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Hyena disease was first reported in France in 1975 and since then has been recognized in many countries. It is currently regarded as a disorder of skeletal development, mainly localised in the pelvic limbs of young cattle. Some investigators consider that it is a metabolic disease but the authors believe that it may be caused by a virus. Their hypothesis, according to which bovine virus diarrhoea-mucosal disease virus is involved, is based on epidemiological, histopathological and immunological evidence.
Vet Rec 1986 Mar 22
PMID:Hyena disease in cattle: a review. 351 8

Corynebacterium (Rhodococcus) equi is becoming increasingly significant as a cause of bronchopneumonia and lung abscessation in foals. The organism can survive within macrophages and may thus escape normal pulmonary defence mechanisms, particularly in immunocompromised animals. The disease has hitherto been associated with mortality rates as high as 80 per cent, partly as a result of inappropriate therapy. The selection of lipid-soluble antibiotics capable of intracellular penetration is critical for the successful treatment of C equi lung abscesses. A combination of two such antibiotics, erythromycin (25 mg/kg three times daily) and rifampicin (5 mg/kg twice daily) has been used on foals since 1981. Most of these animals had radiographic evidence of extensive lung abscessation, and in all cases the presence of C equi was confirmed on culture of tracheal aspirates. The duration of therapy ranged from four to nine weeks. Mild gastritis and diarrhoea were occasionally noted, but never such as to require termination of the therapy. No other adverse side effects were encountered. The success rate, as judged by a return to normal of chest radiographs and plasma fibrinogen concentrations, has exceeded 80 per cent.
Vet Rec 1986 Sep 13
PMID:Review of Corynebacterium (Rhodococcus) equi lung abscesses in foals: pathogenesis, diagnosis and treatment. 353 27

Endemic infection was a common sequel to primary outbreaks of transmissible gastroenteritis in large breeding herds of pigs in East Anglia. The main clinical features of the disease were diarrhoea affecting sucking piglets aged about six days or more, diarrhoea among recently weaned pigs and brief episodes of overt clinical recrudescence in part of the herd. Post mortem and bacteriological findings were often more suggestive of colibacillosis than transmissible gastroenteritis. In some herds, endemic infection remained clinically mild or inapparent for long periods. Evidence of endemic transmissible gastroenteritis infection was found in 43 (50.6 per cent) of 85 herds of pigs studied prospectively between 1981 and 1983. There was a significant correlation with herd size; the disease recurred during the 12 months after primary outbreaks in 36 (65.5 per cent) of 55 herds with over 100 sows compared with seven (23.3 per cent) of 30 herds with less than 100 sows (P less than 0.001). In the larger herds it occurred more commonly where finishers were kept (P less than 0.05). Sow morbidity and management factors during the primary outbreak had no statistically significant effect on the incidence of recrudescence. Epidemiological aspects of the findings are discussed with emphasis on the difficulties associated with the diagnosis and control of endemic transmissible gastroenteritis infection.
Vet Rec 1987 Mar 07
PMID:Transmissible gastroenteritis in endemically infected breeding herds of pigs in East Anglia, 1981-85. 357 22

Three types of raised perforated floor were compared with floor-level concrete which had perforated flooring at the rear. Piglets on raised perforated floors grew faster (P less than 0.05) to 21 days than pigs on mainly solid floors (205 g/day and 198 g/day, respectively). The mortality in the first 21 days of all pigs born did not differ between raised (18.4 per cent) and mainly solid floors (18.7 per cent) and there were no effects of individual floor types on overall survival or on deaths due to crushing. The incidence of diarrhoea was not significantly less on raised than on solid floors (27 per cent and 34 per cent of litters, respectively) but antibiotic treatment time was shortened (0.9 days and 1.2 days, P less than 0.05). The incidence of splayleg was highest on fibreglass slats. Concrete floors caused most knee abrasions but the incidence of arthritis was unaffected. Approximately twice as many sows on mainly solid floors went off their feed or had a high rectal temperature compared with sows on raised perforated floors. No differences were observed between narrow or A-frame farrowing crates.
Vet Rec 1987 Jul 11
PMID:Effects of farrowing crate floors on health and performance of piglets and sows. 362 85

Sulbactam-ampicillin is a combination of sulbactam, a beta-lactamase inhibitor, and ampicillin, a broad spectrum beta-lactam antibiotic. The efficacy of sulbactam-ampicillin was evaluated in the treatment of neonatal calf diarrhoea under conditions where a major proportion of the calves were excreting enterobacteria which were resistant to beta-lactam antibiotics. In a series of six studies with a common experimental design, three treatments (sulbactam-ampicillin, ampicillin alone and untreated control) were compared in over 300 Friesian and Ayrshire calves aged between three and 10 days and of known immunological status as determined by their zinc sulphate turbidity values. A mortality rate of 26.4 per cent in the negative control calves was reduced to 14.0 per cent with ampicillin alone and 9.5 per cent with sulbactam-ampicillin. The probability of diarrhoea subsequent to initiation of treatment was reduced from 0.50 in the negative control calves to 0.44 with ampicillin alone and 0.35 with sulbactam-ampicillin. The differences in mortality and diarrhoea observed between the calves treated with sulbactam-ampicillin and the calves in each of the other treatment groups were statistically significant. The superior efficacy of sulbactam-ampicillin is explained by the inhibitory effect of sulbactam on the beta-lactamases produced by resistant bacteria, thus rendering them susceptible to the ampicillin in the combination.
Vet Rec 1987 Aug 22
PMID:Efficacy of sulbactam-ampicillin in the treatment of neonatal calf diarrhoea. 366 May 56

Faeces samples were collected from 302 untreated calves on the day of onset of diarrhoea and from 49 healthy calves at 32 farms experiencing outbreaks of diarrhoea. At least four diarrhoeic calves were sampled on each farm, and samples were examined for rotavirus, coronavirus, cryptosporidium, enterotoxigenic Escherichia coli and Salmonella species. Although all these enteropathogens were excreted more frequently by the diarrhoeic than by the healthy calves, the difference was significant overall only for rotavirus. Rotavirus was excreted by 18 per cent of healthy calves, coronavirus by 4 per cent, cryptosporidium by 14 per cent, and no enterotoxigenic E coli or Salmonella species were detected. The most common enteropathogen in diarrhoeic calves was rotavirus, which was excreted by more than half the diarrhoeic calves on 18 farms. Coronavirus was excreted at a similar high prevalence on one farm, cryptosporidium on five farms and enterotoxigenic E coli on three farms. Concurrent infection with two or more microorganisms occurred in 15 per cent of diarrhoeic calves. There was no difference in the isolation rate of campylobacters between diarrhoeic and healthy calves.
Vet Rec 1986 Jul 12
PMID:Aetiology of diarrhoea in young calves. 375 Jul 66

Faeces samples from calves with diarrhoea in 45 outbreaks were examined for six enteropathogens. Rotavirus and coronavirus were detected by ELISA in 208 (42 per cent) and 69 (14 per cent) of 490 calves respectively; calici-like viruses were detected by electron microscopy in 14 of 132 calves (11 per cent). Cryptosporidium were detected in 106 of 465 (23 per cent), Salmonella species in 58 of 490 (12 per cent) and enterotoxigenic Escherichia coli bearing the K99 adhesin (K99+ E coli) in nine of 310 calves (3 per cent). In the faeces of 20 per cent of calves with diarrhoea more than one enteropathogen was detected; in 31 per cent no enteropathogen was found. Faces samples from 385 healthy calves in the same outbreaks were also examined. There was a significant statistical association of disease with the presence of rotavirus, coronavirus, Cryptosporidium and Salmonella species (P less than 0.001). Healthy calves were not examined for calici-like viruses and the association of K99+ E coli with disease was not analysed because there were too few positive samples. Rotavirus infections were more common in dairy herds and single suckler beef herds whereas Salmonella infections were more often found in calf rearing units. Cryptosporidium were more common in single and multiple suckler beef herds. K99+ E coli were found in one dairy herd and one multiple suckler beef herd both with unhygienic calving accommodation. Variations in coronavirus detection among different farm types were not statistically significant. In this survey rotavirus was the most commonly detected agent in calf diarrhoea and Cryptosporidium were found in approximately one quarter of affected calves. Infection with Salmonella species was widespread, but K99+ E coli infections were less common in the United Kingdom than in other countries.
Vet Rec 1986 Jul 12
PMID:Microbiology of calf diarrhoea in southern Britain. 375 Jul 67

The events which followed the introduction of a heifer into a dairy herd were consistent with the animal being persistently infected with bovine diarrhoea-mucosal disease virus. Obvious damage was limited to the progeny of cows which were in the first 168 days of gestation at that time. Only fetuses up to 81 days of gestation at the putative time of introduction of infection became persistently infected in calfhood and, although they exhibited body tremor, two such calves necropsied at three months of age lacked macroscopic or microscopic lesions in the central nervous system. In contrast calves which had been more advanced in gestation, at 146 and 153 days at the time of infection, had eliminated the infection and had lesions of cerebellar dysplasia and multifocal retinal atrophy.
Vet Rec 1986 Jan 11
PMID:Pestivirus fetopathogenicity in cattle: changing sequelae with fetal maturation. 375 9

The influence of some husbandry factors on morbidity and mortality was studied in 1996 artificially reared, dairy bred calves over the period from purchase until about six weeks of age. The effects of housing (indoors versus outdoors), penning (individual versus group), breed, time since purchase and season of purchase were examined. The overall mortality rate was approximately 4 per cent and calves were more likely to die if reared in groups outdoors than if reared either singly or in groups indoors. The mortality rate was significantly lower in calves purchased between April and June than at other times of year. Pneumonia was the most common disease symptom (48.3 per cent of calves) with diarrhoea the second most common (14.1 per cent). Neither the type of penning nor housing affected the incidence of pneumonia but diarrhoea was most common in individually penned calves. Case mortality rates for diarrhoeic calves in group pens were higher than for those in single pens and case mortality rates for pneumonia were highest for calves reared in groups outdoors. More than half the cases of pneumonia occurred between one and three weeks after purchase whereas two-thirds of the cases of diarrhoea occurred within the first week after purchase. However, case mortality rates for both conditions appeared to increase with time since purchase.
Vet Rec 1986 Oct 04
PMID:Some husbandry factors affecting mortality and morbidity on a calf-rearing unit. 378 94

An interactive computer-based guide (termed RESPITE) was developed to demonstrate to pig producers the expected level of pneumonia in pig herds which follow specified management practices known to influence the severity of pneumonia problems. A program was used to evaluate the combined effect of known risk factors present in the particular herd on the prevalence of lung lesions in slaughter pigs. The expected prevalence was estimated using formulae that were derived from observations and data in the published literature. Eleven risk factors considered are the number of pigs in the same room, all-in/all-out versus continuous flow of pigs, closed versus open herd, temperature fluctuation ratio, width of the buildings, space allotted per pig, the type of partitions separating adjacent pens, the presence or absence of diarrhoea as a clinical problem, liquid versus solid manure disposal, ascarid control efficiency, and the presence or absence of active Aujeszky's disease in the herd. Each of the factors can be assessed in the farrowing, nursery and grow-finish stages of production and the appropriate observations are entered. The computer uses the data to calculate the expected prevalence of pneumonia in animals leaving that stage of production. Of the pneumonia developing in the farrowing, nursery and grow-finish stages, 90 per cent, 75 per cent and 25 per cent respectively is considered to resolve before slaughter inspection at 100 kg. Adjusting for this degree of resolution, the program then estimates the expected final prevalence of pneumonic lesions in slaughter pigs. Comparison of predictions with slaughterhouse data from four herds indicated that the guide was realistic in its estimates.
Vet Rec 1985 Sep 14
PMID:RESPITE--a computer-aided guide to the prevalence of pneumonia in pig herds. 384 Jun 17


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