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采用粪便毛蚴孵化法筛选自然感染血吸虫病水牛,考察30%吡喹酮注射液对水牛血吸虫病的临床治疗效果。在实验性临床试验中,将自然感染血吸虫病水牛随机分为5组,分别为吡喹酮注射液高(20 mg/kg)、中(10 mg/kg)、低(5 mg/kg)剂量组,吡喹酮片组(30 mg/kg)和阳性对照组(不用药组)。给药30 d后,吡喹酮注射液高、中、低剂量组及吡喹酮片组的粪便毛蚴孵化转阴率分别为100.0%、100.0%、77.8%和85.7%。在扩大临床试验中,将自然感染血吸虫病水牛随机分为2组,分别为吡喹酮注射液推荐剂量组(10 mg/kg)和吡喹酮片组(30 mg/kg),给药30 d后,吡喹酮注射液组的52头患牛的粪便毛蚴孵化转阴率为100%,吡喹酮片组的6头患牛的粪便毛蚴孵化转阴率为100%。研究结果表明,30%吡喹酮注射液对水牛血吸虫病具有良好的治疗效果,给药方便,可以替代传统内服片剂,临床推荐剂量为10 mg/kg。 相似文献
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提高种蛋的孵化率,获得优质的雏鸡是每一个孵化厂的目标.而家禽的孵化技术是种禽饲养的关键环节,温度、相对湿度和通风换气等条件均会影响种蛋的孵化.本文围绕相对湿度这一孵化条件,研究其对种蛋孵化的影响以及如何在生产中控制好相对湿度,旨在为孵化厂的管理人员提供参考,促进孵化厂的高效化和集约化. 相似文献
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张晓红 《畜牧兽医科技信息》2012,(8):100-101
鹅种蛋孵化是发展鹅生产的关键环节,是养鹅生产的基础.鹅种蛋孵化率的高低与种蛋的合格率、受精率、种蛋所处的微环境、孵化条件等密切相关.只有选择、收集、保存好种蛋,尽早对种蛋进行消毒,抓好孵化中温度、湿度、通风、卫生和孵化场的日常管理等几个关键环节,全面考虑影响鹅种蛋孵化率的因素,提高孵化技术,才能提高鹅种蛋的孵化率. 相似文献
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《中国家禽》2016,(23)
为研究不同贮存期及贮存期内热处理对海兰褐父母代种蛋孵化指标的影响,将来源相同的种蛋分别贮存1、2、3、4……17 d,其他贮存条件相同。孵化后,分析其孵化指标,包括活胚率、死胚率、毛蛋率、健母雏率和蛋雏比等。另外,对贮存12~17 d和10~20 d的种蛋在入孵前一天进行热处理,孵化后分析其孵化指标。结果显示:贮存时间过短(1~2 d)和过长(9~17 d)都会影响种蛋的孵化。在贮存期热处理可提升蛋鸡种蛋的孵化指标,尤其是对贮存10~20 d的种蛋。研究结果表明,对贮存时间超过10 d以上的种蛋采用贮存期预温刺激的方式可以有效提高种蛋的孵化率和正品率,对规模化孵化厅技术管理具有实际指导作用。 相似文献
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鹅种蛋保存与孵化过程中的温度调节 总被引:1,自引:0,他引:1
鹅种蛋的孵化技术是在鹅品种、环境、营养、健康状况等因素外,能够通过人为提高鹅繁殖效率的一种技术.因此,某种意义上说,种蛋孵化技术的高低,决定了孵化场的效益.健康的母鹅产出的合格受精蛋称为种蛋,受孵化器容积、种蛋数、入孵间隔等因素影响,种蛋不能第一时间直接进行入孵.因此种蛋在孵化之前的保存环节显得尤为重要,其中温度是最重要的因素.在随后种蛋的孵化过程中,温度是影响胚胎发育、调节孵化率高低最重要的因素.本文主要介绍鹅种蛋保存与孵化过程中温度的调节方法. 相似文献
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王玮 《畜牧兽医科技信息》2011,(5)
鸭种蛋的孵化率受到多种因素的影响,但在孵化设备与孵化技术日趋完善的条件下,种蛋的选择、孵化条件与现场常规应急处理等环节就成为影响孵化率的主要因素.现将鸭种蛋孵化的主要技术要点报道如下. 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:9,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