Xilanase, probi?tico e simbi?tico em dieta de su?nos em crescimento

• Autor(a) principal: Justino, Lucas Rodrigo
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/jspui/5797
• topic: Aditivos; Desempenho; Manejo nutricional; Microbiota; Sa?de intestinal; Additives; Intestinal health; Microbiota; Nutritional management; Performance; Zootecnia

The experiment was carried with the objective of investigating the supplementation of the enzyme xylanase individually or in combination with probiotic or symbiotic in the diet of pigs with reduction of the level of metabolizable energy . The variables studied were daily dietary intake (CRD), daily weight gain (GPD), feed conversion (CA), bone parameters, intestinal morphometry, intestinal microbiota diversity and economic viability of the experimental diets. Seventy five male and female piglets were used, with a mean initial weight of 25,024 ? 3,21 kg. The experimental design was a randomized block design, containing five treatments, five blocks totaling 25 experimental units composed of three pigs (two males and one female), with the following treatments: T1 = Reference diet; T2 = Basal diet with reduction of 100 kcal / kg of metabolizable energy; T3 = T2 + xylanase (100g / ton); T4 = T3 + probiotic (B subtilis and Bacillus Licheniformis) and T5 = T3 + symbiotic (B subtilis and Bacillus Licheniformis and Mananoligosaccharide). It was observed that the animals that received the T4 diet presented lower CRD (P <0.05) in the first experimental period (1-22 days) in comparison to those that received the T2 diet. In the second experimental period (23-30 days) there was no significant difference (P> 0.05) between treatments for any of the performance variables. In the total period (0-30 days) it was observed that T2 resulted in worsening of feed conversion in relation to T4, and no significant differences were observed between these treatments and the others. The T5 diet resulted in a higher ratio of villus height: crypt depths in the jejunum compared to T2. In relation to the microbial diversity of the cecal content, the relative abundance (% of OTUs) for the Firmicutes, Actinobacteria and Proteobacteria phylae independent of the treatment were observed at phylum level. While at the family level the greatest abundance was for Lactobacillaceae, Steptococcaceae and Clostrideacea. Growth pigs rations with reduction of 100 kcal/kg of ME and supplemented with xylanase, probiotic and simbiotic resulted in similar performance compared with the results of pigs receiving reference ration. The xylanase plus probiotic improved the feed convertion compared to the energetic reduction diet without these additives. The xylanase and symbiotic combination prooted the biggest villus height:crypth depth ratio. The joint use of xylanase and probiotic results in best economic efficiency and best cost ratio