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Bovine feedlots are intensive production systems of significant importance in Mexico. The present study describes the presence of bovine virus diarrhea (BVD) causing subacute to chronic lesions in feedlot cattle, associated with other pathologies. Animals included in this study were discarded after they received therapy several times due to chronic pneumonia, or anaplamosis. Bovine virus diarrhea antigen was identified by immunohistochemistry in small intestine and myocardium in six cases of chronic suppurative bronchopneumonia with extensive areas of casseous necrotic bronchiectasis, previously diagnosed as Mycoplasma bovis pneumonias (retrospective group, n = 6). Furthermore, based on characteristic histopathologic lesions other nine cases were included (prospective group, n = 9). Bovine virus diarrhea antigen was recognized in two animals with pneumonic lesions, including a case with fibrinous bronchopneumonia as well as suggestive lesions of infectious bovine rinotracheitis (1/9), and another one with suppurative bronchopneumonia and myocarditis suggestive of Histophilus somni (1/9). In addition, one positive case was associated to anaplasmosis (1/9). Other two positive cases showed a conspicuous fibrinous peritonitis (2/9). The rest of the animals in this group resulted negative (4/9). Histopathological characteristics of the lesions and their association with the antigen in situ confirm the presence of BVD. This presentation is compatible with the acute infection syndrome. This is the first report of BVD infection and concomitant pathologies in feedlot cattle in Mexico. [ABSTRACT FROM AUTHOR]

History of diseases, clinical manifestations, pathologic and histopathological findings, as well as the results of complementary studies of three animals considered representatives of an outbreak of mortality in beef cattle in a ranch located in Aldama, Tamaulipas, during the first trimester of the 2008 are presented. Babesiosis and paralytic rabies were the presumptive diagnosis in two cases. Both diseases are considered enzootic in this area. Laboratory studies demonstrated that rabies was the main problem (3/3); however, in two of them (2/3) also Babesia bovis was recognized. In enzootic areas, the presence of both diseases, bovine paralytic rabies and babesiosis, occurs simultaneously making diagnosis difficult. [ABSTRACT FROM AUTHOR]

Se presentan los antecedentes, las manifestaciones clínicas, los hallazgos patológicos e histopatológicos, así como los resultados de los estudios complementarios de tres animales representativos de un problema de mortalidad en ganado de carne en un rancho localizado en el municipio de Aldama, Tamaulipas, durante el primer trimestre de 2008. El diagnóstico presuntivo en dos casos fue babesiosis y en el otro fue rabia. La zona es considerada endémica para ambas enfermedades. Los resultados demostraron que el problema primordial fue rabia (3/3); sin embargo, en dos de ellos (2/3) también se registró la presencia de Babesia bovis. En zonas endémicas, la presencia de ambas enfermedades, rabia paralítica bovina y babesiosis ocurre simultáneamente haciendo difícil el diagnóstico. [ABSTRACT FROM AUTHOR]

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Osteochondrosis (OC) is a term used to describe a wide range of different skeletal lesions between different species. Osteochondrosis is a problem that affects fast growing animals and it has been defined as a failure in the endochondral ossification of the articular-epiphyseal cartilage. This failure leads to cartilage thickening and retention, basal necrosis, subchondral bone damage and loose bone fragments in the articular joint. Osteochondrosis is a multifactorial disease in which nutritional, hereditary, endocrine factors, biomechanical influences, and failures of blood supply to growth cartilage play an important role. The aim of this review is to offer an updated approach to the knowledge of the mechanisms that intervene in the pathogenesis of osteochondrosis, as well as alternatives to its diagnosis and treatment. [ABSTRACT FROM AUTHOR]

Cystic-like structures similar to xenomas containing ovoid or piriform organisms were observed in brain and kidney of a one-month-old rabbit. Different dyes such as H&E, PAS, toluidine blue and trichrome blue were tested. Trichrome blue yielded the best results in terms of specificity, resolution and confirmation of microsporidia spores. This dye is easily adaptable to paraffin-embedded samples by not requiring additional equipment; it is rapid, cheap and could be used as a confirmatory technique for other microsporidiosis. [ABSTRACT FROM AUTHOR]

Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Se describe un caso de miositis osificante localizada en un perro de raza Weimaraner, macho, de ocho años de edad. El animal fue originalmente remitido con diagnóstico presuntivo de hernia. La lesión era un nódulo subcutáneo firme con 5 cm de largo por 3 cm de ancho, localizada en los músculos del perineo derecho. Después del estudio radiológico la lesión fue interpretada como una neoplasia originada de vértebras coccígeas. Su dureza se constató durante el procedimiento quirúrgico para eliminar la neoformación. La lesión se extirpó parcialmente y la muestra se remitió a patología. La masa era dura, bien delimitada, vascularizada y con tejido muscular a su alrededor. El estudio histopatológico reveló osificación heterotópica con zonas de atrofia, degeneración y necrosis muscular, alternando con zonas de osificación trabecular en la periferia, limitadas por abundante tejido conectivo fibroso. Estos hallazgos son característicos de la miositis osificante localizada. Este caso constituye el primer informe de esta condición patológica en un perro en México, similar a la miositis osificante localizada en humanos [ABSTRACT FROM AUTHOR]

A case of myositis ossificans circumscripta in an eight-year-old, male, Weimaraner dog, is described. The animal was originally submitted with presumptive diagnosis of hernia. The lesion was a firm, subcutaneous nodule, 5 cm long by 3 cm width, localized in the right perineum muscles. After the radiologic study the lesion was interpreted as a neoplasm from coccygeal vertebrae. The surgical procedure to eliminate the neoplastic tissue confirmed its hardness. Excision was not complete and the sample was submitted to pathology. The mass was hard, well circumscribed, vascularized and surrounded by muscle tissue. The histopathological study revealed a heterotopic ossification with zones of atrophy, degeneration and muscle necrosis, alternating with zones of trabecular ossification toward the periphery, limited by abundant fibrous connective tissue. These findings are characteristic of myositis ossificans circumscripta. This case represents the first report in a dog in Mexico, of a condition resembling the myositis ossificans circumscripta in humans. [ABSTRACT FROM AUTHOR]

The multilobular tumor of bone (MTB) is considered as a slow-growth malignant tumor, which generally occurs on the cranium and facial bones of dogs, although it has been reported in other domestic animals. This study presents two cases of MTB in dogs. The first case was manifested in an 8-year-old male Bull Terrier, while the second one affected a 5.5-year-old female German Shepherd. Both animals were submitted for post-mortem examination. MTB diagnosis was confirmed by histopathological examination. The aim of this report was to describe the main clinical-pathologic features of MTB, such as its slow, diffuse and deforming growth pattern, as well as the histomorphological image peculiarities that are unmistakable from other tumors such as chondrosarcoma and osteosarcoma, that should be considered as differential diagnoses. Up to date, this is the first report of canine MTB in Mexico. [ABSTRACT FROM AUTHOR]

Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Veterinaria México is the property of Facultad de Medicina Veterinaria y Zootecnia UNAM and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)