Assessment of the efficacy of an autogenous vaccine against Yersinia pseudotuberculosis in young Merino sheep     

KJ Stanger  H McGregor  M Marenda  JM Morton  JWA Larsen 《New Zealand veterinary journal》2019,67(1):27-35

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Conventional bone plate fixation of distal radius and ulna fractures in toy breed dogs          下载免费PDF全文

JM Ramírez  C Macías 《Australian veterinary journal》2016,94(3):76-80

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Live and inactivated vaccine regimens against caecal Salmonella Typhimurium colonisation in laying hens          下载免费PDF全文

PJ Groves  SM Sharpe  WI Muir  A Pavic  JM Cox 《Australian veterinary journal》2016,94(10):387-393

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Development of a model for investigation of perennial ryegrass toxicosis in sheep     

MD Combs  SH Edwards  JM Scherpenhuizen  EJ Narayan  AE Kessell  J Piltz 《New Zealand veterinary journal》2018,66(6):281-289

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Pyometra and unilateral uterine horn torsion in a sheep          下载免费PDF全文

JM Castillo  JC Dockweiler  SH Cheong  M Diel de Amorim 《Reproduction in domestic animals》2018,53(1):274-277

A 13‐year‐old Romanov sheep presented for evaluation of vaginal discharge, depression and anorexia. Blood work demonstrated mature neutrophilia and marked hyperlactatemia. Transrectal and transabdominal ultrasound revealed echogenic fluid (pus) within the uterus. Purulent uterine fluid culture yield Escherichia coli. A diagnosis of pyometra was made. After medical treatment without clinical improvement, an exploratory laparotomy was performed, and a 360‐degree uterine left horn torsion was identified with the pyometra and multiple corpora lutea on both ovaries. Ovariohysterectomy was performed and the ewe recovered uneventfully.  相似文献   

Nondestructive Estimation of Standing Crop and Fuel Moisture Content in Tallgrass Prairie     

Sonisa Sharma  Tyson E. Ochsner  Dirac Twidwell  J.D. Carlson  Erik S. Krueger  David M. Engle  Samuel D. Fuhlendorf 《Strength and Conditioning Journal》2018,71(3):356-362

Accurate estimation of standing crop and herbaceous fuel moisture content (FMC) are important for grazing management and wildfire preparedness. Destructive sampling techniques have been used to accurately estimate standing crop and FMC, but those techniques are laborious and time consuming. Existing nondestructive methods for estimating standing crop in tallgrass prairie have limitations, and few studies have examined nondestructive estimation techniques for FMC in this environment. Therefore, our objective was to develop robust models for nondestructive estimation of standing crop and FMC in tallgrass prairie. We calibrated and validated stepwise multiple linear regression (SMLR) and artificial neural network (ANN) models for standing crop and FMC using data collected in tallgrass prairies near Stillwater, Oklahoma. Day of year (DOY), canopy height (CH), Normalized Difference Vegetation Index (NDVI), and percent reflectance in five wavelength bands were candidate input variables for the models. The study spanned two growing seasons and nine patches located within three pastures under patch burn management, and the resulting data set with > 3 000 observations was split randomly with 85% for model calibration and 15% withheld for validation. Standing crop ranged from 0 to 852 g m^? 2, and FMC ranged from 0% to 204%. With DOY, CH, and NDVI as predictors, the SMLR model for standing crop produced a root mean squared error (RMSE) of 119 g m^? 2 on the validation data, while the RMSE of the corresponding ANN model was 116 g m^? 2. With the same predictors, the SMLR model for FMC produced an RMSE of 26.7% compared with 23.8% for the corresponding ANN model. Thus, the ANN models provided better prediction accuracy but at the cost of added computational complexity. Given the large variability in the underlying datasets, the models developed here may prove useful for nondestructive estimation of standing crop and FMC in other similar grassland environments.  相似文献   

The Reibergram for immunoglobulin A in dogs: Evaluation of intrathecal IgA synthesis using a quotient graph in dogs with neurological diseases     

Mirja L. Püschel  Fritjof Freise  Regina Carlson  Andrea Tipold  Jasmin Nessler 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2023,37(1):191-203

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Klebsiella to Salmonella gene transfer within rumen protozoa: implications for antibiotic resistance and rumen defaunation     

McCuddin ZP  Carlson SA  Rasmussen MA  Franklin SK 《Veterinary microbiology》2006,114(3-4):275-284

The rumen has long been thought to be a site of gene transfer for microorganisms. Rumen protozoa (RPz) are active predators of bacteria that can harbor antibiotic resistance genes. In this study, RPz were assessed as sites of gene transfer between two bacterial species, Salmonella and Klebsiella. One Klebsiella isolate carried a plasmid bearing bla(CMY-2), encoding an extended-spectrum beta-lactamase conferring ceftriaxone resistance, while the Salmonella was susceptible to ceftriaxone yet capable of thriving within protozoa. In vitro studies revealed that ceftriaxone-resistant Salmonella could be isolated following co-incubation of Salmonella and Klebsiella with RPz obtained from adult cattle and goats. Ceftriaxone-resistant Salmonella were not recovered in the presence of an inhibitor of protozoa engulfment or when a protozoa-sensitive Salmonella was part of the co-incubation. This transfer event was additionally observed in vitro for protozoa-independent stressors although at a significantly lower frequency. The gene transfer event was related to bacterial conjugation since a conjugation inhibitor, nalidixic acid, perturbed the phenomenon. Ceftriaxone-resistant Salmonella were recovered from calves, sheep, and goats co-challenged with ceftriaxone-resistant Klebsiella and ceftriaxone-sensitive Salmonella. However, the transfer event was not observed in calves and sheep that were defaunated prior to the co-challenge. Moreover, Salmonella transconjugants were isolated from separate bovine in vivo studies involving a Klebsiella donor carrying a plasmid conferring colicin activity while no such transconjugants were obtained from defaunated calves. These results provide an important basis for evaluating and preventing the spread of antibiotic resistance and other selective advantages for pathogens present in ruminants.  相似文献   

Hormonal control of second flushing in Douglas-fir shoots     

Cline M  Yoders M  Desai D  Harrington C  Carlson W 《Tree physiology》2006,26(10):1369-1375

Spring-flushing, over-wintered buds of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) produce new buds that may follow various developmental pathways. These include second flushing in early summer or dormancy before flushing during the following spring. Second flushing usually entails an initial release of apical dominance as some of the current-season upper lateral buds grow out. Four hypotheses concerning control of current bud outgrowth in spring-flushing shoots were tested: (1) apically derived auxin in the terminal spring-flushing shoot suppresses lateral bud outgrowth (second flushing); (2) cytokinin (0.5 mM benzyladenine) spray treatments given midway through the spring flush period induce bud formation; (3) similar cytokinin spray treatments induce the outgrowth of existing current lateral buds; and (4) defoliation of the terminal spring-flushing shoot promotes second flushing. Hypothesis 1 was supported by data demonstrating that decapitation-released apical dominance was completely restored by treatment with exogenous auxin (22.5 or 45 mM naphthalene acetic acid) (Thimann-Skoog test). Hypothesis 2 was marginally supported by a small, but significant increase in bud number; and Hypothesis 3 was strongly supported by a large increase in the number of outgrowing buds following cytokinin applications. Defoliation produced similar results to cytokinin application. We conclude that auxin and cytokinin play important repressive and promotive roles, respectively, in the control of second flushing in the terminal spring-flushing Douglas-fir shoot.  相似文献   

The genome of black cottonwood, Populus trichocarpa (Torr. & Gray)   总被引：4，自引：0，他引：4  

Tuskan GA  Difazio S  Jansson S  Bohlmann J  Grigoriev I  Hellsten U  Putnam N  Ralph S  Rombauts S  Salamov A  Schein J  Sterck L  Aerts A  Bhalerao RR  Bhalerao RP  Blaudez D  Boerjan W  Brun A  Brunner A  Busov V  Campbell M  Carlson J  Chalot M  Chapman J  Chen GL  Cooper D  Coutinho PM  Couturier J  Covert S  Cronk Q  Cunningham R  Davis J  Degroeve S  Déjardin A  Depamphilis C  Detter J  Dirks B  Dubchak I  Duplessis S  Ehlting J  Ellis B  Gendler K  Goodstein D  Gribskov M  Grimwood J  Groover A  Gunter L  Hamberger B  Heinze B 《Science (New York, N.Y.)》2006,313(5793):1596-1604

We report the draft genome of the black cottonwood tree, Populus trichocarpa. Integration of shotgun sequence assembly with genetic mapping enabled chromosome-scale reconstruction of the genome. More than 45,000 putative protein-coding genes were identified. Analysis of the assembled genome revealed a whole-genome duplication event; about 8000 pairs of duplicated genes from that event survived in the Populus genome. A second, older duplication event is indistinguishably coincident with the divergence of the Populus and Arabidopsis lineages. Nucleotide substitution, tandem gene duplication, and gross chromosomal rearrangement appear to proceed substantially more slowly in Populus than in Arabidopsis. Populus has more protein-coding genes than Arabidopsis, ranging on average from 1.4 to 1.6 putative Populus homologs for each Arabidopsis gene. However, the relative frequency of protein domains in the two genomes is similar. Overrepresented exceptions in Populus include genes associated with lignocellulosic wall biosynthesis, meristem development, disease resistance, and metabolite transport.  相似文献