First report of bovine neosporosis in dairy cattle in Costa Rica
محفوظ في:
| المؤلفون: | , , , , , |
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| التنسيق: | artículo |
| تاريخ النشر: | 1998 |
| الوصف: | NEOSPOROSIS has recently been recognised as a major cause of abortion in dairy cattle worldwide (Barr and others 1990, Duff and Otter 1994, Boulton and others 1995). The disease is caused by the protozoan parasite, Neospora caninum, which is closely related to Toxoplasma gondii (Dubey and Lindsay 1993).Consequently, it may have a life cycle similar to T gondii, which is transmitted by ingestion of oocysts in the faeces of a definitive host or by oral or nasal exposure to tachyzoites or oral exposure to bradyzoites (Thurmond and others 1997). For N caninum, however, vertical transmission is the major mode of transmission (Anderson and others 1997). In Costa Rica, a retrospective study (1987 to 1993) on 23 dairy farms located in a tropical cloud forest ecosystem (Holdrige 1987) found an overall abortion rate of 7-6 per cent (515 abortions out of 6741 animals calving). Consequently, a prospective study on the same herds was planqed to determine the principal aetiological agents associated with abortion. |
| البلد: | Repositorio UNA |
| المؤسسة: | Universidad Nacional de Costa Rica |
| Repositorio: | Repositorio UNA |
| اللغة: | Inglés |
| OAI Identifier: | oai:null:11056/23003 |
| الوصول للمادة أونلاين: | http://hdl.handle.net/11056/23003 https://doi.org/10.1136/vr.142.19.520 |
| كلمة مفتاحية: | ENFERMEDADES PARASITARIAS DAIRY CATTLE GANADO BOVINO COSTA RICA PARASITIC DISEASES PARASITES PARÁSITOS |