Semipurified glycerins on starting piglets feeding‏ (15-30 kg)

The nutritional value and the performance of piglets fed on diets with semipurified glycerin (SPGV) and mixed (SPGM) vegetable oil was determined and evaluated. Thirty-two crossbred piglets, allotted in a completely randomized block design, were used in the digestibility trial. Two types of glycerin (SPGV and SPGM) and three levels of diet (4, 8 and 12%) were studied. The experimental unit consisted of one piglet. Glycerins' metabolizable energy (ME) was estimated by regression of ME (kcal [kg.sup.-1]) intake associated with glycerin vs. glycerin intake (kg). ME as-feed-basis rates were 3,373 for SPGV and 2,932 for SPGM, or rather, the glycerins are highly available energy source for piglets. In the performance trial, 90 piglets were allotted in a completely randomized blocks design in a 2 x 4 + 1 factorial scheme, two glycerins, four levels (3, 6, 9 and 12%), five replicates (pens) and two piglets per pen. A control diet with no glycerin (0%) was additionally formulated. Since no effect of glycerin inclusion on pig performance occurred, it was feasible to use up to 12% of both types of glycerin on piglets feeding. Keywords: co-product, energy feedstuff, glycerol. Determinou-se o valor nutricional e avaliou-se o desempenho de leitoes alimentados com racoes contendo glicerinas semipurificadas de origem vegetal (GSPV) e mista (GSPM). Na digestibilidade foram utilizados 32 leitoes, machos castrados, distribuidos em delineamento em blocos ao acaso. Foram estudadas duas glicerinas (GSPV e GSPM) e tres niveis de inclusao na dieta-teste (4, 8 e 12%). A unidade experimental consistiu de um leitao. A energia metabolizavel (EM) das glicerinas foi estimada pela analise de regressao do consumo de EM (kcal [kg.sup.-1]) associada a glicerina vs. o consumo de glicerina (kg). Os valores de EM (kcal [kg.sup.-1]), na materia natural, obtidos foram 3.373 para GSPV e 2.932 para GSPM, indicando que as duas glicerinas sao fontes de alta energia disponivel para a alimentacao de leitoes. No desempenho, foram utilizados 90 leitoes, distribuidos em blocos ao acaso, em esquema fatorial 2 x 4 + 1, sendo duas glicerinas, quatro niveis de inclusao (3, 6, 9 e 12%), cinco repeticoes e dois leitoes por unidade experimental. Adicionalmente foi formulada uma racao-testemunha sem glicerina (0%). Nao houve efeito do nivel de inclusao de glicerina sobre o desempenho, sugerindo que e viavel a utilizacao em ate 12% de ambas as glicerinas na alimentacao de leitoes. Palavras-chave: alimento energe