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Study on Pulmonary Alveoli Microstructure in Different Developmental Stage of Plateau Yak and Plain Yellow Cattle

Author: WeiQing
Tutor: YuHongXian
School: Qinghai University
Course: Animal Nutrition and Feed Science
Keywords: Yak Plain cattle Development Alveolar microstructure Altitude hypoxia Suitability
CLC: S823
Type: Master's thesis
Year: 2007
Downloads: 84
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Abstract

In this study, to learn from the developmental point of view, the use of light microscopy and computer image acquisition and analysis system for different developmental stages (1 day old lt; within 12h after birth gt;, 30 days, 180 days and adult) with a quarter of a wild blood Datong yak (altitude 3800 ~ 4800m) with the same developmental stage plain cattle (below 500m above sea level) alveoli and alveolar septum microstructure morphology were observed and measured. The results showed that: 1. Yak from birth to adulthood, with increasing age single alveolar area (MSAA) has been an increasing trend; But the number of alveoli per unit area increases with age gradually decreased among all age groups significant difference (P lt; 0.05). 30 age group, the thickness of alveolar septa (MAST) max (P lt; 0.05), alveolar septal cell components within the most obvious; 1-day-old group, the thickness of alveolar septa (MAST) thinnest (P lt; 0.05); 180 days alveolar septum thickness greater than one day old (P lt; 0.05), and less than 30 days old and adult (P lt; 0.05). 30 days of age per unit area of ??the alveolar area (SA) Min (P lt; 0.05), the other three groups were not significantly different (P gt; 0.05). Yak an age when a lot like lung tissue seen in cystic alveolar structure, there are many short secondary capsule compartment. 2 plain cattle age increase their individual alveolar area (MSAA) is also increasing; unit area of ??alveolar number (MAN) correspondingly decreased; while the thickness of the alveolar septa (MAST) is also 30 days maximum ( P lt; 0.05), 1-day-old group thinnest (P lt; 0.05), but the 180-day-old and adult alveolar septum thickness plain cattle difference was not significant (P> 0.05); cellular components within the alveolar septa in 30 days group performance is the most obvious; unit area of ??the alveolar area (SA) was significantly greater than other adult age group (P lt; 0.05), 1 days, 30 days and 180 days of age difference between groups was not significant (P> 0.05) . At 30 days of age subpleural regions of the lung tissue shows a large cystic alveolar like structures sac, there are many short secondary compartment exists. 3 Comparison of the same developmental stage yak and plain cattle, one-day-old and 30-day-old group yak unit area of ??the alveolar number (MAN) is smaller than plain cattle (P lt; 0.05), and a single alveolar area (MSAA ) than plain cattle (P lt; 0.05), while the 180-day-old and adult yaks and cattle was no significant difference in the corresponding values ??(P gt; 0.05); addition to 180-day-old group, the other developmental stages yak alveolar septum thickness ( MAST) are thicker than plain cattle corresponding values ??(P lt; 0.05); unit area of ??the alveolar area at 30 days of age and adult yak and plain cattle was not significantly different (P gt; 0.05), but the one-day-old and 180 age group than plain cattle yak corresponding values ??(P lt; 0.05). Yak and plain cattle lung tissue seems to have emerged a large number of cases of alveolar cystic structures, inclusive of many short intracapsular \But yak an age group had already appeared, and the distribution in the whole lung; rather plain cattle group appears in the 30-day-old group, visible only in the subpleural region. Conclusion: yak postnatal development of the alveolar process and the way there are many similarities with the plain cattle: birth alveoli are more fully developed, with good respiratory function. 30 days of age have a developmental reserve alveolar stage. With the development of both alveolar and the corresponding self-expansion, performance of a single alveolar area increasing. And has a through the \But more yak and plain cattle postnatal development of alveoli, alveolar plateau yak after birth, there are adaptation to high altitude hypoxia morphological characteristics: ①. Yak an age group showing the full expansion of the alveoli that yak after birth to adapt to low oxygen environment, from the perspective of respiratory physiology lungs will have a rapid respiratory rate, respiratory depth larger process. Alveolar full expansion that will help the whole lung respiratory function, to meet the body's oxygen needs; ②. Yak alveolar postnatal development than plain cattle early in the yak a similar age group, you can see a large number of alveolar cystic structure, But in plain cattle to 30-day-old group is visible, indicating that the rapid growth of the alveolar plateau yak before and after birth, while the plain cattle in 30 days or so; ③. except in the developmental transition phase 180 days old yak, other ages Groups alveolar septa were thicker than plain cattle, the corresponding capillaries and alveolar septa elastic fiber content should be rich, yak provides a good adaptation to high altitude hypoxia histological basis.

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