ArticleAnimal nutrition (Zhongguo xu mu shou yi xue hui)2025
Revealing the physical restrictions of caecal influx in broilers through the use of solid and soluble markers.
Article in Animal nutrition (Zhongguo xu mu shou yi xue hui), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- In vitro study on the role of endoxylanase-driven fibre solubilisation and fibre particle size in improving fibre fermentation in broilers.Poultry science · 2026Article
- Extensive particle size reduction of wheat bran increases the broiler's caecal fermentative capacity, but not bran fermentability ex vivo.Poultry science · 2026Article
- Milled and cryogenic micronised wheat bran inclusions stimulate fibre degradation and fermentation differently throughout the broiler's gastrointestinal tract.Poultry science · 2026Article
- Impact of the particle size of wheat bran inclusions in feed on the precaecal gastrointestinal tract fibre particle size distribution, caecal digesta particle size and caecal fibre fermentation in young and growing broilers.Animal nutrition (Zhongguo xu mu shou yi xue hui) · 2026Article
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8 authors.
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Abstract
A promising strategy to support broiler health and performance in a sustainable way is the enhancement of microbial fibre fermentation in broilers. This fermentation mainly occurs in the caeca, but the actual particle size range that allows caecal influx has not yet been described. This study aimed to understand the physical limitations of caecal influx as a function of broiler age by using both solid and soluble markers. In the first trial, the caecal filter mechanism was studied by microscopically visualising the caecal entrance and measuring caecal lobe development and digesta particle size as a function of age (d 8-36) for 44 broilers (Ross 308) receiving a conventional wheat-based diet. In two consecutive trials, microcrystalline cellulose beads (100-700 μm) and a combination of fluorescent polystyrene beads (5-30 μm) and chromium-ethylenediamine tetraacetic acid (Cr-EDTA) were administered to 176 and 189 broilers, respectively, at different ages (d 8-36). Results showed that the actual caecal entrance diameter is significantly reduced due to a dense villi network acting as a filter for digesta inflow. This explains the size gap between the average digesta particle size (D50) of the ileum (451-322 μm) and caeca (5-19 μm), and the outer diameter of the caecal entrance (2000-4000 μm) on d 8 to 36. In contrast to the caecal D50, cellulose beads of 700 μm already entered the caeca at 8 d of age, even though the general caecal influx of digesta particles larger than 100 μm seemed very limited. The caecal influx of the markers further exhibited large individual variation among birds. A maximum of 13.2% (d 9) and 4.3% (d 29) of the total administered soluble marker (Cr-EDTA) was detected in the caeca, 5 h after bolus administration. Both solid and soluble markers showed a larger concentration in the caeca at a young age compared to older ages (
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