Évolution nycthémérale des produits de la fermentation bactérienne dans le tube digestif du lapin en croissance. Relations avec la teneur en lignines de la ration

Open Access
Publisher Website
Google Scholar
Abstract
Three groups of 36 young rabbits were fed ad libitum diets containing 7 to 17 p. 100 lignin Van-Soest (table 1). After slaughter of the animals every three hours over a 24-h period, VFA, ammonia nitrogen and lactate were determined in 4 different sites of the digestive tract: stomach, ileum (terminal), caecum and rectum. The lignin content of the experimental diets did not affect the concentrations (table 2) or the proportions (table 3) of caecocolic fermentation products. Ammonia concentration was high in the ileum (38.8 mM/l) and caecum (24.8 mM/l). It increased in the rectum as affected by caecotrophy (table 7), but did not change during the 24-h cycle in the other collection sites. VFA concentrations were maximum in the rectum and caecum (50-100 mM/l). Acetate was the major volatile fatty acid (70-90 p. 100), followed by butyrate (5-16 p.100) and propionate (0-6 p. 100). During caecotrophy, the total VFA concentration (fig. 1) decreased in the caecum and increased in the stomach and rectum. Caecotrophes collected in the rectum exhibited a higher butyrate concentration than hard faeces and a lower acetate concentration (fig. 3, stomach, rectum).

This publication has 5 references indexed in Scilit: