Morphological Alterations of the Duodenal Villi in Chicks Refed Rice Bran or Grower Mash after Fasting.
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概要
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To investigate the effects of form and nutrition of diets for refeeding on the recovery of villi in fasted chicks, 42-day-old male White Leghorn chicks were fed rice bran (CP: 16.8%, ME: 3, 170 kcal/kg) or grower mash (CP: 18%, ME: 2, 850 kcal/kg) diets for 3, 6 or 24 hours after fasting for 10 days. After the end of each experimental period, duodenal villus height, cell area of the epithelial cells, cell mitosis in the crypt and lamina propria were compared using light microscope. Besides, surface of the villus apex was observed using scanning electron microscope.By refeeding for 3 and 6 hours, the decreased villus height, cell area and cell mitosis in fasted chicks showed a faster recovery in rice bran group than that in grower mash group. Broad lamina propria with diffused histological components such as smooth muscle fiber, blood capillary and various kinds of cells in fasted chicks became narrow by refeeding in both groups. Rice bran group showed a narrower lamina propria than grower mash group but the latter had more activated histological components. Smooth surface of the villus apex in fasted chicks changed to a much activated rough surface by many protuberated cells in rice bran group.By refeeding for 24 hours, the villus height, cell area and cell mitosis in grower mash group more developed than rice bran group. Lamina propria showed a broad propria with undeveloped histological components, especially, undeveloped smooth muscle fibers, in rice bran group. In grower mash group, narrow lamina propria was rich in histological components such as developed smooth muscle fibers and at the villus apex cell extrusion was frequently observed. Villus apex showed the more developed protuberances of epithelial cells in grower mash group.These morphological alterations indicate that for the first recovery stage of villi after fasting the quickly absorbable form such as powdered diet is important rather than the nutrition of it, and that for further complete recovery stage of villi the nutritious and well-balanced diet is important.
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