Diagnostic Features of Acute Chagas Myocarditis with Sudden Death in a Family of Boxer Dogs          下载免费PDF全文

J.P. Vitt  A.B. Saunders  M.T. O'Brien  J. Mansell  D.K. Ajithdoss  S.A. Hamer 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2016,30(4):1210-1215

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Ochronosis‐like condition in a cat          下载免费PDF全文

Laura K. Bryan  Brad R. Weeks  Harold Ross Payne  Lori A. Thompson  Joanne L. Mansell 《Veterinary dermatology》2016,27(4):311-e77

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Postpartum anoestrus in five seasonally‐calving dairy farms in Victoria,Australia          下载免费PDF全文

KL Plozza  DS Beggs  PD Mansell  MA Stevenson  CB Blackwood  MF Pyman 《Australian veterinary journal》2016,94(8):293-298

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Calcinosis circumscripta associated with osseous cranial thoracic stenotic myelopathy in a dog          下载免费PDF全文

W. Hinson  C. E. Boudreau  J. F. Griffin IV  J. Mansell  R. R. Pool 《The Journal of small animal practice》2016,57(9):495-495

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Seroconversion to avian influenza virus in free-range chickens in the Riverland region of Victoria     

IJ East  C Ainsworth  S Warner  M Dunowska  JK Azuolas 《Australian veterinary journal》2010,88(8):290-293

Background Since 2005, H5N1 avian influenza (AI) has spread from South-East Asia to over 60 different countries, resulting in the direct death or slaughter of over 250,000,000 poultry. Migratory waterfowl have been implicated in this spread and in Australia there have been numerous isolations of low-pathogenicity AI virus from wild waterfowl and shorebirds. The Department of Human Services, Victoria maintains 10 sentinel free-range chicken flocks in the Riverland at locations that are populated by large numbers of waterfowl known to carry a range of strains of AI. Objective This study analysed historical samples collected in 1991–94 and 2003–06 from the library of serum samples for antibodies against AI to assess the potential for transfer of AI virus from wild waterfowl to free-range poultry. Results Of the 2000 serum samples analysed, 17 were positive for antibodies against AI and 87 were suspect, with a clustering of positive and suspect results in the years 1994, 2003 and 2004. There was also a clustering of positive samples at the site of the Barmah flock. Nine sequential sets of sera from individual chickens with at least one positive result were identified. Analysis of these sequential sets showed that infection was acquired on site but that the antibody response to AI infection was short-lived and was no longer detectable at 8 weeks after the positive finding. Conclusion The surveillance of sentinel chickens is a potential avenue for monitoring the circulation of AI viruses and could provide an early warning system for the commercial poultry industries.  相似文献   

Natural Heterobilharzia americana infection in horses in Texas     

Corapi WV  Snowden KF  Rodrigues A  Porter BF  Buote MA  Birch SM  Jackson ND  Eden KB  Whitley DB  Mansell J  Edwards JF  Hardy J  Chaffin MK 《Veterinary pathology》2012,49(3):552-556

The schistosome Heterobilharzia americana infects dogs, raccoons, and other mammals in the southeastern United States. Migration of eggs into the liver results in parasitic granulomas with varying degrees of fibrosis and inflammation. Recently, hepatic parasitic granulomas in horses were shown to be caused by H. americana infection. In the present study, samples of liver from 11 of 12 horses with hepatic granulomas identified at necropsy (n = 11) or surgical biopsy (n = 1) were used for DNA extraction, polymerase chain reaction amplification and sequencing using primers specific for a portion of the H. americana small subunit ribosomal RNA gene. A polymerase chain reaction amplicon of the correct size was produced from the extracted DNA in 8 of the 11 horses. Amplicons from 5 of the 8 positive horses were sequenced and had 100% identity with H. americana. In all but 2 of the 12 horses, Heterobilharzia was not responsible for the primary clinical disease, and the hepatic granulomas were considered an incidental finding.  相似文献   

The effect of GnRH or oestradiol injected at pro-oestrus on luteal function and follicular dynamics of the subsequent oestrous cycle in non-lactating cycling Holstein cows     

Segwagwe BV  Macmillan KL  Mansell PD 《The Onderstepoort journal of veterinary research》2006,73(1):61-70

Oestrous synchronization involves synchronization of ovarian follicular turnover, new wave emergence, and finally induction of ovulation. The final step can be synchronized by the parenteral administration of either GnRH or oestradiol benzoate. This study investigated corpus luteum and follicular emergence after ovulation had been induced by the administration of either GnRH or oestradiol benzoate. The injection of oestradiol benzoate may have delayed the emergence of the first follicular wave subsequent to the induced ovulation; administration of oestradiol benzoate or GnRH lowered the progesterone rise so that the maximum dioestrous concentration of progesterone on Day 9 was lower when cows were treated during pro-oestrus compared to the spontaneously ovulating controls. One implication of findings from the present study is that induction of ovulation with either oestradiol benzoate or GnRH, administered 24 or 36 h after withdrawal of the CIDR device, respectively, may lower fertility. Future studies must identify the timing of administration relative to the time of CIDR device withdrawal and the optimum concentration of oestradiol benzoate or GnRH that would not have untoward effects on the development of the corpus lutea, particularly within the first week of dioestrus.  相似文献   

A comparative study of the effect of 2 hormonal treatment protocols on the reproductive performance of previously anoestrous dairy cows     

Segwagwe BV  Malmo J  Macmillan KL  Mansell PD 《Journal of the South African Veterinary Association》2006,77(1):33-39

The objective of this study was to compare the reproductive performance of anoestrous dairy cows treated just prior to the mating start date (MSD) with a Controlled Internal Drug Releasing Device (CIDR) which was placed intravaginaly for either 6 or 8 days, and a combination of oestradiol benzoate. Lactating dairy cows (n = 926) that had been diagnosed with anovulatory anoestrus were divided into two sub-groups. A hormonal treatment protocol that involved the use of a CIDR device containing 1.9 g of progesterone was inserted into the vagina of each cow and left intravaginally for either 6 (6-day group, n = 441) or 8 days (8-day group, n = 485). Every cow in the trial was inseminated after being detected in oestrus from Day -2 onwards (where Day 0, was a herd's MSD), using an appropriate detection aid according to the herds' preference. Cows that had been seen in oestrus and were inseminated by Day 2 were selected for re-synchrony. The standardised re-synchrony involved the re-insertion of a previously used CIDR device into the vagina of each cow on Day 14, together with an injection of 1.0 mg oestradiolbenzoate i.m. This CIDR device was removed on Day 22 and each of these cows injected with 1.0 mg oestradiol benzoate i.m. on Day 23. Each re-synchronised cow that was detected in oestrus was re-inseminated. Treatment with an 8-day CIDR increased the proportion of cows submitted for insemination within the first 3 days of the MSD, compared with the 6-day group (83.7 % vs 71.2%, respectively, P < 0.001), as well as the proportion of cows conceiving within the first 3 days of MSD (36.2% vs 27.7%, P = 0.02), but reduced both the interval from MSD to the first service (4.5 +/- 0.5 vs 6.8 +/- 0.7, P = 0.01), and the interval from MSD to conception (28.1 +/- 1.5 vs 34.0 +/- 1.8, P = 0.009). A greater percentage of the cows in the 6-day group that were not pregnant to the first insemination were submitted for a second insemination by Day 28 compared with the 8-day group (81.1% vs 68.3%, P < 0.001). Conception rates for cows submitted for this second insemination by Day 28 of the MSD were also higher in the 6-day than in the 8-day group (48.4% vs 33.9%, P = 0.009). The percentage of cows pregnant at the end of a herd's AI period of 6 weeks did not differ (57.1% vs 54.8% for 8-day and 6-day groups, respectively, P = 0.42); neither did the proportion of cows pregnant at the end of the a herd's combined AI and natural mating period of 21 weeks (81.4% vs 79.2%, for 8-day and 6-day groups respectively P = 0.36). Treatment of anovulatory anoestrous dairy cows with a combination of an 8-day CIDR and oestradiol benzoate before the MSD improved their reproductive performance by increasing the portion of cows submitted for insemination within the first 3-days of the MSD by reducing the interval from MSD to first service and by increasing the conception rate to the first insemination to collectively reduce the average interval from MSD to conception.  相似文献   

Dominance aggression of a dog towards one member of a family     

JK BLACKSHAW 《Australian veterinary journal》1996,74(5):349-350

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Bovine platelets retain functional activity in the presence of penicillin G.          下载免费PDF全文

P A Gentry  P D Mansell  D J Mason    P D Conlon 《Canadian journal of veterinary research》1992,56(4):365-369

It has been reported that antibiotics of the penicillin family impair the functional response of human, canine and lapine platelets to a broad range of agonists. In contrast, we have shown that the bovine platelet retained full functional responses to stimulation by adenosine diphosphate (ADP) or platelet activating factor (PAF) following administration of penicillin G to clinically normal cattle at 20,000 IU/kg for three days. The aggregation response to collagen was transiently reduced to approximately 50% of pretreatment values, but only while the drug was detectable in the circulation. When penicillin was added to platelet rich plasma suspensions, ADP-induced aggregation was similar to that of the control untreated platelets, while the PAF-induced aggregation response was reduced by not more than 25%. Only collagen-induced aggregation exhibited a modest dose-dependent inhibitory response in the presence of penicillin. It is postulated that the relative insensitivity of the bovine platelet to penicillin may be related to differences in postreceptor biochemical events compared to the human platelet.  相似文献