Alterations in coagulation profiles and biochemical and haematological parameters in cattle with traumatic reticuloperitonitis.

This study was designed to investigate alterations in coagulation, and in biochemical and haematological parameters in cattle with traumatic reticuloperitonitis (TRP). In the study, 28 dairy cattle with TRP and 10 clinically healthy cattle (control) of different ages and breeds were used. Cattle with TRP had prolonged prothrombin time (PT), thrombin time (TT) and activated partial thromboplastin time (APTT). Erythrocytopenia, thrombocytopenia and hyperfibrinogenaemia were detected in animals with TRP. Furthermore, the serum concentrations of total protein, globulin and total bilirubin, and the activities of alkaline phosphatase (ALP) and aspartate aminotransferase (AST) were also high in cattle with TRP compared to those of the control group. The serum concentrations of calcium were significantly low in the TRP group. The results of this study, therefore, indicate that TRP causes significant coagulation abnormalities and biochemical and haematological alterations in dairy cattle.

Alterations in lipid profile in neonatal calves affected by diarrhea.

AIM: The aim of this study was to determine the alterations in the lipid profile, plasma alkaline phosphatase (ALP) activity, total and direct bilirubin levels of neonatal calves with diarrhea. MATERIALS AND METHODS: A total of 25 calves with diarrhea as experimental group and 10 healthy calves as control group, 1-30 days old, were enrolled in the study. Blood samples were collected from jugular vein in tubes with anticoagulant agent to evaluate the concentration of triglycerides, total cholesterol, high-density lipoprotein-cholesterol (HDL-C), ALP, total and direct bilirubin. Very low-density lipoprotein-cholesterol (VLDL-C) and low-density lipoprotein-cholesterol (LDL-C) levels were calculated according to the Friedewald formula. RESULTS: Significant increases in the plasma levels of ALP (p<0.05), total and direct bilirubin, triglycerides, and VLDL-C (p<0.01) were determined, whereas significant decreases in the levels of total cholesterol, HDL-C and LDL-C (p<0.01) were observed in neonatal calves with diarrhea. CONCLUSION: According to the findings of this study, liver functions impaired and, therefore, lipid profile is affected negatively in neonatal calves with diarrhea.

Prevalence of antibodies to Neospora caninum in local and imported cattle breeds in the Kars province of Turkey.

This study investigates the seroprevalence of Neospora caninum in cattle in the province of Kars in north-eastern Turkey. A total of 301 serum samples, 228 from local breeds of cows with a history of recent abortion and the remaining 73 collected at random from Simmental cows imported from Germany or their offspring, were tested for anti-Neospora antibodies by ELISA. All the serum samples from local breeds were negative for N. caninum antibodies, apart from one which tested inconclusive. In contrast six of the samples (8.2% with 95%CI: 2-14.5%) from Simmental cows tested positive. There was a significant difference (P<0.001) in the seroprevalence of N. caninum between local and Simmental breeds, even if the inconclusive test was considered positive, and the odds ratio of its occurrence in the Simmental breed was 20.3. In conclusion, it is unlikely that N. caninum contributes to abortion in local cattle breeds and our results also suggest that N. caninum was introduced to the region by the importation of Simmental cattle and that the vertical transmission of the parasite in cattle is important in the region.

Lymphocyte responses to mitogens and rickettsial antigens in sheep experimentally infected with Ehrlichia (Cytoecetes) phagocytophila.

Infection of sheep with Ehrlichia (Cytoecetes) phagocytophila, the causative agent of tick-borne fever (TBF), was characterised by a significant reduction in lymphocyte reactivity to the mitogens phytohaemagglutinin, concanavalin A, pokeweed mitogen and Escherichia coli lipopolysaccharide during the period of rickettsiaemia. The addition of the prostaglandin inhibitor, indomethacin, or the nitric oxide inhibitor, N(G)-monomethyl-L-arginine, had no significant effect on the suppressive effects of E. phagocytophila on lymphocyte reactivity to the mitogens. However, peripheral blood lymphocytes obtained from primed sheep proliferated in the presence of live or heat-inactivated E. phagocytophila. Antigen-specific proliferation was detected in lymphocytes samples obtained 11 to 21 days post-inoculation with E. phagocytophila.

Production of tumour necrosis factor-alpha (TNF-alpha) and reactive nitrogen intermediates by ovine peripheral blood leucocytes stimulated by Ehrlichia (Cytoecetes) phagocytophila.

Ehrlichia (Cytoecetes) phagocytophila, the causative agent of tick-borne fever in sheep and pasture fever in cattle, is an immunosuppressive, obligately intracellular rickettsia that invades granulocytes and monocytes of ruminants. Infected animals are known to suffer from a number of secondary infections. The mechanisms of immunosuppression are believed to be associated with physical or functional damage to leucocytes and the release of immunosuppressive substances. In the present study, the effects of E. phagocytophila on the production of tumour necrosis factor-alpha (TNF-alpha) and reactive nitrogen intermediates by ovine peripheral blood mononuclear cells (PBMCs) were investigated in vivo and in vitro. The concentration of TNF-alpha and nitrate in ovine sera were significantly increased during infection with E. phagocytophila, peak concentrations occurring at the peak period of rickettsiaemia. The addition of E. phagocytophila to cell cultures enhanced in-vitro production of TNF-alpha and nitric oxide by normal ovine PBMCs.

Ehrlichia (Cytoecetes) phagocytophila predisposes to severe contagious ecthyma (Orf ) in lambs.

Eight lambs experimentally infected with Ehrlichia (Cytoecetes) phagocytophila 7 days before exposure to orf virus were compared with control lambs infected with orf virus alone. The dually infected animals differed from the controls in showing skin lesions of greater severity, prolonged viral shedding, and lower antibody titres. Infection with E. phagocytophila had no significant effect on virus-specific lymphocyte proliferation. Such proliferation was detected in the peripheral blood of all lambs as early as 7 days after exposure to orf virus.

Inhibition of phagosome-lysosome fusion in ovine polymorphonuclear leucocytes by Ehrlichia (Cytoecetes) phagocytophila.

Ehrlichia (Cytoecetes) phagocytophila, the causative agent of tick-borne fever, is an intracellular bacterium that survives and multiplies within granulocytes and monocytes. In the present study, the possible fusion of lysosomes with phagosomes containing E. phagocytophila was investigated in poly-morphonuclear (PMN) cells of sheep infected with the agent, acid phosphatase cytochemistry and cationized ferritin being used as markers of primary and secondary lysosomal enzymes. Latex beads or Candida albicans were incubated with infected and uninfected PMN cells and labelled with the same lysosomal markers. Lysosomal enzymes labelled with the markers were commonly found in phagosomes containing latex beads or C. albicans, but there was no evidence of phagosome-lysosome (P-L) fusion in phagosomes containing E. phagocytophila. It was significant that in cells that contained E. phagocytophila, latex beads and C. albicans, P-L fusion occurred only in phagosomes containing latex beads or C. albicans. However, evidence of P-L fusion with phagosomes containing E. phagocytophila was obtained when PMN cells were incubated with oxytetracycline, which is known to inhibit synthesis of bacterial proteins. These findings indicate that E. phagocytophila is capable of inhibiting P-L fusion and that oxytetracycline depresses this capability.

The effects of levamisole poisoning on the haematological and biochemical parameters in dogs.

This study was designed to evaluate possible organ and system disorders associated with experimentally induced levamisole poisoning in dogs. For this purpose, twelve clinically healthy dogs of different ages, sexes and breeds were used. They were divided into two equal groups (Group A and Group B) and given levamisole orally at a dose of 25 mg/kg of body weight daily for three days. The dogs in Group B were also injected with atropin sulphate (0.04 mg/kg of body weight) subcutaneously (sc) 1 hour after each administration of levamisole. Routine clinical examinations were made and some haematological, biochemical and blood gas parameters were established at various times after administration of levamisole. The dogs in Group A developed severe neurological signs, gastric haemorrhage, bloody vomiting, colic, anaemia and four dogs died. In Group B these signs were mild and only one dog died. Levamisole poisoning was characterised by a significant reduction in the total number of red blood cells (RBCs), concentration of haemoglobin (Hb) and packed cell volume (PCV), and by anaemia. Peripheral blood pH, actual bicarbonate of plasma (HCO3), actual base excess (BE), partial pressure of oxygen (pO2) and saturated oxygen (O2SAT) increased in both groups of animals and these dogs developed metabolic alkalosis 48 hours after the first administration of levamisole. The results of the study also show that levamisole poisoning in dogs causes a significant increase in the activity of serum alanine aminotransferase (ALT) and of alkaline phosphatase (AP) and in the concentration of urea in both Group A and Group B. In the study, atropin sulphate reduced the severity of the clinical signs and the number of deaths, but it was not alone sufficient to remedy levamisole poisoning in dogs.

Clostridium perfringens and its toxins in minced meat from Kars, Turkey.

The aim of this study was to determine the prevalence of Clostridium perfringens and its toxins in minced meat. A total of 96 minced meat samples were collected from local markets (16) and small butcher's shops (80) in Kars (Turkey). Samples were analysed for the presence of C. perfringens and its toxins using a commercially available ELISA kit. A total of 31 (32%) Clostridium spp. strains were isolated and 17 (55%) of these isolates were identified as C. perfringens. Four (25%) of the samples from local markets and 27 (34%) from small butcher's shops were contaminated with Clostridium spp. Furthermore, C. perfringens was isolated from two (12%) and 15 (19%) samples from local markets and small butcher's shops, respectively. Mean counts of Clostridium spp. were 2.2 +/- 0.83 x 10(2) CFU g(-1) for local markets and 4.35 +/- 8.53 x 10(2) CFU g(-1) for small butcher's shops; mean counts for C. porringers were 2.75 +/- 0.21 x 10(2) and 6.82 +/- 10.96 x 10(2) CFU g(-1) from markets and butcher's shops, respectively. The number of samples contaminated with both Clostridium spp. and C. perfringens was higher in small butcher's shops than in local markets. Moreover, higher numbers of Clostridium spp. and C. perfringens were isolated in samples from small butcher's shops than from local markets. A total of 13 (13%) samples were also positive for toxins produced by the organism, as detected by ELISA. Eleven samples from small butcher's shops and two samples from local markets were positive for the C. perfringens toxins tested. Moreover, two (12%), one (1%), four (4%) and two (2%) samples were contaminated with C. perfringens types A, B, C and D, respectively. In conclusion, some meat samples collected from local markets and small butcher's shops contained C. perfringens and its toxins and, therefore, present a potential risk of food poisoning.

The effects of Ehrlichia (Cytoecetes) phagocytophila on the clinical chemistry of sheep and goats.

Tick-borne fever (TBF) is a rickettsial disease of domestic and wild ruminants in temperate climates where the hard tick Ixodes ricinus is present. The disease is characterized by a high temperature and severe leukopenia. In the present study, the effects of TBF on the activity of serum alkaline phosphatase (ALP), and on the concentrations of plasma zinc, iron, total bilirubin, urea, creatinine and albumin were investigated by inoculating one group of eight sheep and one group of eight goats with the Old Sourhope (OS) strain of Ehrlichia (Cytoecetes) phagocytophila. All goats and sheep experimentally infected with E. phagocytophila reacted with fever, rickettsiaemia and leukopenia. The leukopenia was due to an acute lymphocytopenia and prolonged neutropenia. In both groups of animals. TBF was characterized by significant reductions in the activities of serum ALP and concentrations of plasma zinc, iron and albumin. However, there were significant increases in the concentrations of plasma total bilirubin, urea and creatinine in both species of animals. The reductions in ALP and iron were significantly more pronounced in sheep than in goats.

Differential haematological effects of tick-borne fever in sheep and goats.

Tick-borne fever (TBF) is a rickettsial disease of domestic and wild ruminants in temperate climates. It is characterized by high fever and severe leukopenia. In the present study, the possible difference in the severity of disease in sheep and goats was investigated by inoculating one group of eight goats and one group of eight sheep with the Old Sourhope (OS) strain of Ehrlichia (Cytoecetes) phagocytophila. All sheep and goats experimentally infected with E. phagocytophila reacted with fever and rickettsiaemia, but there were significant differences between goats and sheep in the severity of clinical disease, the duration and magnitude of fever, the magnitude of rickettsiaemia and the patterns of reduction in the number of total leucocytes. Sheep reacted with fever significantly earlier than goats and the febrile period lasted for a significantly longer period. In contrast, the magnitude of rickettsiaemia was significantly higher in goats than in sheep. Infection with TBF was characterized by a transient increase in the number of neutrophils, which was quickly followed by an acute reduction in the number of lymphocytes and a prolonged reduction in the number of neutrophils in both sheep and goats. In both groups of animals, infection with TBF was also characterized by significant reductions in the total number of red blood cells (RBCs), thrombocytes and packed cell volume (PCV) and the concentration of haemoglobin (Hb). However, the mean corpuscular volume (MCV) and mean corpuscular Hb (MCH) were significantly increased in sheep only.