2534 FERRELL AND KOONGto nutriti<strong>on</strong>al restricti<strong>on</strong>s. In the study <str<strong>on</strong>g>of</str<strong>on</strong>g>Foot <strong>and</strong> Tulloh (30), weights <str<strong>on</strong>g>of</str<strong>on</strong>g> the emptybody, fat, water <strong>and</strong> protein remained c<strong>on</strong>stant during the 120-d period <str<strong>on</strong>g>of</str<strong>on</strong>g> weight stasis, but feed intake decreased from 82 to 56g/kg n' 7^ . Their data suggested that thedecreased maintenance was associated withdecreased mass <str<strong>on</strong>g>of</str<strong>on</strong>g> internal organs, especially the liver. Ledger <strong>and</strong> Sayers (31) similarlynoted that feed required to maintain liveweight <str<strong>on</strong>g>of</str<strong>on</strong>g> steers fed to maintain live weightdecreased with time. Their data indicatedthat weights <str<strong>on</strong>g>of</str<strong>on</strong>g> internal organs <strong>and</strong> emptydigestive tract decreased in resp<strong>on</strong>se tomaintenance feeding.The data reported in tables 7 <strong>and</strong> 8 suggest that weights <str<strong>on</strong>g>of</str<strong>on</strong>g> the internal organs wereinfluenced by nutriti<strong>on</strong>al treatment <strong>and</strong>that weights <str<strong>on</strong>g>of</str<strong>on</strong>g> the liver <strong>and</strong> gut werepositively associated with rate <str<strong>on</strong>g>of</str<strong>on</strong>g> gain priorto slaughter, as well as with body weight.That weights <str<strong>on</strong>g>of</str<strong>on</strong>g> internal organs are influenced by plane <str<strong>on</strong>g>of</str<strong>on</strong>g> nutriti<strong>on</strong>noted in several species (30-35).has beenThere arealso data suggesting that metabolic rate perunit weight as well as weight may change inresp<strong>on</strong>se to changes in plane <str<strong>on</strong>g>of</str<strong>on</strong>g> nutriti<strong>on</strong> orphysiological state (36). Since these tissueshave a high rate <str<strong>on</strong>g>of</str<strong>on</strong>g> energy expenditurerelative to their size, changes in size <strong>and</strong>metabolic rate <str<strong>on</strong>g>of</str<strong>on</strong>g> the tissues may have asubstantial impact <strong>on</strong> maintenance requirements <strong>and</strong>, during the realimentati<strong>on</strong>period, <strong>on</strong> efficiency <str<strong>on</strong>g>of</str<strong>on</strong>g> body weight gain.The data presented here suggest that thegreater efficiency <str<strong>on</strong>g>of</str<strong>on</strong>g> growth <str<strong>on</strong>g>of</str<strong>on</strong>g>ten observedduring realimentati<strong>on</strong> after a period <str<strong>on</strong>g>of</str<strong>on</strong>g>nutriti<strong>on</strong>al restricti<strong>on</strong> results, in part, froma decrease in the maintenance requirements. This decrease appears to result fromalterati<strong>on</strong>s in proporti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> high energy expending internal organs as well as fromalterati<strong>on</strong>s in body compositi<strong>on</strong>. Also,alterati<strong>on</strong>s in compositi<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> body tissuegains (e.g., greater proporti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> water)should be c<strong>on</strong>sidered a comp<strong>on</strong>ent <str<strong>on</strong>g>of</str<strong>on</strong>g> thegreater efficiencies observed duringrealimentati<strong>on</strong>.LITERATURE CITED1. Armsby, H. P. (1917) The <str<strong>on</strong>g>Nutriti<strong>on</strong></str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> FarmAnimals, Macmillan, New York.2. 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