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Foram conduzidos dois experimentos com o objetivo de determinar o valor nutricional da glicerina semipurificada neutralizada (GSPN) e avaliar o desempenho de suínos na fase pré-inicial (6 a 15 kg), alimentados com rações contendo níveis crescentes de GSPN. No Experimento I, foi conduzido um ensaio de digestibilidade com 30 leitões machos castrados (11,80 ± 5,12 kg), distribuídos em um delineamento em blocos casualizado. Os níveis de substituição da ração referência pela GSPN foram 3, 6, 9 e 12%. Os valores (na matéria natural) de Energia Digestível (ED) e Energia Metabolizável (EM) da GSPN foram 3535 kcal/kg e 3279 kcal/kg respectivamente. No Experimento II, foram utilizados 135 leitões recém-desmamados com 21 dias de idade (6,85±1,28 a 15,04±2,06 kg), distribuídos em delineamento experimental de blocos casualizado. Os tratamentos consistiram de cinco rações, (3, 6, 9, 12% de GSPN e uma ração testemunha com 0% de GSPN), com nove repetições e três leitões por unidade experimental. Os resultados demonstram que na fase pré-inicial I (6 a 10 kg) a adição de GSPN promoveu melhora linear no ganho diário de peso (GDP) e conversão alimentar (CA). Para o período total (6 a 15 kg), foi observado apenas melhora linear (P ? 0,05) para GDP. As variáveis plasmáticas não foram influenciadas pela inclusão da GSPN. Os resultados sugerem que a GSPN pode ser incluída em até 12% em rações para leitões (6 a 15 kg) sem influenciar as variáveis plasmáticas, de desempenho e as variáveis econômicas.Two experiments were carried out to determine the nutritional value of neutralized semi-purified glycerin (NSPG) and to evaluate the performance of pre-starting piglets (6-15 kg) fed on diets containing increasing levels of NSPG. In Experiment I, a digestibility trial with 30 barrows (11.80 ± 5.12 kg live weight) was conducted, in which they were allotted in a randomized block design. Replacement levels of the basal diet by NSPG were 3, 6, 9, and 12%. The values (as-fed-base) of digestible energy (DE) and metabolizable energy (ME) of NSPG were 3535 and 3279 kcal/kg, respectively. In Experiment II, 135 piglets, weaned at 21 days of age (6.85 ± 1.28 to 15.04 ± 2.06 kg), were allotted in a randomized-block design. Treatments consisted of five diets (3, 6, 9, and 12% NSPG as well as a control diet with 0% of NSPG), with nine replications, and three piglets per experimental unit. The results show that, in the pre-starting I (6-10 kg) phase, adding NSPG promoted a linear improvement in the average daily gain (ADG) and the feed-to-gain ratio (F:G). For the total period (6-15 kg), only linear improvements (P ? 0.05) to ADG were observed. The plasma variables were not influenced (P ? 0.05) by the inclusion of NSPG, as it remained within the biological range of the species. The results suggest that up to 12% NSPG can be included in the diets of piglets (6-15 kg) without impairing the plasmatic variables, performance, and economic feasibility.

Neutralized semi-purified glycerin in pre-starting piglet feeding (6 To 15 kg)