RESUMO -Foram realizados dois experimentos (E) com 204 leitões Large White (E 1 : dos 7,23 aos 12,32 kg; e E 2 : dos 12,64 aos 23,81 kg). O delineamento experimental foi de blocos ao acaso com quatro níveis de treonina na ração (E 1 : 0,80; 0,87; 0,93 e 0,99 %; e E 2 : 0,69; 0,74; 0,80 e 0,85 %); oito (E 1 ) e nove (E 2 ) repetições para o consumo diário de ração (CDR), ganho diário de peso (GDP), ganho diário de peso ajustado (GDPA) e conversão alimentar (CA); e cinco repetições para uréia plasmática (U). Não se observaram diferenças no CDR e GDP (P>0,10). Verificaram-se efeitos quadráticos da treonina no GDPA do E 1 (P=0,086) e E 2 (P=0,052), na CA do E 2 (P=0,035) e na U do E 1 (P=0,002), bem como efeito linear negativo na CA do E 1 (P=0,030) e U do E 2 (P=0,044). O nível de 0,89% de treonina minimizou o teor plasmático de uréia e o de 0,94% maximizou o ganho diário de peso ajustado no E 1 , enquanto no E 2 0,76% de treonina na ração maximizou o ganho diário de peso ajustado e minimizou a conversão alimentar.Palavras-chaves: aminoácidos, ganho de peso, leitões, uréia plasmática Threonine Requirements of Piglets from 7 to 12 and from 12 to 23 kg ABSTRACT -Two experiments (E) were conducted, using 204 Large White piglets (E 1 : from 7.23 to 12.32 kg; and E 2 : from 12.64 to 23.81 kg). A randomized block design was used, with four levels of threonine in the ration (E 1 : 0.80; 087; 0.93 e 0.99%; e E 2 : 0.69; 0.74; 0.80 e 0.85 %); eight (E 1 ) and nine (E 2 ) replicates for daily intake (DI), daily weight gain (DWG), adjusted daily weight gain (ADWG) and feed conversion (FC) and five replicates for plasma urea (U). No treatment differences (P>0.10) were observed for either DI or DWG. Quadratic effects of threonine were observed on ADWG in E 1 (P=0.086) and E 2 (P=0.052), on FC in E 2 (P=0.035) and on U in E 1 (P=0.002); as well as a linear effect on FC in E 1 (P=0.030) and on U in E 2 (P=0.044). U was minimized at 0.89% threonine in E 1 , whereas ADWG was highest at 0.94%, in E 2 , 0.76% threonine maximized ADWG and minimized FC
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