Verenigingsnieuws     

J. A. J. Veenenbos Jr. 《European journal of plant pathology / European Foundation for Plant Pathology》1958,64(2):163-164

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Management of persons exposed to rabies     

E. A. Beckcom Jr. 《Tropical animal health and production》1969,1(1):69-74

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Visualizing certainty of extrapolations from models of land change   总被引：2，自引：0，他引：2  

Robert Gilmore Pontius Jr.  Anna J. Versluis  Nicholas R. Malizia 《Landscape Ecology》2006,21(7):1151-1166

This article presents a method to estimate and to visualize the certainty of land change models as they extrapolate beyond the time interval for which empirical data exist. The method to project the certainty relies on measurements of model performance during a validation run with historic data and on the assumption that the model’s accuracy approaches randomness as it predicts farther into the future. A land change model typically predicts each pixel as exactly one category for each year. This article presents a technique to convert those predictions into conditional probabilities. As an example, we use the model Geomod to extrapolate forest change over a century for the Plum Island Ecosystems, which is a Long Term Ecological Research site of the United States’ National Science Foundation. Geomod uses calibration information between 1971 and 1985 in order to predict the changes from 1985 to 1999, at which point the validation procedure measures the model’s predictive accuracy. Then the model is re-calibrated with information from 1985 to 1999 in order to extrapolate into the future, assuming a business as usual scenario. As time progresses, the expected accuracy approaches 0.5, which is the probability at which the model’s prediction is as accurate as a random prediction, since the application involves two categories. The extrapolated accuracy of the prediction for the entire study area in the year 2097 is 68%. The method is designed to work with any number of categories so it can be used with a variety of land change models.  相似文献   

Influence of Semen Storage and Cryoprotectant on Post-thaw Viability and Fertility of Stallion Spermatozoa   总被引：1，自引：0，他引：1  

C.M. Melo MS  F.S. Zahn PhD  I. Martin MS  C. Orlandi MS  J.A. Dell'Aqua  Jr. PhD  M.A. Alvarenga PhD  F.O. Papa PhD   《Journal of Equine Veterinary Science》2007,27(4):171-175

The aim of the current study was to verify that stallion spermatozoa could be cooled for 24 hours and then frozen. In experiment I, one ejaculate from each of 13 stallions was used. Semen was collected and split into two parts; one part immediately frozen using standard cryopreservation techniques and the other diluted, stored in an Equitainer for 24 hours, and then frozen. In experiment II, one ejaculate from each of 12 stallions was collected, diluted with Botu-Semen, and split into two parts: one cooled in an Equitainer and the other in Max-Semen Express without prior centrifugation. After 24 hours of cooling, the samples were centrifuged to remove seminal plasma and concentrate the sperm, and resuspended in Botu-Crio^® extender containing one of three cryoprotectant treatments (1% glycerol + 4% dimethylformamide, 1% glycerol + 4% dimethylacetamide and 1% glycerol + 4% methylformamide), maintained at 5°C for 20 minutes, then frozen in nitrogen vapor. No difference was observed between the two cooling systems. The association of 1% glycerol and 4% methylformamide provided the best post-thaw progressive motility. For experiment III, two stallions were used for a fertility trial. Forty-three inseminations were performed using 22 mares. No differences were seen in semen parameters and pregnancy rates when comparing the two freezing protocols (conventional and cooled/frozen). Pregnancy rates for conventional and cooled/frozen semen were, respectively, 72.7% and 82.3% (stallion A), and 40.0% and 50.0% (stallion B). We concluded that cooling equine semen for 24 hours before freezing, while maintaining sperm viability and fertility, is possible.  相似文献   

51-Chromium Labeled Erythrocyte Half-time Disappearance from Miniature Swine          下载免费PDF全文

J. B. Mulder  R. V. Brown    L. A. Corwin  Jr. 《Canadian journal of veterinary research》1972,36(2):103-107

Half-time disappearance of ⁵¹Cr-laeled erythrocytes was studied in 39 Sinclair miniature swine at 20 to 46 days of age and again at 79 to 109 days of age. Mean erythrocyte half-time disappearance, disregarding age, was 21.29 (±0.77) days for males and 22.04 (±0.81) days for females. The half-time difference between males and females was not statistically significant (P<0.05). At 20 to 46 days of age the mean erythrocyte half-time disappearance was 19.56 (±1.41) days. The same pigs, tested at 79 to 109 days of age, had a mean erythrocyte half-time disappearance of 23.95 (±1.94) days. There was a significant difference (P<0.01) in erythrocyte half-time disappearance from miniature swine as the result of age and also for age within sex. The grand mean erythrocyte half-time disappearance, for all the miniature swine tested, was 21.67 (±0.54) days. The estimate of heritability was 0.61 for dam effect at 20 to 46 days of age and 0.06 at 79 to 109 days of age. Sire estimate of heritability was 0 at both age groups. It was concluded that the large heritability coefficient found only for dam component in young nursing pigs was the result of maternal environment rather than additive genetic variance.  相似文献   

Clinical and clinico-pathological effects of Escherichia coli endotoxin in mature cattle.   总被引：3，自引：3，他引：0       下载免费PDF全文

L C Griel  Jr  A Zarkower    R J Eberhart 《Canadian journal of veterinary research》1975,39(1):1-6

The effects of intravenous administration of Escherichia coli endotoxin were studied in eight mature lactating cows. Three cows were studied following intrammary infection with E. coli. Significant clinical findings are presented. Significant clinico-pathological findings include leukopenia, decreased blood serum calcium concentrations and increased levels of serum glutamic-oxaloacetic transaminase and serum ornithine-carbamyl transferase. Significant elevations of plasma corticosteroids were also noted.  相似文献   

Prolactin and Gonadotropin Responses in Geldings to Injections of Estradiol Benzoate in Oil, Estradiol Benzoate in Biodegradable Microspheres, and Estradiol Cypionate     

D.L. Thompson Jr. PhD  P.B. Mitcham MS  M.L. Runles BS  P.J. Burns PhD  R.M. Gilley MS 《Journal of Equine Veterinary Science》2008,28(4):232-237

We previously reported success in inducing early ovulation in seasonally anovulatory mares with a combination of estradiol pretreatment followed by daily administration of a dopamine antagonist (sulpiride). Although every-other-day injections of estradiol benzoate (EB) were effective in that experiment, practical application of this technology would require simplification of the treatment regimen. The current experiment was designed to compare, in a gelding model, the biologic responses of two alternative, one-injection regimens for estradiol delivery to the established EB treatment used previously. Fifteen long-term geldings were sampled via jugular venipuncture from November 5 to 7, 2006, and were then administered intramuscular injections of vegetable oil (n = 4); EB, 11 mg in oil (n = 4; controls); EB in biodegradable microspheres (300 mg; n = 3); or estradiol cypionate, 100 mg in oil (n = 4). Injections of EB in oil were repeated every other day for a total of 10 injections, as was done in our previous experiment. Jugular blood samples were drawn from all geldings at 3, 6, 12, 24, 36, and 48 hours relative to injections, and then on the mornings of days 3, 4, 6, 8, 10 to 18, 22, 26, and 30. On days 10 through 13, all geldings received subcutaneous injections of 125 mg sulpiride, a dopamine receptor antagonist, to stimulate prolactin secretion. On day 12, each gelding received an intravenous injection of 30 μg gonadotropin-releasing hormone (GnRH) analog and 3 mg thyrotropin-releasing hormone (TRH); frequent blood samples were drawn to characterize the luteinizing hormone (LH), follicle-stimulating hormone (FSH), and prolactin responses. Relative to geldings receiving oil, all geldings receiving estradiol injections had a rise (P < .05) in estradiol concentrations lasting at least 12 days. Daily LH concentrations increased (P < 0.01) in all treated groups, but the response was delayed approximately 14 days in the geldings receiving EB in microspheres. Daily FSH concentrations decreased (P < .01) in all treated groups, with the greatest response in the geldings receiving EB in microspheres. Prolactin in daily samples increased (P < .01) similarly in all estradiol-treated groups after injection of sulpiride. The LH response to GnRH analog was greatest (P < .05) in geldings receiving EB in oil and estradiol cypionate; the FSH response was not altered by treatment. The prolactin response to TRH was greater (P < .01) in estradiol-treated geldings relative to controls, but did not differ among groups. Compared with the responses to every-other-day EB injections in oil, as we used previously, a single injection of 100 mg estradiol cypionate gave the most similar and consistent responses. Because of these similar responses in this gelding model, it is likely that a single injection of 100 mg estradiol cypionate can be used in lieu of every-other-day injections of EB in oil in the treatment regimen we reported previously for stimulating ovarian activity in seasonally anovulatory mares.  相似文献   

Use of Fetuin Before and During Vitrification of Bovine Oocytes     

G Horvath  GE Seidel Jr 《Reproduction in domestic animals》2008,43(3):333-338

After vitrification of oocytes, fertilization rates and subsequent development are unsatisfactory, possibly due in part to zona hardening. Foetal calf serum (FCS) can prevent zona hardening because of its fetuin content, but FCS composition varies among batches, and may contain viruses. In this study, we therefore compared media supplemented with different sources of macromolecules, 2% bovine serum albumin (BSA), 2% BSA + 1 mg/ml fetuin and 20% FCS, for handling oocytes for 10–30 min prior to vitrification. None of the treatments resulted in developmental rates comparable with the non‐vitrified controls, but FCS inclusion in pre‐vitrification handling medium resulted in higher blastocyst production per oocyte (p < 0.05) (10.8%) on day 9 of culture than BSA (5.3%) or BSA + fetuin (6.4%). Blastocysts developing from oocytes from all vitrification treatments were somewhat retarded relative to those developed from non‐vitrified oocytes. We also tested the use of fetuin during vitrification as well as two different exposure times with cryoprotectants, 180 and 30 s. There was no significant effect of fetuin or exposure time on rates of subsequent blastocyst production.  相似文献   

Hematological and clinical responses to combined mitoxantrone and cyclophosphamide administration to normal cats.     

C J Henry  W G Brewer  Jr    N S Royer 《The Canadian veterinary journal. La revue veterinaire canadienne》1994,35(11):706-708

The purpose of this study was to examine the feasibility of a combination chemotherapy protocol ("CYCLONE") in cats, utilizing mitoxantrone and cyclophosphamide. Three normal adult cats were administered mitoxantrone (6.5 mg/m2 intravenously) and cyclophosphamide (100 mg/m2 intravenously) every 21 days for a total of three doses. Individual white blood cell count nadirs (range, 2.0-9.5 x 10(9)/L) and neutrophil count nadirs (range, 0.3 to 5.0 x 10(9)/L) occurred between days 2 and 10 after each dose of chemotherapy. Mean white blood cell count nadirs (range of mean, 5.5 to 8.4 x 10(9)/L) occurred between days 6 and 8, as did the mean neutrophil count nadir (range of mean, 1.7-4.0 x 10(9)/L). Side effects were limited to transient appetite suppression in one cat and loose stools in two cats. Myelosuppression and gastrointestinal side effects were comparable to those observed with single-agent mitoxantrone protocols. Further investigation of this protocol is warranted.  相似文献   

THE POSSESSION OF PROCLAIMED DRUGS     

S. Smith  Jr 《Australian veterinary journal》1927,3(4):158-159

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