Behavior and the Crustacean Molt Cycle: Changes in Aggression of Homarus americanus     

Tamm GR  Cobb JS 《Science (New York, N.Y.)》1978,200(4337):79-81

The phase of the molt cycle affects dominance status and the performance of agonistic acts in individual juvenile lobsters (Homarus americanus). Lobsters in the midphase of proecdysis are more aggressive than those in intermolt; the latter are more aggressive than lobsters in early or late proecdysis and those in postecdysis.  相似文献   

Isolation and molecular characterisation of Neospora caninum in cattle in New Zealand     

CM Okeoma  NB Williamson  WE Pomroy  KM Stowell  LM Gillespie 《New Zealand veterinary journal》2013,61(6):364-370

AIM: To isolate Neospora caninum from the brains of naturally infected cattle and use molecular techniques to characterise the isolates.

METHODS: Neospora caninum tachyzoites were isolated in Vero cell culture from the brains of a cow and two calves. The isolates were characterised using polymerase chain reaction (PCR) methods, DNA sequencing, an immunofluorescent anti-body test (IFAT), transmission electron microscopy (TEM), and immunohistochemistry (IHC). The brains of the three cattle were subjected to histopathological examination. A pathogenicity study was conducted in 120 BALB/c mice.

RESULTS: Neospora caninum tachyzoites were isolated from all three cases and first observed in vitro between 14 and 17 days post-inoculation. Parasites were sub-cultured and maintained in Vero cell culture for more than 6 months. PCR products were generated for all three isolates, using two different primers. Sequencing of the PCR products and a subsequent BLAST search identified the isolates as N. caninum. In addition, the isolates tested positive using IFAT and IHC, and ultrastructure revealed by TEM was characteristic of N. caninum. Histopathological examination revealed lesions characteristic of N. caninum in 1/3 brains. In the pathogenicity study using BALB/c mice, the mortality rate was 3–7%.

CONCLUSION: This was the first successful isolation of N. caninum in New Zealand confirmed using molecular characterisation tests.  相似文献   

Chronic pulmonary disease in West Highland white terriers.     

B M Corcoran  M Cobb  M W Martin  J Dukes-McEwan  A French  V L Fuentes  A Boswood  S Rhind 《The Veterinary record》1999,144(22):611-616

This paper describes the clinical features, and diagnostic findings of a chronic respiratory condition in 29 West Highland white terriers. Typically, the dogs were coughing chronically, had dyspnoea and tachypnoea of varying severity, and had deteriorated progressively over months to years. The mean (sem) survival time in months from the clinical signs being first noted by the owners was 17.9 (2.3). Most cases had a combination of respiratory signs, but coughing was the predominant sign in 18 cases. Inspiratory crackles were audible on chest auscultation in 28 cases, 10 of which were also wheezing. Rhonchi were the predominant sound in the remaining case. The main radiographic changes were mild to severe increased Interstitial markings in all cases, with additional bronchial markings in 14 of the dogs. Right-sided cardiomegaly (cor pulmonale) was recorded in 15. Bronchoscopic findings in 17 of the dogs were either normal or involved a mild airway mucoid reaction in eight. Chronic mucosal changes were observed in eight, but in two this finding was equivocal. Dynamic changes to the lumen of the airway were present in seven cases. No significant haematological or biochemical changes could be detected in 20 cases, but four cases were hypercholestrolaemic. A histopathological assessment of four cases revealed alveolar septal fibrosis to be the predominant change. Prednisolone, with or without bronchodilators, was the most commonly used therapy, and the response was variable. The condition appears to be associated with significant pulmonary interstitial fibrosis of unknown aetiology and has clinical similarities to idiopathic pulmonary fibrosis (cryptogenic fibrosing alveolitis) in human beings.  相似文献   

Parasites of sheep dogs in the Charleville district, Queensland     

KM CORNACK  PK O'ROURKE 《Australian veterinary journal》1991,68(4):149-149

  相似文献   

Herbicide classes in development. Mode of action,targets, genetic engineering,chemistry. P Böger,K Wakabayashi and K Hirai. Springer‐Verlag GmbH & Co KG,Berlin, 2002. pp 364 ISBN 0 540 43147 0.     

A Cobb 《Pest management science》2004,60(5):521-521

  相似文献   

Computer applications in veterinary medical education     

H Cobb 《Veterinary Clinics of North America: Small Animal Practice》1986,16(4):703-708

This is a review of the various computer applications used in veterinary medical education. The various applications include drill-and-practice, tutorial, problem-solving, testing, educational management programs, educational games, word processing, educational utilities, authoring programs, and simulations.  相似文献   

Characterization of thiamine in the raw peanut (Arachis hypogaea L.)     

R H Dougherty  W Y Cobb 《Journal of agricultural and food chemistry》1970,18(5):921-925

  相似文献   

Measurement of creatine kinase MB in canine cardiac patients     

KM WYATT  R. LABUC  GL WYATT 《Australian veterinary journal》1998,76(12):826-826

  相似文献   

The Ethics and Role of AI with Fresh and Frozen Semen in Dogs     

GCW England  KM Millar 《Reproduction in domestic animals》2008,43(S2):165-171

The use of artificial insemination (AI) with fresh semen has resulted in many benefits for the management of dog breeding, but there are disadvantages that can sometimes be overlooked. Furthermore, poorer quality semen arising as a result of cryopreservation necessitates uterine insemination, which raises the potential for surgical insemination. A number of significant ethical concerns have been raised by key stakeholders (such as The Kennel Club and the Royal College of Veterinary Surgeons) about AI per se , but particularly about the use of surgical insemination. This paper discusses the technological development of AI and explores a number of the ethical issues raised by its application to dog breeding. An Ethical Matrix method is used to map the potential ethical issues for key interest groups, namely dogs, breeders, owners, veterinarians and wider society. There are national variations in the way in which institutions have evaluated potential ethical impacts, and this is reflected in the different regulatory frameworks governing the use of AI in dogs. In order to facilitate decision-making and reduce some of the ethical risks associated with this technology, the veterinary research community could take several proactive steps including: (i) clarifying clinical decision-making processes, (ii) enhancing informed choice among clients and (iii) increasing the knowledge-base of potential impacts of AI.  相似文献   

Quantification of the DNA Difference,and Separation of X‐ and Y‐Bearing Sperm in Alpacas (Vicugna pacos)     

KM Morton  M Rückholdt  G Evans  WMC Maxwell 《Reproduction in domestic animals》2008,43(5):638-642

Sperm sexing is an emerging reproductive technology which has been successfully used to produce offspring of a pre‐determined sex in domestic and wildlife species but has yet to be applied to New World camelids. The aims of the present study were to (i) optimize the Hoescht 33342 (H33342) staining concentration for the flow cytometric separation of X and Y chromosome‐bearing alpaca (Vicugna pacos) sperm nuclei, (ii) separate alpaca sperm nuclei into high purity (>90%) populations bearing the X‐ and Y‐chromosome and (iii) determine the DNA difference between X‐ and Y‐bearing sperm in alpacas. Semen was collected from alpacas and sperm nuclei stained with H33342, incubated and analysed using a high‐speed cell sorter (SX‐MoFlo^®). H33342 staining concentrations of 36, 54, 72 or 90 μm did not affect the proportion of correctly oriented sperm nuclei (43.3 ± 3.9, 46.4 ± 3.7, 44.5 ± 4.0 and 51.1 ± 2.5% respectively) nor the speed of sorting (1381 ± 160, 1386 ± 123, 1371 ± 133 and 1379 ± 127 sperm nuclei/s). Sort reanalysis determined high levels of purity for X‐ and Y‐enriched populations (96.6 ± 0.7% and 96.1 ± 1.1% respectively). The DNA difference, based on fluorescence intensity (determined by the SX‐MoFlo^®), was 3.8 ± 0.06%. These data demonstrate for the first time that alpaca sperm nuclei can be separated into high purity populations and the potential for applying sperm sexing technology to New World camelids.  相似文献