Effects of tylosin feeding on the antibiotic resistance of selected gram-positive bacteria in pigs   总被引：2，自引：0，他引：2  

P J Christie  J N Davidson  R P Novick  G M Dunny 《American journal of veterinary research》1983,44(1):126-128

The effect of tylosin on macrolide resistance of gram-positive bacteria of pigs was determined. After an initial base-line period during which the pigs were given antibiotic-free feed, 1 group of 8 pigs was given tylosin feed (100 g/US ton of feed), and a 2nd group of 7 was given antibiotic-free feed. Samples were taken at 2- to 3-week intervals. For each pig, rectal, skin, and nasal swab samples were collected for enumeration of fecal streptococci and skin and nasal staphylococci. Percentages of macrolide resistant organisms of each group were tabulated on the basis of colony counts from antibiotic free and erythromycin-containing plates. After the introduction of tylosin into the feed of 1 group, a clear difference between the 2 groups with respect to the macrolide resistance of their gram-positive microflora was observed. The data indicate that tylosin feeding results in an increase in macrolide resistance of the bacterial flora of pigs.  相似文献   

Lens-induced uveitis in dogs: 151 cases (1985-1990).     

A van der Woerdt  M P Nasisse  M G Davidson 《Journal of the American Veterinary Medical Association》1992,201(6):921-926

During a 5-year period, phacolytic uveitis was diagnosed in 202 eyes of 151 dogs admitted to the veterinary teaching hospital. The diagnosis of phacolytic uveitis was based on the finding of a cataractous lens and anterior uveitis, unassociated with other identifiable causes of uveal inflammation. The most commonly affected breeds were the Toy and Miniature Poodle (35%) and the American Cocker Spaniel (19%). The mean age was 7.0 years for all breeds, 5.1 years for the Cocker Spaniel, and 9.0 years for the Poodle breeds. Evidence of cataract resorption was visible in 72% of the eyes. Fifty-one dogs were affected bilaterally and 100 dogs unilaterally. The mean interval between recognition of the cataract and the onset of lens-induced uveitis (LIU) was 17 months; mean times of 25 and 11 months were seen in the Poodle breeds and American Cocker Spaniel, respectively. The mean age of dogs requiring greater than 1 revisit before the inflammation had subsided was 5.5 years. Complications, referable to the uveitis, were seen in 14% of eyes, the most important of which were glaucoma (16 eyes) and phthisis bulbi (9 eyes). Lens extraction surgery was done on 50 LIU-affected eyes, and on 35 normal eyes in LIU-affected animals. The 2- and 6-month success rates for LIU-affected eyes were 78 and 39%, respectively, and for normal eyes in LIU-affected animals were 85 and 71%, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Assessment of the visually read N-acetylglucosaminidase test to detect mastitis in herd surveys     

H J Ball  B Davidson  D Greer 《The Veterinary record》1989,124(6):145-146

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Ovine Johne's disease in New Zealand     

R M Davidson 《New Zealand veterinary journal》1970,18(3):28-31

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Further observations on the effect of chloramphenicol on the haemopoietic system of the cat   总被引：1，自引：0，他引：1  

R H Penny  C H Carlisle  C W Prescott  H A Davidson 《The British veterinary journal》1970,126(9):453-458

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Dietary factors affecting the utilisation of protein by laying hens and their effects on the concentrations of certain nitrogenous constituents in the excreta     

O A Thomas  J Davidson  A W Boyne 《British poultry science》1969,10(1):67-82

New techniques involving extraction with organic solvents and lithium carbonate solution have been used to fractionate nitrogenous components of the excreta from laying hens fed diets in which the supplementary protein was groundnut meal, poor‐quality fish meal or good‐quality fish meal. The effect of adding methionine or lysine or both to the groundnut diet was also studied.

The proportion of ingested nitrogen excreted as uric acid or urate was significantly higher when the dietary protein supplement was groundnut meal than when it was good‐quality fish meal or groundnut meal supplemented with both lysine and methionine. Nitrogen retention, egg production and the apparent digestibility of nitrogen were higher on diets containing good‐quality fish meal than on diets containing groundnut meal alone. Intermediate effects were obtained when feeding diets supplemented with poor‐quality fish meal of groundnut meal containing either lysine or methionine. The implications of these findings are discussed. The main differences in protein utilisation associated with variations in dietary protein quality were reflected in the proportions of ingested nitrogen excreted as urates and as protein. Other nitrogenous components of excreta examined showed little variation with dietary protein quality. Benefits derived from the addition of methionine and lysine to the groundnut diet were obtained mainly by a more efficient use of absorbed amino acids.  相似文献   

Neodymium:yttrium, aluminum, and garnet laser energy delivered transsclerally to the ciliary body of dogs     

M P Nasisse  M G Davidson  N J MacLachlan  W Corbett  L P Tate  H C Newman  E M Hardie 《American journal of veterinary research》1988,49(11):1972-1978

Using a hand-held optical fiber, a surgical neodymium:yttrium, aluminum, and garnet laser was used transsclerally on the left ciliary body of 25 dogs. Dogs were assigned to groups and were given low (100 J) and high (238 J) energy levels. In 12 dogs given 100-J energy, the intraocular pressure decreased a mean value of 6 mm of Hg below that in the untreated right eye. However, intraocular pressure returned to the pretreatment value 1 week after treatment. Intraocular lesions were not found by histologic examination 28 days later. In the second group of 13 dogs treated with 238-J energy, 6 were euthanatized 7 days after treatment and 7 were euthanatized 28 days after treatment. A mean decrease in intraocular pressure of 10 mm of Hg in the treated left eye, relative to the untreated right eye, persisted throughout the evaluation period. In eyes examined histologically 7 days after treatment, ciliary hemorrhage and necrosis were prominent. Other histologic changes were minimal and consisted principally of iris stromal hemorrhage. Of 7 dogs examined for 28 days after treatment, 6 remained sighted; in 1 dog, extensive intraocular hemorrhage occurred, eventually resulting in phthisis bulbi. Ciliary atrophy and fibrosis were the important histologic lesions observed 28 days after treatment. Laser energy delivered transsclerally by this optical system effectively induced ciliary necrosis and may be an effective treatment for canine glaucoma.  相似文献   

Mechanisms of photo-oxidation reactions     

Robert S. Davidson 《Pest management science》1979,10(2):158-170

The factors affecting photochemical production of radicals, the reaction of these radicals with oxygen, the factors affecting the formation of singlet oxygen and superoxide anions and the reactivity of these species are discussed. The effect of the medium upon the course of photo-oxidation reactions and methods for investigating the mechanisms of these reactions are summarised.  相似文献   

Adenovirus isolation and serology from wild bobwhite quail (Colinus virginianus)     

D J King  S R Pursglove  W R Davidson 《Avian diseases》1981,25(3):678-682

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Book reviews     

J. Davidson  John T. Abrams 《British poultry science》1965,6(2):190-191

High Energy Diets for Poultry by W. O. Brown. U.S. Feed Grains Council: London, 1964. 48 pp.

The Nutrient Requirements of Farm Livestock. No. 1, Poultry: Summary of Recommendations. 50 pp. Agricultural Research Council, H.M.S.O., London, 1963. Price 2/6.  相似文献