ResumoA carboximetilglucana (CMG) é uma molécula solúvel, composta de resíduos de glicopiranosil unidos em β(1-3) e β(1-6), que possui a capacidade de ativar o sistema imune do hospedeiro. O objetivo do presente estudo foi avaliar as características produtivas e imunológicas de 192 frangos de corte (Gallus domesticus) da linhagem COBB, que receberam rações contendo 0%, 0,025%, 0,050% e 0,075% de CMG de Saccharomyces cerevisiae adicionada em farinha de milho. Todas as aves foram imunizadas contra a doença de Newcastle e, em cada tratamento, 3 aves escolhidas aleatoriamente receberam CMG intramuscular no 3º, 7º e 14º dia. Foram avaliados o desempenho animal, o desenvolvimento da bursa de Fabricius e lâminas histológicas do intestino delgado, além do número de células fagocíticas no sangue e níveis de anticorpos no soro. Os resultados mostraram diferença no ganho de peso e consumo de ração das aves que consumiram a CMG no período de 1 a 21 dias. O peso relativo da bursa de Fabricius aumentou nas aves suplementadas com 0,025 e 0,050% de CMG. O número de células fagocíticas e os níveis de anticorpos totais dos frangos de corte, aos 21 dias de idade foram maiores nas aves que receberam CMG na ração. Para os animais que receberam CMG via intramuscular foi observado aumento no título dos anticorpos específicos para Newcastle. Palavras-chave: β-glucana, aves de corte, atividade imunomodulatória, levedura AbstractThe carboxymethylglucan (CMG) is a soluble molecule, composed of glucopyranosyl linked by β(1-3) e β(1-6), which can activate the immune system of the host. The purpose of this study was evaluate the productive and immunological characteristics of 192 poultry (Gallus domesticus) COBB line which received feds containing 0%, 0,025%, 0,050% e 0,075% of CMG from Saccharomyces cerevisiae added in corn flour. All poultry were immunized against Newcastle disease and at each treatment 3 poultries randomly chosen received CMG intramuscular at 3, 7 and 14 days. It was evaluated the animal performance, development of the bursa of Fabricius, histological slides of the small intestine, counts of phagocytes cells in blood and levels of antibodies in serum. The results showed difference in weight
Yeasts discarded in industrial processes can be used as a nutritional supplement and to extract cellular components with biotechnological aims. In this study, the humoral immune response of Swiss mice treated with mannoproteins (MP) from the yeast Saccharomyces uvarum was evaluated. The mice were treated with MPs at different doses and times and inoculated with 2% sheep red blood cells. An increase in total Ig in mice treated with 100 µg of MP at the time of immunization or 24 h before was observed in the primary
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