Effect of storage of smears on the staining of ram spermatozoa by eosin or trypan blue     

P. SUTTIYOTIN  CJ THWAITES 《Australian veterinary journal》1994,71(3):87-87

  相似文献   

Bovine spongiform encephalopathy: epidemiological studies on the origin.   总被引：8，自引：0，他引：8  

J W Wilesmith  J B Ryan  M J Atkinson 《The Veterinary record》1991,128(9):199-203

The results of further epidemiological studies of bovine spongiform encephalopathy (BSE) support the previous findings that the onset of exposure of the cattle population to a scrapie-like agent, sufficient to result in clinical disease, occurred in 1981/82. The onset of this exposure was related to the cessation, in all but two rendering plants, of the hydrocarbon solvent extraction of fat from meat and bone meal. A further possible explanation, related to the geographical variation in the reprocessing of greaves to produce meat and bone meal, was identified for the geographical variation in the incidence of BSE.  相似文献   

Repeated chemical immobilization of a captive greater one-horned rhinoceros (Rhinoceros unicornis), using combinations of etorphine, detomidine, and ketamine.     

Mark W Atkinson  Bruce Hull  A Rae Gandolf  Evan S Blumer 《Journal of zoo and wildlife medicine》2002,33(2):157-162

An adult, 23 yr-old, male greater one-horned rhinoceros (Rhinoceros unicornis) was repeatedly immobilized with combinations of etorphine, detomidine, and ketamine to provide medical and surgical care to chronic, bilateral, soft tissue lesions on the hind feet and to collect semen by electroejaculation. The rhinoceros was successfully immobilized on 24 occasions over a 55 mo period at approximately 8-10 wk intervals, 17 times with a combination of etorphine and detomidine (M99-D, i.m.) by projectile dart and seven times with a combination of etorphine, ketamine, and detomidine (M99-K-D, i.m.) by pole syringe. The combination of etorphine, detomidine, and ketamine repeatedly and safely induced prolonged anesthesia, and a suitable drug combination includes 3.5-3.8 mg etorphine, 14 mg detomidine, and 400 mg ketamine (M99-K-D) administered i.m. into the neck.  相似文献   

Pectus excavatum and left to right intracardiac shunt in a kitten     

S. A. Johnston  M. L. Moon  R. N. Atkinson  G. E. Eyster† 《The Journal of small animal practice》1993,34(11):577-581

A six-week-old female kitten presented for severe pectus excavatum. Surgical correction was performed. One week later the kitten developed dyspnoea and a systolic murmur was detected on thoracic auscultation. Pulmonary oedema and cardiomegaly were identified radiographically, and a left to right intracardiac shunt was visualized using non-selective angiocardiography. Clinical signs resolved spontaneously one month later. The kitten has been asymptomatic for 24 months.  相似文献   

Effects of supplemental ruminally degradable protein versus increasing amounts of supplemental ruminally undegradable protein on site and extent of digestion and ruminal characteristics in lambs fed low-quality forage     

Atkinson RL  Toone CD  Ludden PA 《Journal of animal science》2007,85(12):3322-3330

Four ruminally and duodenally cannulated Suffolk wether lambs (34.5 +/- 2 kg initial BW) were used in a 4 x 4 Latin square designed experiment to compare effects of supplemental ruminally degradable protein (RDP) vs. increasing amounts of supplemental ruminally undegradable protein (RUP) on ruminal characteristics and site and extent of digestion in lambs. Lambs were fed a basal diet of crested wheatgrass hay (4.2% CP) for ad libitum consumption, plus 1 of 4 protein supplements: isolated soy protein (RDP source) fed to meet estimated RDP requirements assuming a microbial efficiency of 11% of TDN (CON) or corn gluten meal (RUP source) fed at 50, 100, or 150% of the supplemental N provided by CON (C50, C100, and C150, respectively). Neither NDF nor ADF intake was affected (P >/= 0.18) by protein degradability, but they increased or tended to increase (P /= 0.26) for CON and C100, but increased (P /= 0.33) by protein degradability. However, true ruminal N digestibility was greater (P = 0.03) for CON compared with C100. Ruminal ammonia concentrations were greater (P = 0.002) for CON compared with C100 lambs, and increased (P = 0.001) with increasing RUP. Microbial N flows were not affected (P >/= 0.12) by protein degradability or increasing RUP. Likewise, neither ruminal urease activity (P >/= 0.11) nor microbial efficiency (P >/= 0.50) were affected by protein degradability or level of RUP. Total tract OM, NDF, and ADF digestibility was greater (P 相似文献   

Adenosine 3',5'-monophosphate phosphodiesterase in the growth medium of Physarum polycephalum     

A W Murray  M Spiszman  D E Atkinson 《Science (New York, N.Y.)》1971,171(970):496-498

The acellular slime mold Physarum polycephalum releases a soluble adenosine 3', 5'-monophosphate phosphodiesterase into the growth medium. Although this enzyme resembles the particulate diesterase of the same organism in kinetic properties and in inhibition by methyl purines, its greater stability, its insensitivity to stimulation by imidazole and to inhibition by adenosine triphosphate,- and its selective release into the medium indicate a specific function, perhaps protection against exogenous cyclic nucleotide, for the soluble enzyme.  相似文献   

IS THE BIENNIAL HABIT OF OEligNOTHERA RACES CONSTANT IN THEIR NATIVE LOCALITIES?     

Atkinson GF 《Science (New York, N.Y.)》1913,37(958):716-717

  相似文献   

Identifying declines in waterbirds: The effects of missing data, population variability and count period on the interpretation of long-term survey data     

Philip W. Atkinson  Graham E. Austin  Mark M. Rehfisch  Helen Baker  Peter Cranswick  Mel Kershaw  James Robinson  Rowena H.W. Langston  David A. Stroud  Chris Van Turnhout  Ilya M.D. Maclean 《Biological conservation》2006,130(4):549-559

To manage and conserve wildlife populations effectively it is necessary to use methods that identify the often non-linear trends in populations, have an inbuilt assessment of trend quality and can analyse count data from a range of spatial scales. We present a method of trend analysis using generalised additive models. These produce smoothed indices of abundance that can be used to assess population change from one or more sites or time periods, with any number of estimates of abundance per index period. We apply this method to count data collected under the Wetland Bird Survey, a national scheme that monitors waterbirds in the United Kingdom. To highlight declining populations, ‘alerts’ were raised if the population decline was equal to or greater than 50%. Significance was determined using bootstrapped confidence intervals for analyses that included many sites, or a novel Monte-Carlo method for single site analyses. The impact of missing data, species count variability and the number of months used to calculate the population change was greater at individual sites than for national datasets, which were relatively insensitive to changes in the above parameters. For single sites it is essential that three or more counts be made per index period if reliable estimates of population change are required. We propose that the method presented could be applied to a wide range of national or other monitoring schemes for a variety of taxa.  相似文献   

An outbreak of avian malaria in captive yellowheads/mohua (Mohoua ochrocephala)     

MR Alley  RA Fairley  DG Martin  L Howe  T Atkinson 《New Zealand veterinary journal》2013,61(5):247-251

CASE HISTORY: Eight mohua, or yellowheads (Mohoua ochrocephala), were held in a large open aviary over the summer months of 2003–2004, following their capture for captivebreeding purposes. Two birds died of transportation trauma shortly after arrival, one became ill and died a month later, and another four died within a 2-week period in February 2004. The eighth bird also became ill at this time but survived for a year following treatment with chloroquine and doxycycline.

CLINICAL AND PATHOLOGICAL FINDINGS: The affected birds were depressed, lethargic and dyspnoeic. Necropsy of three birds showed a slightly pale and swollen liver and spleen. Impression smears of the liver of one bird revealed schizonts resembling Plasmodium spp. within the cytoplasm of many hepatocytes, which was confirmed histopathologically. Similar protozoal organisms were seen within splenic histiocytes and pulmonary endothelial cells of 5/6 birds. Electron microscopy identified these as protozoal schizonts containing merozoites of similar size and structure to those of Plasmodium spp.

DIAGNOSIS: The birds were infected with a protozoal haemoparasite resembling Plasmodium spp.; asexual stages within hepatocytes and endothelial cells of the lung and spleen were typical of this organism.

CONCLUSIONS AND CLINICAL RELEVANCE: The mohua captured from west Otago were highly susceptible to avian malaria as they came from an isolated population that was likely to be naïve and have had no previous contact with this organism. The birds were probably infected by bites from mosquitoes feeding off local populations of blackbirds subsequently found to be infected with Plasmodium spp.  相似文献   

Drenching adult ewes: Implications of anthelmintic treatments pre- and post-lambing on the development of anthelmintic resistance     

DM Leathwick  CM Miller  DS Atkinson  NA Haack  RA Alexander  A-M Oliver 《New Zealand veterinary journal》2013,61(6):297-304

  相似文献