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首页> 外文期刊>Tropical Animal Health and Production >Leptospirosis in sheep and goats under tropical conditions.
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Leptospirosis in sheep and goats under tropical conditions.

机译：热带条件下绵羊和山羊的钩端螺旋体病。

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摘要

Inadequate management practices and poor reproductive performance have been reported as fundamental factors on reducing the levels of productivity in livestock. Different pathogens have been reported in small ruminants' herds/flocks with reproductive failures. The aim of the present study was to review aspects of leptospirosis in small ruminants, mainly its impact on reproduction and consequently on productivity of the herds/flocks under tropical conditions. Leptospiral infection in goats and sheep is common in several countries, and those species can also act as carriers of leptospires. Severe disease is often associated to young animals and is frequently associated to incidental serovars. In contrast, subclinical infection is mainly characterized by reproductive problems, such as infertility, abortion, occurrence of stillbirths, and weak lambs/goat kids. Moreover, laboratorial tests are essential to achieve an accurate diagnosis of the infection. Microscopic agglutination test is the most common indirect test of leptospirosis, being used worldwide. In small ruminants, PCR consists on a recommendable method for diagnosing animals that carry leptospires. Control of leptospirosis in small ruminants involves measures such as the identification and treatment of the carriers and other sources of infection, quarantine in acquired animals, and systematic immunization with commercial vaccines containing the circulating serovars in the herd/flock. Productivity of small ruminant breeding can dramatically increase with adequate sanitary conditions and control of leptospirosis. Immunization of all the animals combined to the treatment of carriers may successfully control the infection and importantly reduce the economic reproductive hazards that are observed under tropical conditions.
机译：据报导，管理不善和生殖性能差是降低牲畜生产力水平的根本因素。在小反刍动物的羊群/羊群中报告了不同的病原体，它们的繁殖能力很差。本研究的目的是综述小型反刍动物中钩端螺旋体病的各个方面，主要是对繁殖的影响，进而对热带条件下牛群/群的生产力的影响。山羊和绵羊的钩端螺旋体感染在几个国家很常见，这些物种也可以作为钩端螺旋体的携带者。严重的疾病通常与年幼的动物有关，经常与偶然的血清病毒有关。相反，亚临床感染的主要特征是生殖问题，例如不孕，流产，死产和羔羊/山羊羔等。此外，实验室测试对于实现感染的准确诊断至关重要。显微镜凝集试验是钩端螺旋体病最常见的间接试验，在世界范围内使用。在小型反刍动物中，PCR是一种诊断携带钩端螺旋体动物的推荐方法。小型反刍动物钩端螺旋体病的控制包括以下措施：识别和治疗携带者及其他感染源，隔离获得性动物，以及使用在畜群/群中含有循环血清的商业疫苗进行系统免疫。适当的卫生条件和钩端螺旋体病的控制，可使小型反刍动物繁殖的生产率大大提高。结合载体的治疗对所有动物进行免疫可成功控制感染，并重要地减少热带条件下观察到的经济生殖危害。

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