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Mucosal surface area in chicken small intestine during development

M Mitjans¹, G Barniol, R Ferrer

¹Unitat de Fisiologia, Facultat de Farmàcia, Universitat de Barcelona, Av. Joan XXIII s/n, E-08028 Barcelona.

Cell and Tissue Research

|September 11, 1997

Summary

Chicken intestinal surface area significantly increases with age. The jejunum shows the greatest growth, expanding 20-fold by 12 weeks, enhancing nutrient absorption potential.

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Area of Science:

Avian physiology
Gastrointestinal morphology
Comparative anatomy

Background:

Understanding chicken intestinal development is crucial for optimizing nutrition and growth.
The mucosal surface area directly impacts nutrient absorption efficiency.

Purpose of the Study:

To quantify the changes in mucosal surface area of the chicken duodenum, jejunum, and ileum during development.
To analyze the contributions of villus and microvillus structures to total surface area expansion.

Main Methods:

Morphometric analysis at macroscopic, light-microscopic, and transmission electron-microscopic levels.
Determination of nominal (serosal) surface area using intestinal length and perimeter.
Estimation of villus and microvillus amplification factors.

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Main Results:

Nominal surface area increased 6.5- to 7.2-fold across all segments.
Villus amplification factor varied, with a notable increase in the jejunum (2-fold).
Microvillus amplification increased by 1.5-fold (duodenum/jejunum) and 1.2-fold (ileum), with an initial decrease in the first week.

Conclusions:

Total mucosal surface area increased 12- to 13-fold in the duodenum/ileum and 20-fold in the jejunum by 12 weeks.
Significant developmental changes in intestinal morphology contribute to enhanced absorptive capacity in chickens.