Urethral tumours in dogs   总被引：1，自引：0，他引：1  

J. V. Davies  H. M. Read 《The Journal of small animal practice》1990,31(3):131-136

Urethral tumours in 21 dogs are reported. Transitional cell carcinoma was the most frequent presentation. A more deliberate radiographic protocol has enhanced diagnostic ability and has improved presurgical evaluation. The use of a transpubic surgical approach has allowed the direct examination of the affected urethra and excision or resection of focal and diffuse lesions in 10 dogs with periods of remission varying from eight to 22 months. The apparent success of the surgical technique underlines the necessity for early and careful investigation of the dysuric, haematuric case.  相似文献   

Postnatal Development of the Lower Canine and Cheek Teeth of the Pig     

A. S. Davies 《Anatomia, histologia, embryologia》1990,19(3):269-275

Postnatal development of the teeth of German Landrace and Göttingen Miniature pigs was studied by measuring the areas of each tooth visible on lateral radiographs of the mandibles. It was concluded that the appearance of the teeth at each stage, and the relation of their growth to that of the rest of the masticatory apparatus, relates mainly to postnatal changes in the relative location of the jaw pivot.  相似文献   

Production and related variables in bovine leukaemia virus-infected cows     

R. M. Jacobs  J. L. Heeney  M. A. Godkin  K. E. Leslie  J. A. Taylor  C. Davies  V. E. O. Valli 《Veterinary research communications》1991,15(6):463-474

A newly developed milk dot blot test was used to detect anti-bovine leukaemia virus (BLV) antibody in milk samples from 2079 lactating adult cows from among 61 herds. The milk dot blot test was highly repeatable; the concordance rate, compared with the agar gel immunodiffusion test performed on serum, was 83.5%. All herds contained BLV-positive cows; the prevalence rate was 36%. BLV-positive cows tended to come from larger herds and were older and more often later in lactation. Fourteen production and related variables (herd size, age, days open, days in milk, milk somatic cell count, milk, fat, and protein produced in the current lactation, projected production of milk, fat, and protein, and breed class average deviations for milk, fat, and protein) were compared between BLV-positive and BLV-negative cows. Although somatic cell count, milk produced, and projected production of milk and protein were related significantly to BLV status using simple tests of association, once the variables herd size, age and days in milk were controlled, these differences were removed. Further analyses using logistic (outcome: individual cow BLV status) and least-squares regression (outcome:herd proportion of BLV-positive cows) failed to show an association between any of the measured production or related variables and BLV-positivity. We concluded that the effect of BLV on production and related variables in dairy cows was below the sensitivity of our analytical techniques or was non-existent.Abbreviations ABCA herd average breed class average for milk, fat, and protein production - AVGAGE average age of the herd - ADIM herd average for days in milk - AGID agar gel immunodiffusion - AVGSCC herd average milk somatic cell count - BCA breed class average, a milk, fat and protein production index calculated by comparing a cow's actual 305-day lactation production to the corresponding BCA standard for the same breed, age, and month of calving - BLV bovine leukaemia virus - CALVINT calving interval - COWAGE cow age - DBCA breed class average deviation for milk, fat, and protein production, the difference between an individual cow's BCA and the herd average - DIM days in milk - HS herd size corresponding to the number of lactating cows in a herd - LACT actual amount of milk, fat, and protein produced in a cow's lactation - ODHIC Ontario Dairy Herd Improvement Corporation - PCTPOS percentage of herd that is BLV-positive - PROJ projected 305-day production for milk, fat, and protein by fitting to a standard lactation curve adjusted for days in milk and age at calving - RHBCA rolling herd average for breed class average for milk, fat, and protein production, the average for all cows that completed a lactation (cows must have completed a 305-day lactation) during the previous 12 months - SCC milk somatic cell count  相似文献   

疾病的演化     

钟伟  R.S.Morris  R.R.Davies  D.E.Lawton 《国外畜牧学(猪与禽)》2002,(5):32-33

许多因素造成了疾病的演化 ,我们会面临什么样的未来呢 ?  相似文献   

Genetic control of immunity to gastrointestinal nematodes of cattle     

L C Gasbarre  E A Leighton  C J Davies 《Veterinary parasitology》1990,37(3-4):257-272

Previous studies have indicated that host genetics significantly affects the number of gastrointestinal nematode eggs per gram (epg) in the feces of calves during their first grazing season. An entire calf crop of approximately 190 animals was monitored monthly until weaning to verify these earlier results, and to begin to discern the basis for this phenomenon. A significant genetic effect on fecal epg values was not observed until calves had been on pasture for 2-3 months, and was demonstrable until late in the grazing season when the effect was lost. The loss of a genetic effect coincided with the appearance of significant numbers of the more highly fecund nematode species Haemonchus placei and Oesophagostomum radiatum, and with an apparent increase in Ostertagia ostertagi transmission, indicating that the observed genetic control of epg values may be species specific, dose dependent or both. Calves were selected from the population, and grouped according to their epg phenotype over the grazing season as either high or low epg calves. Postmortem examination of some of these calves indicated that worm burdens in the low epg calves were 60% of those of the high epg calves. Experimental challenge inoculation of the remaining calves indicated that: (1) challenge with Cooperia oncophora resulted in low epg calves harboring worm numbers that were 65% of those of high epg calves; (2) challenge with O. ostertagi resulted in similar numbers of worms in both groups, but the fecundity of worms in the low epg groups was significantly lower (P less than 0.05) than in the high epg group. Analysis of serum anti-Ostertagia antibody levels in the grazing calf population showed rises in serum IgG1, IgG2, IgM and IgA antibody levels during the grazing season. Peak serum IgG2 and IgG1 anti-Ostertagia antibody levels were found to be significantly affected by host genetic factors while IgA and IgM levels were not under such control.  相似文献   

Contrast radiography of the equine oesophagus: effect of spasmolytic agents and passage of a nasogastric tube     

J N King  J V Davies  E L Gerring 《Equine veterinary journal》1990,22(2):133-135

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世界猪病的发展与演变     

冯汉利  吴斌 《养殖与饲料．饲料世界》2003,(1):44-46

1 疾病是生态的和进化的动态过程 任何疾病都是某些相互作用持续进行的结果,这种相互作用在传统上一直被称为“病原-宿主-环境”三者之间的相互作用,这种概念已经相当过时。甚至较新的病因网络观点仍然有其局限性,因为它仅仅考虑到危害因素,而疾病的发展还包括时间和空间上的因素。我们只注意捕捉疾病的个别图像,这种思维方式往往左右了我们对疾病的考虑。动物死亡之后,病理学家看到的只是疾病的“静态照片”;临床专家看到的只是主要时期的  相似文献   

Pancreatitis, gastrointestinal ulceration and haemorrhage and necrotising cystitis following the surgical treatment of degenerative disc disease in a dachshund     

M Davies 《The Veterinary record》1985,116(15):398-399

A case of pancreatitis with gastrointestinal ulceration and haemorrhage and necrotising cystitis in a five-and-a-half-year-old dachshund bitch which unexpectedly died six days after dorsolateral fenestration was performed for thoracolumbar degenerative disc disease is described.  相似文献   

Sheep ectoparasites in Wales     

Armstrong D  Davies L 《The Veterinary record》2007,160(22):775-776

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Factors affecting oat haploid production following oat × maize hybridization     

P. K. Sidhu    N. K. Howes    T. Aung    P. K. Zwer    P. A. Davies 《Plant Breeding》2006,125(3):243-247

Doubled haploids (DHs) are becoming increasingly important in crop breeding programmes but methods for producing oat DHs remain inefficient. In this study haploid and DH oat plants were produced using the oat × maize hybridization method. Factors influencing the rate of caryopsis and haploid embryo production including genotype, post‐pollination plant growth regulator application and temperature were investigated. The four growth regulators tested showed significant differences in their capacity to induce caryopsis formation with dicamba producing the highest numbers of caryopses, followed by picloram, 2,4‐dichlorophenoxyacetic acid (2,4‐D) and gibberellic acid (GA₃). No significant differences were observed between these growth regulators for their effect on embryo production. The concentration of dicamba was also important and was found to influence caryopsis but not embryo production, with 50 and 100 mg/l dicamba producing significantly more caryopses than 25 or 5 mg/l. Temperature had a significant impact on both caryopsis and embryo production with the magnitude and direction of response depending on genotype. Rates of haploid embryo production observed were between 0.8% and 6.7% of the pollinated florets. The proportion of haploids, which survived and were successfully doubled with colchicine following transfer to soil was between 72% and 81%.  相似文献