ABSTRACT
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.
Subject(s)
Cattle Diseases/pathology , Mite Infestations/veterinary , Skin/pathology , Animals , Cattle , Cattle Diseases/parasitology , Female , Host-Parasite Interactions , Male , Mite Infestations/parasitology , Mite Infestations/pathology , Mites/physiology , Nigeria , Skin/parasitology , TemperatureABSTRACT
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.
ABSTRACT
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.
Subject(s)
Actinomycetales Infections/veterinary , Cattle Diseases/drug therapy , Oxytetracycline/therapeutic use , Actinomycetales Infections/drug therapy , Animals , Cattle , Female , Injections, Intramuscular , Male , Oxytetracycline/administration & dosage , RecurrenceABSTRACT
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.
Subject(s)
Adenoma/veterinary , Nose Neoplasms/veterinary , Papilloma/veterinary , Sheep Diseases/pathology , Adenoma/epidemiology , Adenoma/pathology , Animals , Nigeria , Nose Neoplasms/epidemiology , Nose Neoplasms/pathology , Papilloma/epidemiology , Papilloma/pathology , Sheep , Sheep Diseases/epidemiologySubject(s)
Dog Diseases/congenital , Orbit/abnormalities , Animals , Dog Diseases/genetics , Dogs , Eye Abnormalities , Male , Nose/abnormalitiesABSTRACT
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.
Subject(s)
Intestinal Diseases, Parasitic/veterinary , Sheep Diseases , Trematode Infections/veterinary , Animals , Intestinal Diseases, Parasitic/pathology , Intestines/pathology , Nigeria , Sheep , Sheep Diseases/pathology , Trematode Infections/pathologyABSTRACT
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.
