By Donald Stotts  STILLWATER, Okla. – A nursing foal’s nutritional requirements will exceed the mare’s ability to supply nutrients to the foal through its milk a few months after birth, underscoring the need to provide access to solid foods.  Commonly called creep feeding, research indicates the practice will not only provide many of the necessary nutrients for sound bone and muscle growth, it also will lessen weaning stress, said Kris Hiney, Oklahoma State University…