One experiment was conducted in the Animal Science Department of University of Lavras (UFLA) to evaluate the effects of rations with low crude protein, supplemented with essential and non essential amino acids, in carcass characteristics and weight visceral organs of swine of the 32 to the 57kg. Thirty crossbred barrows were divided in five treatments that had consisted of rations with different crude protein (CP) levels (10; 12; 14; and 16%). A fifth treatment added to non essential aminoacid in the ration with less CP level (10+NNE) was included. After it slaughter visceral organs had been removed, emptied and weighed. The nitrogen consumption did not influence (P>0.05) the weight of the liver, pancreas, kidneys and heart. The weight of the total gastrointestinal tract and the weights of the TGI plus organs have been bigger (P<0.05) in treatments 14 and 16 in comparison with treatments 10+NNE and 10. It is concluded that crude protein level does not has effect in the weight of viscera intestines, but modifies the weight of the gastrointestinal tract of growing swine.
energy; ideal protein; synthetic amino acids
