Fontes proteicas e idades de abate sobre a estrutura e ultraestrutura do intestino delgado de leitões desmamados

Two experiments (experiment 1 - conventional feeding and experiment 2 - feeding of the sows, starting at 109 days of pregnancy and during lactation, and the lactating piglets, with rations without soybean meal) were conducted to evaluate the effects of sources of protein (soybean meal-SBM, extruded semi-integral soybean-ESISB, and milk products-MP) on the intestinal morphology of piglets slaughtered at the 0, 5 and 15 days later at weaning. Twenty-seven piglets weaned with 25 days of age were used, being nine piglets slaughter in each slaughtering age. A 3 ×3 factorial (3 diets × 3 slaughtering ages) was studied, according to a randomized block design. The results showed that animals receiving SBM, presented lower values of villi height and villus: crypt ratio when compared to those that received ESISB or MP. The villi height and the villus: crypt ratio were not affected by the differential feeding of the sows and of the piglets before the weaning. The depth of the crypt was not affected by diets or slaughtering ages in none of the segments studied being, however, smaller in the duodenum and bigger in the jejunum and ileo of the animals of exp. 2. It was concluded that the SBM was the affected the height of the villi and the relationship villi: Crypt negatively after it weans. The intestinal morphology was more affected at five days, showing signals of recovering at 15 days after weaning and that the feeding of the sows did not affect the morphology of the segments of the thin intestine.

Protective effect of mannan oligosaccharides against early colonization by Salmonella Enteritidis in chicks is improved by higher dietary threonine levels

Aims: To evaluate mannan oligosaccharide (MOS) and threonine effects on performance, small intestine morphology and Salmonella spp. counts in Salmonella Enteritidis-challenged birds. Methods and Results: One-day-old chicks (1d) were distributed into five treatments: nonchallenged animals fed basal diet (RB-0), animals fed basal diet and infected with Salmonella Enteritidis (RB-I), animals fed high level of threonine and infected (HT-I), birds fed basal diet with MOS and infected (MOS-I), birds fed high level of threonine and MOS and infected (HT+MOS-I). Birds were inoculated at 2d with Salmonella Enteritidis, except RB-0 birds. Chicks fed higher dietary threonine and MOS showed performance similar to RB-0 and intestinal morphology recovery at 8 dpi. Salmonella counts and the number of Salmonella-positive animals were lower in HT+MOS-I compared with other challenged groups. Conclusion: Mannan oligosaccharides and threonine act synergistically, resulting in improved intestinal environment and recovery after Salmonella inoculation. Significance and Impact of the Study: Nutritional approaches may be useful to prevent Salmonella infection in the first week and putative carcass contamination at slaughter. This is the first report on the possible synergistic effect of mannan oligosaccharides and threonine, and further studies should be performed including performance, microbiota evaluation, composition of intestinal mucins and immune assessment. © 2012 The Society for Applied Microbiology.

Efeito da suplementação de betaína em dietas de frangos de corte em condições de termoneutralidade

The aim of this study was to evaluate the effect of inclusion of betaine in broiler diets on performance and intestinal morphology of broilers during periods 1 to 7 and 8 to 21 days old. Were used 1,408 Cobb male broiler, randomly assigned into 4 treatments with 16 replicates of 22 birds in environmental chambers. The treatments were: i) positive control - diet formulated according to the nutritional requirements of the birds; ii) negative control - with reduction levels of methionine and choline; iii) negative control + 0.092% supplementation of betaine in substitution of methionine and total choline; iv) negative control + 0.1% supplementation of natural betaine to replace partial methionine and total choline. Were evaluated feed intake, weight gain and feed conversion at 7 and 21 days old. At 25 days were evaluated crypt height and depth of jejunum. The results were analyzed by ANOVA and mean comparison test. The results obtained with the supplementation of betaine in the feed only demonstrated a positive effect on feed consumption during 1 to 7 days, and villous height of the jejunum in the period of 8 to 21 days. Supplementation of 0.1% betafin (96% natural betaine) in the diet provided significant improvements in the morphological characteristics of the small intestine of broilers.

Efeito da pectina cítrica sobre o desenvolvimento e a saúde do intestino delgado de frangos de corte

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Melhoradores de desempenho na alimentação de frangos de corte

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Celulose em dietas para leitões recém-desmamados

Pós-graduação em Zootecnia - FCAV

Fibra dietética e oligossacarídeos na alimentação de suínos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Nucleotídeos na dieta de frangos de corte criados no sistema alternativo

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Efeito de dietas fibrosas com redução de proteína bruta para poedeiras comerciais, visando a diminuição do impacto ambiental

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Alterações de parâmetros fisológicos e imunológicos em matrizes de frangos de corte vacinadas ou não contra a bronquite infecciosa das galinhas submetidas a diferentes períodos de jejum pós-eclosão

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Acido fumárico e quelato de cálcio contendo fósforo na dieta de leitões desmamados: desempenho e características intestinais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fontes de fibra na alimentação de juvenis de pacu (Piaractus mesopotamicus)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito da idade de matriz e da exposição gradual ao CO2 na primeira fase de incubação sobre o desenvolvimento in ovo e desempenho de frangos de corte

Pós-graduação em Zootecnia - FCAV

Plasma e ou extrato de levedura em dietas de leitões nos períodos pré e pós-desmame

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Avaliação de aditivos em dietas de frangos de corte

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)