Since "feed my sheep" is a metaphorical reference.. The object of the metaphor must be gained.. How does a shepherd feed sheep?.. Obviously a shepherd does not feed sheep he takes them to where they can feed themselves.. a pasture.. A shepherd leads sheep to a bountiful pasture where they feed themselves.. Not pre digested stuff from the shepherds mouth.. The metaphor is rich and deep.. and exposes many errors.. Conversations with a real shepherd is a worthy task.. Feeding sheep in a holding pen(sheep pen) is much different than feeding them in a pasture.. Ps 23.. A mental task of considering sheep in a holding pen and sheep in a pasture would be a good meditation for any metaphorical shepherd..