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An outbreak of ataxia, blindness, respiratory disease and kerato-conjunctivitis occurred in October 1972 in a beef feedlot in Cyprus. Fifteen animals died and 10 that were severely ataxic were slaughtered; many animals became blind. There was no opportunity to isolate virus when the disease was active but in March and October 1973 infectious bovine rhinotracheitis (IBR) virus was isolated from cattle after they had been treated corticosteroids to stimulate virus excretion. It is probable that IBR virus caused the disease. This is the first report of the isolation of IBR virus from cattle in Cyprus.
Vet Rec 1975 May 24
PMID:Use of corticosteroids to isolate IBR virus from cattle in Cyprus after respiratory disease and ataxia. 4 19

In September 1991 cataracts occurred in two year-classes of triploid Atlantic salmon. The fish showed varying degrees of blindness, were lethargic and became emaciated owing to their inability to feed. The lesions in the lens were mainly in the anterior and posterior cortex and perinuclear areas, the capsule and embryonic nucleus remaining unaffected. Diploid fish of the same year-class did not have cataracts. The origin of the triploid fish, the method of triploidisation, their diet and disease status were investigated, but no predisposing factors could be found to account for the high incidence of cataracts.
Vet Rec 1992 Dec 12
PMID:Occurrence of cataracts in triploid Atlantic salmon (Salmo salar) on four farms in Scotland. 148 45

The ductuli efferentes of Sprague-Dawley rats were studied by microdissection and microscopic evaluation to document the presence of blind-ending tubules (ductuli aberrantes) and to describe morphological and ultrastructural differences between normally open ductules and blind-ending tubules. The branching patterns of the ductuli efferentes varied considerably between animals. A majority of the animals studied had either six or seven ductuli connected to the rete testis, with some animals having as few as four or as many as eight. Pairs of ductules began merging in the conus vasculosa, ultimately forming a single terminal duct within the capsule of the initial segment epididymidis. In a majority of animals, the junctions were unequally matched and located at various positions within the conus. Blind-ending tubules, found in 60% of the animals, were surrounded by thick connective tissue, and had a smaller diameter (78.7 +/- 1.4 microns) than normal ductules in the conus vasculosa (119.5 +/- 2.1 microns) or the terminus (102.2 +/- 1.5 microns). The lumina of blind-ending tubules were contracted and did not contain sperm. Nonciliated cells in the epithelium of blind-ending tubules contained fewer PAS-positive granules and electron-dense bodies (lysosomes) than nonciliated cells in normal ductules. Consideration of these characteristics will prevent blind-ending tubules from being mistaken for pathological changes in efferent ductules.
Anat Rec 1992 Mar
PMID:Blind-ending tubules and branching patterns of the rat ductuli efferentes. 154 66

Two unrelated adult dogs developed idiopathic, acute-onset, bilateral total blindness. The ophthalmoscopic changes were minimal and no electroretinographic response could be detected in either dog. The retinas were examined ultrastructurally 10 days (dog 1) and two-and-a-half months (dog 2) after they became blind. There was widespread loss of the outer segments of rod and cone photoreceptors. Where the outer segments persisted, there was marked tubulovesicular change with loss of normal orientation in their lamellae. Second order neurons (bipolar cells) and ganglion cells were unaffected. The cause of this selective and massive disruption of rod and cone endings was not established, but acute toxicity is proposed as a possible mechanism.
Vet Rec 1992 Feb 22
PMID:Sudden acquired retinal degeneration ('silent retina syndrome') in two dogs. 156 41

The bovine cervical mucosa was investigated with respect to structure, mucus secretory pattern, and sperm transport. Structural investigation included stereomicroscopic examination of surface-stained tissue blocks and graphic reconstruction of serial sections by using both computer-generated and Plexiglas models. Histochemistry of the mucosa was evaluated in follicular- and luteal-phase animals. Alcian blue, periodic acid Schiff, and high-iron diamine were utilized to distinguish sialomucins, sulfomucins, and neutral mucins. Location and orientation of cervical sperm in follicular phase animals were evaluated 12 h postmating by using light and electron microscopy. Cervical mucosa was characterized by longitudinal primary folds, most of which maintained continuity throughout the cervix. Superimposed on these were secondary folds which varied in length and depth. Abundant, shallow, uniformly spaced, and parallel longitudinal "grooves" covered all surfaces. Grooves had greater continuity in regions distal, as opposed to proximal, to the cervical canal. Blind-ending glands or crypts were not apparent. Follicular-stage cervices exhibited a pronounced sialomucin production in basal areas within grooves while neutral and sulfomucins were predominant in apical areas. In luteal-phase animals, basal sialomucin production was markedly decreased while sulfated and neutral mucins remained abundant. Numerous cranially oriented spermatozoa were observed within the shallow grooves of cervical folds (sialomucin-rich areas) in mated animals and were unidirectionally opposed to ciliary beat. It appeared that privileged paths for transport of viable spermatozoa may originate in the fornix vagina, extend through longitudinal primary folds at the external os, and progress to the uterus within continuous sialomucin-rich channels which are associated with basal areas of the shallow grooves, distal to the cervical canal.
Anat Rec 1989 Oct
PMID:Study of the functional anatomy of bovine cervical mucosa with special reference to mucus secretion and sperm transport. 281 24

A telephone survey of 50 owners of blind dogs was made in order to assess how well visually deprived dogs can cope within their environment. Ten of the 50 dogs surveyed died or were euthanased as a direct result of their blindness or ocular disease. Three owners were unable to come to terms with their pet's visual loss. Two dogs died as a result of accidents directly associated with blindness and five dogs were euthanased due to pain caused by glaucoma. Twenty-seven owners reported permanent behaviour or temperament changes in their pets. Behavioural changes included a more cautious approach to the environment and closer contact with the owner. Owners were aware of an obvious compensatory reliance on the senses of hearing and smell. Permanent temperament changes were reported in only two dogs both of whom became more aggressive. Only six of the surveyed dogs were unable or unwilling to find their way around in familiar surroundings. The most consistent measures undertaken by owners to ensure the dogs' safety was to prevent access to roads and to ensure that there was minimal movement of furniture within the home. Six dogs lost interest in exercise after the onset of blindness but a further six were still allowed to roam at large. Of the 32 owners who accompanied their dogs eight reported that restraint on a lead was unnecessary. Twenty-eight owners had encountered people who had suggested it was unkind to keep a blind dog.
Vet Rec
PMID:Coping with blindness: a survey of 50 blind dogs. 322 13

Keratoconjunctivitis affected many ewes on a large, experimental husbandry, hill farm in early and midwinter in two consecutive years. Small sporadic outbreaks occurred among ewes during the following winters and among ewes and lambs in the summer and autumn. Mycoplasma conjunctivae was isolated from conjunctival swabs taken from affected sheep. Keratoconjunctivitis had not been recognised on the farm before and the infection was probably introduced with purchased rams. Prompt treatment prevented blindness; a single application of aureomycin topical powder with an intramuscular injection of a long acting oxytetracycline was an effective clinical treatment. Prophylactic treatments with aureomycin powder did not prevent the spread of the disease. The outbreak appeared to have no effect on the weaning percentage and blackface and Cheviot ewes were equally susceptible.
Vet Rec 1988 Jan 09
PMID:Keratoconjunctivitis in a hill sheep flock. 336 25

The diagnosis and treatment of a case of lead poisoning in a cynomolgus monkey (Macaca fascicularis) are described. The clinical signs were jaundice and amaurosis. Clinicopathological findings suggested cholestasis. A tentative diagnosis of lead poisoning was made when basophilic stippling of erythrocytes was observed in a peripheral blood smear. The diagnosis was confirmed by finding a lead concentration of 2280 micrograms/litre in a venous blood sample. Cage bars painted with red lead appeared to be the source of the poison. The lead was chelated by the intramuscular administration of 2,3 dimercapto-1-propanol (BAL) and calcium disodium edetate for seven days, followed by oral D-penicillamine for five weeks. The encephalopathy was treated with dexamethasone sodium phosphate. Recovery from the blindness was noted after 10 days and marked improvement of the general well being of the animal was observed after one month.
Vet Rec 1986 Jan 18
PMID:Icterus and amaurosis caused by lead poisoning in a cynomolgus monkey (Macaca fascicularis). 395 44

An outbreak of polioencephalomalacia affected 16 of 46 Swaledale lambs and five of 25 Scottish blackface lambs 15 to 32 days after they were introduced to an ad libitum concentrate ration containing 0.43 per cent sulphur. The clinical signs were acute and included depression central blindness and head-pressing, but no hyperaesthesia, nystagmus, dorsiflexion of the neck or opisthotonos were observed. Treatment of the affected lambs with vitamin B1, dexamethasone and antibiotics was associated with a prolonged recovery period, though no further cases were identified after vitamin B1 had been given parenterally to all the lambs at risk.
Vet Rec 1996 Apr 06
PMID:Sulphur-induced polioencephalomalacia in lambs. 873 Jun 74

After being anaesthetised for between one hour 40 minutes and seven hours, five adult horses developed acute neurological signs and extensive cerebrocortical necrosis. Four of them had had abdominal surgery for colic and one had had repeated orthopaedic interventions. Between five hours and seven days after the surgery, all five horses suddenly developed severe signs of a predominantly prosencephalic disturbance: bilateral blindness with normal pupillary light responses, abnormal behaviour varying from propulsive pacing to head pressing profound lethargy and generalised seizures. They were euthanased between 24 hours and three weeks after the onset of these signs. In three of the cases a gross examination of the brain revealed patchy malacia of the cerebral grey matter and some discolouration of the adjacent white matter. Microscopical examination revealed lesions that varied from laminar neuronal necrosis in the grey matter of the cerebral cortex to more diffuse necrosis of the cortex and underlying white matter. Four of the five cases had had a period of hypercapnea while anaesthetised, and two of them (and possibly a third) had also had hypoxaemia.
Vet Rec 2002 Jan 19
PMID:Postanaesthetic cerebral necrosis in five horses. 1193 18


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