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Vitamin A deficiency induces morphometric changes and decreased functionality in chicken small intestine
1Department of Animal Science, Faculty of Agriculture, Food and Environmental Quality Sciences, Hebrew University of Jerusalem, Rehovot, Israel. Uni@agri.huji.ac.il
The British Journal of Nutrition
|January 30, 1999
Summary
Vitamin A deficiency significantly impacts chicken intestinal health, altering cell structure and enzyme function. Supplementation quickly restores intestinal mucosal activity and morphology.
Area of Science:
- Animal Science
- Nutritional Biochemistry
- Avian Physiology
Background:
- Vitamin A is crucial for animal health and development.
- Chickens exhibit rapid physiological responses to dietary deficiencies.
- Intestinal morphology and function are key indicators of nutrient status.
Purpose of the Study:
- To investigate the effects of vitamin A deficiency and repletion on chicken intestinal mucosal morphology and function.
- To compare the response of chickens to vitamin A deficiency with that of other species.
- To elucidate the specific cellular mechanisms affected by vitamin A deficiency in the chicken intestine.
Main Methods:
- Induction of severe and mild vitamin A deficiency in chickens.
- Assessment of biochemical parameters including mucosal protein, RNA:DNA, RNA:protein, and protein:DNA ratios.
- Morphological analysis of intestinal villus height, crypt depth, and enterocyte counts.
- Measurement of intestinal enzyme activities (disaccharidases, transpeptidase, alkaline phosphatase).
- Evaluation of vitamin A repletion effects on intestinal parameters.
Main Results:
- Severe vitamin A deficiency led to significant alterations in chicken small intestine morphology and biochemistry.
- Deficiency reduced mucosal protein, villus height, crypt depth, and key enzyme activities.
- Vitamin A deficiency influenced enterocyte proliferation (hyperplasia) and maturation (hypertrophy).
- No significant difference in enzyme activity was observed between mild and severe deficiency groups.
- Vitamin A repletion rapidly restored mucosal enzyme activity within 4 days.
Conclusions:
- Vitamin A deficiency profoundly impacts chicken intestinal mucosa, affecting both cellular structure and biochemical functions.
- The findings highlight the critical role of vitamin A in regulating enterocyte proliferation and maturation.
- Rapid recovery of enzyme activity upon repletion underscores the dynamic nature of intestinal adaptation to vitamin A status.