345 research outputs found
Management Production Systems and Timing Strategies for Cull Cows
No full textReplaced with revised version of paper 06/04/09.Cattle, cull cows, management, marketing, production systems, timing, Farm Management, Marketing,
Mrs. Keir, Mrs. Cull and Fred Cull
No full textPhotograph - Two women (Mrs. Keir, Mrs. Cull and Fred Cull) and four children sitting in a car in front of a house. Athabasca, Albert
Experimental data associated with the study "The Ixodes scapularis symbiont Rickettsia buchneri inhibits growth of pathogenic Rickettsiaceae in tick cells: implications for vector competence"
No full textSpreadsheets containing raw data from fluorescent plate reader experiments detailed in the research paper.These experimental data are made available as part of the study "The Ixodes scapularis symbiont Rickettsia buchneri inhibits growth of pathogenic Rickettsiaceae in tick cells: implications for vector competence" published in Frontiers in Veterinary Science.
Abstract: The blacklegged tick Ixodes scapularis is a vector of pathogens of medical and veterinary importance in North America. Unlike other important human-biting Ixodes species however, this tick does not transmit pathogenic Rickettsia species, instead hosting a rickettsial endosymbiont, Rickettsia buchneri. A gene cluster encoding aminoglycoside antibiotic biosynthesis machinery has been identified in R. buchneri, which is not present in other rickettsiae, and therefore antibiotic production might represent a mechanism by which the endosymbiont is able to exclude pathogenic Rickettsia species from I. scapularis. This study identifies a second antibiotic cluster in R. buchneri with genes similar to polyketide/non-ribosomal peptide synthesis genes. Using cell culture experiments we provide evidence that infection of tick cells with R. buchneri, even at low rates, significantly reduces the ability of the pathogens Anaplasma phagocytophilum and R. parkeri to infect and replicate in cells, whereas the presence of low-pathogenic R. amblyommatis or the endosymbiotic R. peacockii in cells only partially reduced infection by R. parkeri. This research suggests a potential role of the endosymbiont in preventing other rickettsiae from colonizing I. scapularis and/or being transmitted transovarially. Whilst a link between the observed inhibition and antibiotic production is yet to be confirmed, this work contributes further to our understanding of rickettsial competition and how endosymbionts might alter vector competence by preventing colonization of the tick by pathogens.National Institutes of Health (grants R01 AI49424 and R01 AI081690 to UGM)University of Minnesota Agricultural Experiment StationCull, Benjamin; Burkhardt, Nicole Y; Wang, XinRu; Thorpe, Cody J; Oliver, Jonathan D; Kurtti, Timothy J; Munderloh, Ulrike G. (2021). Experimental data associated with the study "The Ixodes scapularis symbiont Rickettsia buchneri inhibits growth of pathogenic Rickettsiaceae in tick cells: implications for vector competence". Retrieved from the University Digital Conservancy, https://doi.org/10.13020/ZQXG-JF78
Harvey Cull
No full textPhotograph - Harvey Cull inside his drugstore, Athabasca Pharmacy, Athabasca, Albert
(One Less) Manifesto for a Theatre of Immanence
No full textThis chapter provides an introduction to the complex notion of 'immanence' as it appears in the work of Gilles Deleuze before going on to explore the implications of this concept for performance practice. In parallel, the chapter also includes a manifesto for an immanent performance practice, including images created by the author
‘Cull or vaccinate? Badger politics in Wales’
No full textIn this sequel to an article on the badger-cull published in the April issue of 2010, the author provides an update on what is happening to the culls announced for North Pembrokeshire and for England
Mrs. Gordon, Mrs. Cull, Mrs. Falconer, Mrs. Evans and Mrs. MacIntyre
No full textPhotograph - Five women (Mrs. Gordon, Mrs. Cull, Mrs. Falconer, Mrs. Evans and Mrs. MacIntyre) sitting on the porch of a house, Athabasca, Albert
Survivorship approaches to measuring and comparing cull rates for dairies
No full textRecords of 19 482 cows from 9 herds in the San Joaquin Valley of California, USA, were used to estimate culling rate in dairy herds. The cull rate derived from data on non-culled cows was estimated as the weighted slope of the cumulative proportion of cows remaining in a herd after first parturition, where cumulative proportion was computed using a cohort life-table with intervals of 1 month. Cull rates ranged from 9.0 to 13.8% per 12 months of age, compared with culling density rates of 22.2 to 39.7 culled per 100 cow-years. It is suggested that variation in culling among herds during the first lactation, and particularly during the first part of the first lactation, may be an important consideration in future studies of optimal culling practices. A survivorship approach to measuring culling provides an estimate of the rate of removal that is not biased by age, in contrast with currently used methods.ID: 6688; Accession Number: 19972209394. Publication Type: Journal Article. Language: English. Number of References: 8 ref. Subject Subsets: Veterinary Science; Veterinary Science; Dairy ScienceSource type: Electronic(1)http://search.ebscohost.com/login.aspx?direct=true&db=lah&AN=19972209394&site=ehost-liv
Art LaPorte, Harvey Cull, A. Gorman, P. Kawulok and F. Falconer
No full textPhotograph - A group of men with guns, standing in front of a sleigh and building, Athabasca, Alberta. Pictured are: Art LaPorte, unknown, Harvey Cull, A. Gorman, P. Kawulok and F. Falcone
Canadian National Dairy Study: Describing Canadian dairy producer practices and perceptions surrounding cull cow management
No full textFarmer decisions surrounding culling have an important effect on the health and welfare of cull cows. The objectives of this study were to describe the self-reported shipment behaviors of Canadian dairy producers and understand farmer perspectives on the factors that were most influential in their decision to cull a cow. A nationwide survey was administered between March and April 2015 that included 192 questions covering producer background information, farm characteristics, biosecurity practices, disease prevalence, calf health, cow welfare, lameness, milking hygiene, reproduction, and Internet and social media use. The survey yielded a 12% response rate; a total of 1,076 respondents (78% of all survey respondents completed the culling section of the survey) were included in this study for analysis. Approximately 80, 51, and 38% of respondents reported shipping at least 1 cow to auction, direct to slaughter, and to another dairy farm in the past 12 mo, respectively. Ability of the cow to remain standing (93% of respondents) and drug withdrawal times (92% of respondents) were identified as the most important factors for consideration when culling cows. The time between culling decision and when the cow was actually transported was longer for lame cows than sick cows; almost 70% of respondents reported that cows culled for illness were typically shipped within 1 wk of culling decision, whereas only 51% of respondents indicated the same was true for lame cows. Last, Canadian dairy producers generally exhibited strong confidence that their culled cows would arrive at slaughter in the same condition as they left, but felt very unsure about knowing the location of their final destination. These results highlight several gaps between producer perceptions and the true situation, and can be used to develop tailored programs and inform policy and regulatory decisions aimed at improving cull cow decisions and cow welfare.Dairy Farmers of CanadaAgriculture and Agri-Food Canad
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