The Guts histostructural of one-month and two-month piglets
1993
Kuebar, H. | Nahkur, E.-L. (Estonian Agricultural Univ., Tartu (Estonia))
The guts histostructure of 5 one-month and 5 two-month piglets has been studied. The results of study are following: 1. By scanning electron microscope in the surface epithelium of jejunal villus we can distinguish the goblet cells, which are bright and the cells, covered with microvilli. 2. By transmissive electron microscope appears, that the structure of absorptive cells depends on the time of nursing. Some hours after the nursing the cytoplasm was full of vacuoles, but 12 hours after nursing it contained only few pinocytotic vesicles. 3. By light microscope we have established, that the thickness of dome epithelium of two-month piglets is considerably smaller (20.5 microm) than the thickness of absorptive epithelium (29.7microm). But the number of lymphocytes is in dome epithelium greater (49.7 lymphocytes per 100 epithelial cells) than in the absorptive epithelium (31.3 lymphocytes per 100 epithelial cells). 4. The difference in goblet cells number of glandular epithelium in small and large intestine is not statistically true. 5. When the goblet cell is filled up with secretion, then we can see many large mucous granules in the cytoplasm; but when the goblet cell is empty, there are only few mucous granuleg in the central part of cell and in apical part of the cell there is a groove, surrounded by thin layer of cells cytoplasm. 6. Per 1000 epithelial cells we have counted on the average 2.2 mitoses. Regarding that a mitosis lasts one hour, then the regeneration of all of epithelium of piglets gut takes about 19 days. 7. The amount of lymphoid tissue (aggregated lymphoid nodules) is the greatest in ileum. In transverse section of piglets ileum lymphoid tissue occupied 40%. In other parts of the gut the aggregated lymphoid nodules are smaller and occupied about 2% (in duodenum, caecum and rectum), 6% (in colon) or 11% (in jejunum)
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