Veterinary education--a wider appreciation     

D G Howell 《The British veterinary journal》1972,128(3):114-120

  相似文献   

Observations on the mineral composition and staining properties of the inclusion bodies of infectious canine hepatitis     

J Kruszynski  J M Howell 《Research in veterinary science》1966,7(1):55-60

  相似文献   

Striped mice, Rhabdomys pumilio, and other murid rodents as hosts for immature ixodid ticks as in the Eastern Cape Province     

Petney TN  Horak IG  Howell DJ  Meyer S 《The Onderstepoort journal of veterinary research》2004,71(4):313-318

Striped mice, Rhabdomys pumilio, were trapped over a period of 17 months in the Thomas Baines Nature Reserve, and placed in cages, over water, until all the ticks they harboured had detached. The mice were then returned to the reserve. Four ixodid tick species were recovered from the mice of which the larvae and nymphs of Rhipicephalus follis and Rhipicephalus simus were the most numerous. Most larvae of R. follis detached from mice trapped from March to July, and most nymphs in March and from June to September. Most larvae of R. simus detached from mice trapped from December to March, and most nymphs from January to March and during May and June. Seven ixodid tick species were collected from striped mice, house rats, Rattus rattus, vlei rats, Otomys spp. and Praomys sp. captured in the vicinity of human dwellings or animal holding facilities in the Grahamstown district. The striped mice captured in the Thomas Baines Reserve harboured considerably larger numbers of ticks than any of the rodent species in the more urbanized localities.  相似文献   

Advanced Irrigation Engineering： Precision and Precise   总被引：1，自引：0，他引：1  

Terry  A.  Howell Steven  R.  EveR Susan  A.  O＇  Shaughnessy Paul  D.  Colaizzi Prasanna  H.  Gowda 《农业科学与技术》2012,(1):1-9

  相似文献   

Serum amyloid A concentration in mares with experimentally induced ascending placentitis     

M.A. Coutinho da Silva  I.F. Canisso  C.R.F. Pinto  M.L. Macpherson  B.S. Forshey  D.G. Howell 《Journal of Equine Veterinary Science》2012

  相似文献   

Involvement of ATP‐sensitive K+ channels in the peripheral antinociceptive effect induced by ketamine     

Thiago RL Romero  Igor DG Duarte 《Veterinary anaesthesia and analgesia》2013,40(4):419-424

ObjectiveTo investigate the contribution of K⁺ channels on peripheral antinociception induced by ketamine.Study designProspective experimental study.Animals110 male Wistar rats weighing 160–200 g.MethodsThe paw pressure required to elicit limb flexion was designated as the nociceptive threshold. Hyperalgesia was induced by intraplantar injection of prostaglandin E₂. All drugs were administered locally into the right hind paw of rats. Ketamine was administered into the right hind paw 2 hours and 55 minutes after local injection of PGE₂. Tetraethylammonium was administered 30 minutes prior to ketamine and the other K⁺ channel blockers, glibenclamide, dequalinium and paxilline, were administered 5 minutes prior to ketamine.ResultsProstaglandin E₂ (2 μg per paw) induced hyperalgesia. Ketamine (10, 20, 40 and 80 μg per paw) elicited a local peripheral antinociceptive effect that was antagonized by a specific blocker of ATP‐sensitive K⁺ channels, glibenclamide (20, 40 and 80 μg per paw). In another experiment, the non‐selective voltage‐dependent K⁺ channel blocker tetraethylammonium (30 μg per paw) and small and large conductance blockers of Ca²⁺‐activated K⁺ channels, dequalinium (50 μg per paw) and paxilline (20 μg per paw), were ineffective at blocking the effect of a local ketamine injection.Conclusions and clinical relevanceAnalysis of these results provides evidence that ketamine, may in part, induce peripheral antinociceptive effects by ATP‐sensitive K⁺ channel pathway activation.  相似文献   

Do dogs use a mirror to find hidden food?     

Tiffani J. Howell  Samia Toukhsati  Russell Conduit  Pauleen Bennett 《Journal of Veterinary Behavior: Clinical Applications and Research》2013,8(6):425-430

Dog (Canis familiaris) cognition research that examines whether dogs are able to use a mirror as a problem-solving tool is rare. The aim of this study was to explore whether dogs could find food that was visible only via a mirror at the beginning of the experiment. In a laboratory setting, we exposed 44 dogs to a large mirror, attached at a 90° angle to an opaque barrier for 10 minutes. Dogs were allowed complete freedom of movement. For the first minute of the exposure phase, the owner and experimenter stood against a wall, ignoring the dog; afterward, both walked around the room for 9 minutes. The dogs could observe their movements in the mirror. Then, dogs were taught to associate a bowl with food, after which the bowl was surreptitiously placed behind the barrier, and the dogs were positioned so that they could see the reflection of the food in the mirror. Dogs were pseudorandomly assigned to the experimental group (n = 22) as described or a control group (n = 22), which was identical except that the mirror was covered during the testing phase. In the testing phase, dogs that could see the mirror were more likely to find the treat than dogs that could not (P = 0.032). Although fewer dogs in the control condition found the food, those that did were just as likely as those in the mirror condition to locate it within 3 minutes. This suggests that, although dogs' food-searching behavior can be triggered by the mirror's visual cues to locate food, some dogs used other cues that we were unable to control.  相似文献   

Age effects on interspecific communicative abilities of domestic dogs     

Tiffani Howell  Samia Toukhsati  Russell Conduit  Pauleen Bennett 《Journal of Veterinary Behavior: Clinical Applications and Research》2013,8(4):e31

  相似文献   

Multiple-Paddock Grazing Distributes Utilization Across Heterogeneous Mountain Landscapes: A case study of strategic grazing management     

Matt Barnes  Jim Howell 《Herpetological Monographs》2013,35(5):52-61

  相似文献   

Experimental infections with fowl pox in chickens     

L.J. Howell  R. Hunter 《New Zealand veterinary journal》2013,61(11):270-272

Seven groups of chickens were challenged with a field isolate of fowl pox virus at 18 weeks old. The birds in the groups that had been vaccinated 3 weeks previously with fowl pox vaccinates showed no signs of disease. Birds which had not been vaccinated against fowl pox developed upper respiratory disease after challenge, and some birds had diphtheritic tracheitis and laryngitis which appeared identical to that commonly seen under field conditions. Seven days after challenge, fowl pox virus was recovered from the tracheas of unvaccinated birds, but not from the vaccinated ones.

Intercurrent Mycoplasma gallisepticum infection appeared to extend slightly the period of respiratory disease but was not essential for development of the diphtheritic lesion.  相似文献