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呼和浩特地区牛皮蝇蛆病的流行病学调查 总被引：3，自引：0，他引：3
在呼和浩特地区牛皮蝇蛆病的病原是牛皮蝇(Hypoderma bouis)和纹皮绳（H.lineatum)。该病流行的高峰期是5～7月，其中5月中旬至6月中旬显最高峰。蒙古感染率高，平均感染率为83.33%，平均感染强度为2.34条/头；黑白花牛感染率低，平均感染率为0.52%，感染强度为2.00条/头。引起当地牛皮蝇蛆病流行的主要原因除与当地的自然、地理条件及宿主因素密切相关外，还与该地区缺乏有效的防治措施有一定的关系。 相似文献
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一、防治前的调查:我县防治牛皮蝇病已历时4年,防治前的1983年3月和5月两次对全县12个乡39个点进行了,45次调查,检查牛4519头,感染率为63.44％,感染强度6.8个,感染范围0—148个。二、防治效果的调查:每年10月10日到11月上旬用倍硫磷肌肉注射防治牛皮蝇,翌年的3—5月份进行防治效果考核。4年共抽查牛10391头(次),平均感染率为23.35％,感染强度0.99,范围0—68个, 相似文献
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周克加 《青海畜牧兽医杂志》1987,(2)
海晏县的牛皮蝇幼虫未防治前的感染率为85.17％,感染强度为11.5个。从1983年起连续三年用倍硫磷肌肉注射防治,到1985年考核时,感染率为10.09％,感染强度为0.33个。1985年停止注射倍硫磷。现以1985和1986两年的3、5月份青海湖乡莫湘滩停_}上注射一年后牛皮蝇幼虫的感染情况调查材料(详见表1、2)进行对比分析,提 相似文献
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经过连续数年防治,用不同剂量的阿维菌素透皮溶液防治牦牛皮蝇蛆病,试验组1防治牦牛137头,感染0头,感染率为0,驱净率100%;试验组2防治牦牛180头,感染0头,感染率为0,驱净率100%;试验组3牦牛128头,给予安慰剂,自然感染24头,感染率为18.75%,平均感染强度1.71个。应用推荐剂量的1/2和1/4防治牦牛皮蝇蛆病,效果显著。结论:牛皮蝇自然感染回升快,防治工作要长期坚持。 相似文献
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牛皮蝇蛆病是危害牛只的主要外寄生虫之一,在牧区自然放牧条件下,流行尤为严重。由于皮蝇幼虫的寄生,可使牛只消瘦,幼畜生长发育受阻,畜产品的数量和质量降低,造成很大的经济损失。据我州1981年3月份调查,同仁地区牛皮蝇病犊牛感染率为91.5％,平均感染强度为11.9个;幼年牛感 相似文献
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Reid WA 《Journal of veterinary medical education》2007,34(4):390-395
In the United Kingdom, the medical students of yesteryear undertook a detailed pathology course, often with its own major examinations. This contributed to the increasing overload of factual information that was common in medical curricula. Following General Medical Council reports on medical education, pathology is now more fully integrated into clinical work and into problem-based learning, albeit with greatly reduced contact time with pathologists. Teaching methods have shifted from didactic presentations, such as lectures, to more varied methods, with emphasis on self-access and interactivity. Technological advances have brought well-illustrated textbooks, computer-assisted learning programs, Web resources, and electronic communication. There has been a decline in the role of museum specimens, microscopy, and, partly following a worldwide trend and partly following adverse media publicity, the traditional autopsy. Assessment methods have evolved, with integration of pathology into wider examinations. The greater drive toward increasing funding through the Research Assessment Exercise has had an adverse effect on teaching throughout universities. Despite these setbacks, the importance of pathology as a clinical discipline will ensure its continued role in medical education. 相似文献
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In a 4-year period nine dogs have been met in which there was incomplete growth of the radius. The condition was unilateral in eight dogs and bilateral in one. Two were littermates. The defect is due to premature cessation of growth of the distal growth plate of the radius but the cause of this is not precisely known. It is recognized by characteristic radiographic changes in radius length, elbow joint space and premature closure of the distal growth plate of the radius. A method of surgical treatment has been devised and has proved beneficial in five dogs. Zusammenfassung. In einer Vierjahresperiode wurden neun Hunde beobachtet, bei denen ein unvollständiges Wachstum des Radius vorlag. Bei acht Hunden war der Zustand nur auf einer Seite zu finden, bei einem Hund auf beiden Seiten. Zwei der Hunde gehörten zum gleichen Wurf. Der Mangel ist auf verfrühte Wachstumseinstellung der distalen Wachstumsplatte des Radius zurückzuführen, jedoch ist die Ursache davon nicht genau bekannt. Er wird an charakteristischen radiographischen Veränderungen der Radiuslänge, des Ellbogengelenkzwischenraums und vorzeitigem Abschluss der distalen Wachstumsplatte des Radius erkannt. Es wurde eine chirurgische Behandlungsmethode entwickelt, die sich bei fünf Hunden als nutzlich erwies. Résumé. Au cows d'une période de 4 ans on a observé 9 cas de croissance incomplète du radius chez des chiens; l'anomalie était unilatérale dans 8 cas et bilatérale dans un cas; deux chiens appartenaient à la même portée. L'anomalie est due à l'arrêt prématuré de croissance de la plaque de croissance distale du radius, mais la cause n'en est pas encore connue d'une manière précise. Le diagnostic se fait par les signes radiologiques caractéristiques, modifications de la longueur du radius, de l'articulation du coude et soudure prématurée de la plaque de croissance du radius. On a élaboré une méthode de traitement chirurgical, qui s'est montrée favorable chez 5 chiens. 相似文献
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Evidence for the non-involvement of the uterus in the lifespan of the corpus luteum in the cyclic dog 总被引：1，自引：0，他引：1
Progesterone levels in peripheral blood of dogs were analysed during the cycle in which hysterectomy (n = 5) or sham surgery (n = 3) was performed as well as during the cycle of dogs (n = 5) hysterectomized at least one year prior to this study; the data were compared with the findings in control dogs (n = 3). The averages of the duration of the luteal period observed in the three experimental groups were not significantly different from those of control dogs. Immediately after surgery, the progesterone level decreased from 25 to 50% of the presurgical level, but returned to presurgical level in about four days. Prolactin levels were elevated for about 30 h after surgery. Nevertheless, the averages of the mean prolactin levels for each animal during the luteal period of the experimental groups were not significantly different from those of control dogs. It is concluded that in the dog, the uterus is not involved in the lifespan of the cyclic corpus luteum. 相似文献
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国内生态恢复研究进展 总被引：10，自引：1，他引：9
本文介绍了生态恢复的研究进展,从生态恢复的定义、退化生态系统的指标等方面进行阐述,重点对国内在恢复生态学方面的进展做了介绍。对当前的人工草地、草地农业的研究情况做了一些概述。 相似文献