Absorption of short-chain fatty acids, sodium and water from the forestomach of camels
| Autor: | M. Lechner-Doll, Ch. Dycker, W. von Engelhardt |
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| Rok vydání: | 2007 |
| Předmět: |
Male
Absorption (pharmacology) Camelus Absorption of water Physiology Sodium chemistry.chemical_element Models Biological Biochemistry Foregut fermentation Endocrinology medicine Animals Food science Ecology Evolution Behavior and Systematics chemistry.chemical_classification Ion exchange Chemistry digestive oral and skin physiology Water food and beverages Fatty Acids Volatile Epithelium medicine.anatomical_structure Intestinal Absorption Gastric Mucosa Propionate Female Animal Science and Zoology Orchiectomy Clearance rate |
| Zdroj: | Journal of Comparative Physiology B. 177:631-640 |
| ISSN: | 1432-136X 0174-1578 |
| Popis: | In camelids the ventral parts of compartments 1 and 2 (C1/C2) and the total surface of compartment 3 of the forestomach are lined with tubular glands, whereas in ruminants the surface of the forestomach is composed entirely of stratified, squamous epithelium. Thus, differences in absorption rates between these foregut fermenters can be expected. In five camels C1/C2 was temporarily isolated, washed and filled with buffer solutions. Absorption of short-chain fatty acids (SCFA) and net absorption of sodium and water were estimated relative to Cr-ethylenediaminetetraacetic acid as a fluid marker. SCFA were extensively absorbed in the forestomach; clearance rates of SCFA with different chain lengths were equal. After lowering the pH of solutions SCFA absorption rates increased, but much less than the increase of the non-ionized fraction. Absorption of propionate was lower when acetate had been added. Findings suggest that most of the SCFA in camels are transported in the ionized form, most likely via an anion exchange mechanism. Net water absorption is closely related to net sodium absorption. Apparently water absorption results from an iso-osmotic process. Differences between absorption mechanisms of SCFA from the forestomach of camelids and ruminants are discussed. |
| Databáze: | OpenAIRE |
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