Instrumental performance as a function of the energy content of the diet.
D000818:Animals; D001522:Behavior, Animal; D001835:Body Weight; D002151:Calorimetry; D004032:Diet; D005502:Food; D008099:Liver; D008297:Male; D009042:Motivation; D009929:Organ Size; D011488:Protein Deficiency; D051381:Rats