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Biomedical subjects

W J Hartley

Publications and source records attributed to W J Hartley.

At least 73 records · Page 4Linked to original sources
PubMed1981

Laryngeal paralysis in Arabian foals associated with oral haloxon administration.

Bilateral laryngeal paralysis is described in 5 Arabian and part-Arabian foals aged between 23 and 35 days. Tracheotomies resulted in complete relief of dyspnoea. Two cases showed recovery of abductor function of the right arytenoid cartilage after 3 weeks and one of these cases later recovered left abductor function. Four of the foals were autopsied at various times from one week to 6 months after the onset of respiratory obstruction. Histology of the recurrent laryngeal nerves showed active Wallerian degeneration and loss of nerve fibres in many fascicles in cases affected for one to 2 weeks. In the longer standing cases there was a severe deficiency of myelinated fibres. Histology of the dorsal and lateral cricoarytenoid muscles showed no abnormalities in the cases affected from one to 5 weeks. However, in the foal affected for 6 months there was variation in fibre diameter in the left dorsal cricoarytenoid muscle; in sections stained for myosin ATPase there was evidence of muscle fibre type grouping in both left and right dorsal cricoarytenoid muscles. It is postulated that the most likely cause of the condition was oral haloxon administration which was given to the foals at a dose rate of 1 to 2 g at fortnightly intervals, beginning at 2 days of age.

Animals↗
PubMed1980

Field and experimental studies in cattle and sheep poisoned by nitro-bearing Astragalus or their toxins.

Various species of nitro-containing Astragalus, and the toxic principle of these plants, 3-nitropropionic acid or 3-nitro-1-propanol, were fed to sheep and cattle at doses which produced chronic or acute intoxication. The signs of intoxication produced were similar to those observed in poisoning that occurs under field conditions. The signs of intoxication were emphysema and difficulty in locomotion. Primary microscopic lesions were observed in the lungs and CNS. The lungs had varying degrees of alveolar emphysema and there were varying degrees of wallerian degeneration of the spinal cord.

1-Propanol↗
PubMed1979

An outbreak of foal perinatal mortality due to equid herpesvirus type 1: pathological observations.

Twenty-nine cases of EHV1 infection occurred on a property, mainly in full term foals. Some foals were stillborn, some were born alive but weak and soon died and others were healthy at birth, became ill and died within 3 days of birth. Apart from voluminous, oedematous and atelectic lungs there were no gross lesions. Microscopically the lungs showed oedema, pneumonitis and bronchiolitis with intranuclear inclusions and, in many of the foals that survived over 6 hours, there was also hyaline membrane formation. Microscopic lesions were also seen in the liver, adrenal, thymus and spleen of some of these foals.

Animals↗
PubMed1978

Perinatal foal mortality associated with a herpesvirus.

An outbreak of perinatal foal mortality associated with a herpesvirus is described. Twenty two foals either were still-born, or died soon after birth, or were weak and soon developed severe respiratory signs, or were normal at birth and developed respiratory symptoms 18 to 24 hours later. Elevated temperatures, heart and respiratory rates were constant features. The animals were severely leucopaenic, and showed an absolute neutropaenia. At autopsy the lungs were enlarged, and showed varying degrees of aeration and moderate to severe oedema and congestion. Histopathology showed an acute focal necrotising bronchiolitis with the presence of intranuclear eosinophilic inclusion bodies. Herpesvirus was recovered from 9 foals in cell culture and identified by electron microscopy.

Animals↗
PubMed1978

Effects of feeding Oxytropis and Astragalus pollen to mice and Astragalus seeds to rats.

Pollens collected from Astragalus lentiginosus and Oxytropis sericea were fed to mice. At the end of the feeding period, uterine weights were taken to determine estrogenic activity, and tissue was collected for microscopic examination. The pollen from A lentiginosus, but not from O sericea, induced lesions similar to those of locoweed poisoning. The pollen from neither plant was estrogenic. Seeds from A lentiginosus produced toxicosis when fed to rats.

Animals↗
PubMed1977

Neurologic lesions in young captive lions associated with vitamin A deficiency.

Ataxia and incoordination occurred in 7 lion cubs in a lion park. Postmortem examination of 3 cubs revealed thickened skull bones which compressed the brain and lead to prolapse of the posterior vermis of the cerebellum through the foramen magnum. In 2 of the lions compression of the anterior cervical spinal cord caused marked damage particularly in the dorsal funiculi. In both cubs the central canal of the spinal cord was abnormal being extended laterally. The pathological changes in the bones and the brain together with low liver vitamin A levels lead to a diagnosis of hypovitaminosis A.

Animals↗