RESUMO
The study reported in the present paper discusses the clinical and histological picture of bovine demodecosis and the morphology of Demodex mites as seen in four cows suffering from generalized demodecosis. There were no clinical signs of other skin affections. Changes in both the number and the appearance of visible skin lesions were seen and related to the level of nutrition and the exposure to sunshine of the cattle. Histological sections of some skin nodules showed the presence of mite colonies in the hair follicles. Only adults were seen in the sebaceous glands. Microscopical study of the morphology of the mites revealed the presence of two types of demodicids in the skin lesions and three types from epilated eyelashes. Morphological criteria are presented to aid in identification of species and of life stages.
Assuntos
Doenças dos Bovinos/patologia , Infestações por Ácaros/veterinária , Pele/patologia , Animais , Bovinos , Doenças dos Bovinos/parasitologia , Feminino , Interações Hospedeiro-Parasita , Masculino , Infestações por Ácaros/parasitologia , Infestações por Ácaros/patologia , Ácaros/fisiologia , Nigéria , Pele/parasitologia , TemperaturaRESUMO
Summary The study reported in the present paper discusses the clinical and histological picture of bovine demodecosis and the morphology of Demodex mites as seen in four cows suffering from generalized demodecosis. There were no clinical signs of other skin affections. Changes in both the number and the appearance of visible skin lesions were seen and related to the level of nutrition and the exposure to sunshine of the cattle. Histological sections of some skin nodules showed the presence of mite colonies in the hair follicles. Only adults were seen in the sebaceous glands. Microscopical study of the morphology of the mites revealed the presence of two types of demodicids in the skin lesions and three types from epilated eyelashes. Morphological criteria are presented to aid in identification of species and of life stages.
RESUMO
Under conditions simulating traditional husbandry, a single intramuscular dose (20 mg/kg) of long-acting oxytetracycline was efficacious in treating different grades of bovine dermatophilosis. There was complete healing in 26 out of 28 animals (93 per cent) within four weeks. By contrast, only four out of 11 animals treated with penicillin (70,000 iu/kg) plus streptomycin (70mg/kg) were apparently cured and three relapsed within one month. No spontaneous recoveries were observed among 18 untreated animals. In the group treated with oxytetracycline, two, in the penicillin plus streptomycin, seven, and in the untreated control group, 11 animals died of the disease.
Assuntos
Infecções por Actinomycetales/veterinária , Doenças dos Bovinos/tratamento farmacológico , Oxitetraciclina/uso terapêutico , Infecções por Actinomycetales/tratamento farmacológico , Animais , Bovinos , Feminino , Injeções Intramusculares , Masculino , Oxitetraciclina/administração & dosagem , RecidivaRESUMO
Nasal adenopapillomas were observed in 9 Y'anKasa and 1 Y'anKasa-Suffolk crossbred sheep (8 females and 2 males) over a 20-month period. The neoplasms originated from the epithelium of the lateral mass of the ethmoid bone. Gross and histologic features and clinical signs were similar in all cases. Influence of sex, age, or genetics was not established.
Assuntos
Adenoma/veterinária , Neoplasias Nasais/veterinária , Papiloma/veterinária , Doenças dos Ovinos/patologia , Adenoma/epidemiologia , Adenoma/patologia , Animais , Nigéria , Neoplasias Nasais/epidemiologia , Neoplasias Nasais/patologia , Papiloma/epidemiologia , Papiloma/patologia , Ovinos , Doenças dos Ovinos/epidemiologiaRESUMO
An outbreak of acute enteric paramphistomiasis was observed among Yankasa (indigenous) sheep that were herded with cattle on the University farm at Samaru in February 1973. Mortality was approximately thirty to forty per cent. The most important clinical signs were anorexia, unthriftiness and profuse foetid diarrhoea soiling the perianal region and hind legs. Diagnosis was based on the post-mortem findings, clinical signs and presence of conical flukes identified as Paramphistomum microbothrium.
Assuntos
Enteropatias Parasitárias/veterinária , Doenças dos Ovinos , Infecções por Trematódeos/veterinária , Animais , Enteropatias Parasitárias/patologia , Intestinos/patologia , Nigéria , Ovinos , Doenças dos Ovinos/patologia , Infecções por Trematódeos/patologiaRESUMO
Differences in histopathological changes between experimentally and naturally induced dermatophilosis were slight; natural infections persisted longer as they tended to be complicated by other concurrent dermatoses. Sequential pathological changes in bovine dermatophilosis included congestion, dermal oedema and neutrophilic infiltration of dermal papilae and epidermis by the third day; degenerative changes of cells in the upper portion of the stratum spinosum and invasion of the keratinised layer and hair follicles by the filamentous forms of Dermatophilus congolensis by the fourth day; regenerative processes involving the basal cells and selective cellular destruction in the spinous layer and further hair follicle invasion by D congolensis by the ninth day; and proliferative changes characterised by parakeratosis, hyperkeratosis, acanthosis and dermal sclerosis by the 15th day. It is postulated that cattle with hair follicles parasitised by D congolensis are carriers and are responsible for perpetuation of bovine dermatophilosis from one season to the next.
