Gene/Protein Disease Symptom Drug Enzyme Compound
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A syndrome on four dairy farms in which calves up to two months of age died suddenly during a period of excitement usually precipitated by feeding was investigated. The description given by owners was that during, or shortly after milk feeding, the calves grunted, fell and died within one minute. Post mortem examinations revealed patchy myocardial pallor but no other lesions or evidence of infectious disease. Histopathological studies revealed peracute myocardial degeneration. Biochemical examinations have shown a selenium deficiency in in-contact calves and since this was corrected, no further cases have occurred. It is suggested that this is an additional manifestation of the selenium deficiency syndrome and that in certain circumstances, a deficiency of available selenium renders cardiac muscle vulnerable to stresses which induce severe peracute damage and leads to cardiac failure and sudden death.
Vet Rec 1978 Sep 09
PMID:Sudden death in calves associated with acute myocardial degeneration and selenium deficiency. 71 69

An outbreak of a haemorrhagic diathesis in cattle fed home produced hay is described. A similar syndrome was reproduced experimentally in calves by feeding them the hay. The experimental disease was characterised by increased prothrombin and partial thromboplastin times while the leucocyte and erythrocyte counts remained normal until the terminal haemorrhage. The calves ate well and grew well until the rapid onset of progressive weakness, stiff gait, mucosal pallor, tachycardia, tachypnoea and haematomata ending in sudden death. The absence of blood coagulation was seen at necropsy while petechial, ecchymotic and free haemorrhages were found in most organs. Particularly striking were massive ecchymotic haemorrhages on the peritoneal surface of the rumen, a bloody, gelatinous mass enveloping each kidney and extensive bruising, haemorrhage and haematomata in the subcutis of the limbs. In a second feeding trial the effects of various preparations of vitamin K1 and vitamin K3 were investigated. Oral administration of large quantities of vitamin K1 reduced the elevated prothrombin time; vitamin K3 acted less consistently. Analysis of the hay for trichothecene mycotoxins was negative but floral analysis revealed that sweet vernal grass (Anthoxanthum odoratum) comprised about 80 per cent of the hay. Dicoumarol was detected in the hay and in the serum and ruminal contents of the experimental calves. The diagnosis, treatment, control and importance of this syndrome in the United Kingdom are discussed.
Vet Rec 1983 Jul 23
PMID:Haemorrhagic syndrome of cattle associated with the feeding of sweet vernal (Anthoxanthum odoratum) hay containing dicoumarol. 619 8

Paratuberculosis was diagnosed in one 18-month-old and two 30-month-old hinds in a herd of 70 red deer (Cervus elaphus) in Ireland. Loss of condition and intermittent diarrhoea were the main clinical findings. Clumps of acid-fast organisms were found in the faeces of the three deer. Post mortem examination of one deer showed a slight swelling and pallor of the intestinal tract and associated lymph nodes. Histopathology showed a severe, granulomatous enteritis and lymphadenitis, with extensive cellular infiltration, notably with epithelioid macrophages containing numerous acid-fast organisms. Mycobacterium paratuberculosis was isolated from intestinal and lymph node samples. Paratuberculosis was also confirmed in one of nine clinically normal, yearling stags, sampled at slaughter. Complement fixation tests and enzyme-linked immunosorbent assays gave higher readings for clinically affected deer than healthy ones. Acid soil on the farm was believed to be a contributory cause.
Vet Rec 1993 Feb 27
PMID:Paratuberculosis in farmed red deer (Cervus elaphus) in Ireland. 845 13

Mercury poisoning was diagnosed in four dairy heifers, three of which died. The clinical signs were variable and included salivation, excessive thirst, extreme depression and severe diarrhoea. Postmortem examinations revealed inflammation and ulceration of the alimentary tract, pulmonary and cardiac haemorrhages, pallor of the kidney cortices and perirenal oedema. The kidney mercury concentrations were in the range 58 to 91 micrograms/g wet tissue. It is believed that the animals were poisoned by the ingestion of soil contaminated with mercurous chloride.
Vet Rec 1997 May 24
PMID:Poisoning of dairy heifers by mercurous chloride. 918 11

Two types of sinus nodal cells were responsible for the main differences in the literature concerning the ultrastructure of the sinuatrial node: the intercalated clear cells and pale cells. Canine hearts were arrested by (1) aortic cross clamping, (2) coronary perfusion with the cardioplegic solution St. Thomas, and (3) coronary perfusion with the cardioplegic solution HTK (Custodiol(R)). After fixation by immersion or perfusion the sinus node tissue was prepared for electron microscopy. Following cardioplegic arrest and perfusion fixation, three nodal cell types in the non-ischemic sinuatrial node were observed: typical nodal cells, transitional cells, and intercalated clear cells. Less than 1% of the non-ischemic sinuatrial cells were intercalated clear cells, surrounded by typical nodal cells or transitional cells. The contractile apparatus of the intercalated clear cells was extremely poorly developed. Great structural variations in the mitochondria were observed in intercalated clear cells, variations that would not appear under conditions of ischemia. In contrast, after 15-25 min of ischemia at 25 degrees C the appearance of the sinus nodal cells was strikingly different from that of the non-ischemic sinuatrial cells. More than 10% of the nodal cells showed typical ischemic alterations, e.g., mitochondrial swelling, clumping of nuclear chromatin, loss of glycogen particles, and cell swelling in varying degrees. Because they look very pale, these nodal cells have been described as pale cells in the literature. Intercalated clear cells appear mainly in non-ischemic nodal tissue. Pale cells are ischemically damaged sinus nodal cells.
Anat Rec 2000 09 01
PMID:Intercalated clear cells or pale cells in the sinus node of canine hearts? An ultrastructural study. 1096 34

Young calves which died on three dairy farms in England and Wales had generalised pallor and heavy infestations of the long-nosed sucking louse, Linognothus vituli. Surviving calves had packed-cell volumes, haemoglobin concentrations and red blood cell counts below the reference ranges, consistent with anaemia, and they were also heavily infested with lice. No other causes of anaemia were identified. It is proposed that heavy infestations with L. vituli should be considered when investigating the cause of anaemia in calves.
Vet Rec 2003 Aug 09
PMID:Anaemia and mortality in calves infested with the long-nosed sucking louse (Linognathus vituli). 1450 82

The pal-rec gene of Antirrhinum majus suppresses anthocyanin except in those cell lines where pal-rec has mutated to Pal, so that anthocyanin-coloured flecks appear on whitish petals. Antirrhinum majus families of very high and very low anthocyanin content (Dark and Pale) were obtained and crossed with two pal-rec pal-rec lines, one with consistently high and the other consistently low mutability. Mutable offspring from Dark parents tended to show higher mutability than those from Pale parents in crosses with either mutable line, providing evidence for an association between intense pigmentation and high mutability. Such an association is discussed in the context of relationship between precursor availability for conversion by a gene product and initiation of activity of that gene.
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PMID:Evidence for correlation between mutability of an unstable anthocyanin-governing locus and abundance of anthocyanin. 2427 Jul 5