Creep feeding is a technique of providing feed to nursing lambs to supplement the milk they consume. Creep-fed lambs grow faster than noncreep-feds and are more aggressive in nursing ewes. This aggression stimulates greater ewe milk production which, in turn, increases creep feed intake because these lambs will be bigger at a given age.
Ely, Donald G. and Fink, Endre, "Is Creep Feeding Lambs a Profitable Undertaking?" (2014). Agriculture and Natural Resources Publications. Paper 146.