Soluble non-starch polysaccharide modulates broiler gastrointestinal tract environment.
Poult Sci
; 100(8): 101183, 2021 Aug.
Article
em En
| MEDLINE
| ID: mdl-34198096
ABSTRACT
The aim of this study was to evaluate the importance of considering dietary soluble non-starch polysaccharides (sNSP) when formulating broiler diets, due to their impact on the gastrointestinal tract environment. Cobb 500 broilers (nâ¯=â¯480, 80 birds per treatment) were fed either wheat- or corn-soybean meal-based diets formulated to contain either a high, medium or low sNSP content, resulting in 6 dietary treatments in a 2â¯×â¯3 factorial arrangement of treatments. On d14 and d 35 of age, pH of the gizzard, ileum and caeca, ileum viscosity, caecal short chain fatty acid (SCFA) concentration, and ileal and caecal microbiota profile were determined. Ileal viscosity at d 35 was greater in birds fed high sNSP compared to low sNSP (Pâ¯=â¯0.022). At both d 14 and d 35, birds fed the wheat-based diet presented higher ileal viscosity (P < 0.001) and lower ileal pH (Pâ¯=â¯0.027 and P < 0.001, respectively) compared to those fed the corn-based diet. At d 14, birds fed low sNSP exhibited higher caecal pH (Pâ¯=â¯0.010) and propionic, isobutyric and valeric acid concentrations (Pâ¯=â¯0.035, Pâ¯=â¯0.007 and Pâ¯=â¯0.011, respectively), and lower ileal Lactobacillus content (Pâ¯=â¯0.043), compared to birds fed high sNSP. This effect was also seen for total SCFA (Pâ¯=â¯0.017) and acetic acid (Pâ¯=â¯0.005) concentrations in the caeca at d 14, but only in birds fed wheat-, not corn-, based diets. At d 35, total caecal SCFA concentration was greater in birds fed the wheat-based diet with high sNSP level compared to those fed the corn-based diet with high or low sNSP level (Pâ¯=â¯0.028). In comparison to birds fed corn, birds fed wheat presented greater caecal concentrations of acetic, butyric, lactic, and succinic acids (Pâ¯=â¯0.001, P < 0.001, Pâ¯=â¯0.003 and Pâ¯=â¯0.007, respectively) and Bifidobacteria at d 35 (Pâ¯=â¯0.003) and succinic acid at d14 (Pâ¯=â¯0.041). However, caecal populations of Ruminococcus and concentrations of valeric acid at d14 and isobutyric acid at d 35 were greater in birds fed the corn- compared to wheat-based diets (Pâ¯=â¯0.043, Pâ¯=â¯0.019 and P < 0.001, respectively). These results illustrate that dietary sNSP concentration, as well as its composition, have a direct impact on gastrointestinal viscosity and pH, and fuel beneficial microbial species, resulting in production of SCFA. It appears to be particularly important to consider sNSP level when formulating wheat-based diets for broilers.
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Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ração Animal
/
Fenômenos Fisiológicos da Nutrição Animal
Limite:
Animals
Idioma:
En
Revista:
Poult Sci
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Austrália