another thing to get on point.