24,710 results match your criteria: "University of Guelph; kwootton@uoguelph.ca.[Affiliation]"

Three extruded dog diets were created for a nutritional study with different primary protein sources (BAS: lamb meal (LM) and deboned lamb (DL); CHK: chicken meal, LM, and DL; PEA: dried ground pea, LM, and DL). All diets were processed using the same single-screw extruder, shipped from the processing facility on the same day, and transported under the same conditions in January 2021. After 8 months of storage in a temperature and humidity-controlled room in September 2021, only the PEA diet was molded upon inspection.

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  • The FLO genes in Saccharomyces cerevisiae are regulated by heterochromatin and various cellular factors, with mutations in the POL30 gene affecting gene expression but not specifically the FLO loci.
  • Mutations in both POL30 and deletions in replisome stability factors RRM3 and TOF1 led to increased flocculation, showing stronger expression of the FLO11 promoter and altered RNA levels.
  • The findings suggest that interactions between POL30, RRM3, and TOF1 are crucial for maintaining epigenetic stability at the FLO11 locus, impacting both active and silent states of gene expression.
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Peritumoral Edema in Canine Extra-Axial Brain Tumours: Effect of Steroids.

Vet Comp Oncol

November 2024

Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada.

This multicenter retrospective study evaluated the effects of a time delay and steroids on the volume of peritumoral edema (VPTE) in dogs with extra-axial brain tumours. The hypothesis is that VPTE will decrease between the diagnostic (MRI-1) and RT planning (MRI-2) MRIs following the administration of steroids. Inclusion required paired MRI acquisitions within 3 months, with VPTE contouring for each MRI registered to the RT planning CT.

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  • Divergence between closely related organisms, like the Guinan toad-headed lizards found in the Mugetan Desert, can occur without geographic barriers, raising questions about how selection, gene flow, and recombination facilitate this process.
  • Researchers sampled 191 lizard specimens and performed whole genome sequencing, finding continuous gene flow across the desert despite noticeable color differences between populations.
  • They identified 273 highly diverged regions in the genome that showed strong selection, influencing key genes related to color variation and potentially contributing to the evolutionary divergence in these lizards.
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Choline is an essential nutrient required for proper functioning of organs and serves as a methyl donor. In liver where choline metabolism primarily occurs, glucose homeostasis is regulated through insulin receptor substrates (IRS) 1 and 2. The objective of this research was to determine the role of prenatal choline as a modulator of metabolic health and DNA methylation in liver of offspring and dams.

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Freeze-dried fecal microorganisms as an effective biomaterial for the treatment of calves suffering from diarrhea.

Sci Rep

November 2024

International Education and Research Center for Food and Agricultural Immunology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aoba, Aramaki, Aoba-Ku, Sendai, Miyagi, 980-8572, Japan.

Fecal microbiota transplantation (FMT) is a therapeutic modality for treating neonatal calf diarrhea. Several practical barriers, including donor selection, fecal collection, and a limited timeframe for FMT, are the main constraints to using fresh feces for implementing on-farm FMT. We report the utility of FMT with pretreated ready-to-use frozen (F) or freeze-dried (FD) microorganisms for treating calf diarrhea.

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Why do we care so much for friends-much more than one might predict from reciprocity alone? According to a recent theory, organisms who cooperate with each other come to have a stake in each other's well-being: A good cooperator is worth protecting-even anonymously if necessary-so they can be available to cooperate in the future. Here, we present three experiments showing that reciprocity creates a stake in a partner's well-being, such that people are willing to secretly pay to protect good cooperative partners, if doing so keeps those partners available for future interaction. Participants played five rounds of a cooperative game (Prisoner's Dilemma) and then received an opportunity to help their partner, without the partner ever knowing.

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The Na-K-ATPase is a critical regulator of ion homeostasis during contraction, buffering interstitial K accumulation, which is linked to muscle fatigue during intense exercise. Within this context, we adopted a recently reported methodology to examine exercise-induced alterations in maximal Na-K-ATPase activity. Eighteen trained healthy young males completed a repeated high-intensity cycling protocol consisting of three periods (EX1-EX3) of intermittent exercise.

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  • * Reviewed medical records and lymph node aspirate smears of 23 dogs from 2016 to 2024, focusing on myeloid blasts and confirming myeloid lineage through flow cytometry.
  • * Findings showed that 39% of dogs presented with lymphadenopathy, and 69% of those treated lived longer than 30 days; emphasizes the need for careful examination of blood tests and smear features for accurate diagnosis.
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Adaptive multi-paddock (AMP) grazing has been promoted to increase soil organic carbon (SOC) stocks over continuously grazed (CG) pastures; however, the evidence for this is still limited, both in terms of the number of studies conducted and the climates and biomes they cover. The objectives of this study were to determine the effect of grazing management on pasture SOC stocks and to incorporate this SOC sequestration into a life cycle assessment on the greenhouse gas (GHG) intensity (or carbon footprint) of Ontario beef production. Soil cores collected from AMP and CG pastures and annual row crop fields in southern Ontario showed that pastures managed with AMP grazing had significantly higher SOC stocks than CG pastures.

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Veterinary ethics and companion animal euthanasia: what can we learn from critical disability studies?

Front Vet Sci

October 2024

Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, ON, Canada.

Within veterinary ethics and practice around companion animal end-of-life and euthanasia, the political and cultural dimensions of death and dying are rarely addressed. This reduces the ability to engage with questions like: what future potential goods (positive affective states, meaning) could an animal experience by continuing to live; what constitutes a life worth living; and how can we make this decision for another being? These are questions that have been subject to extensive dialogue within Critical Disability Studies. The aim of this paper is to provide an analysis of how core considerations from Critical Disability Studies could be useful in veterinary ethics when considering companion animal end of life and euthanasia.

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Surveillance is essential in the fight against antimicrobial resistance (AMR), to monitor the extent of resistance, inform prevention, control measures, and evaluate intervention progress. Traditional surveillance methods based on phenotypic antimicrobial susceptibility data offer important but limited insights into resistance mechanisms, transmission networks, and spread patterns of resistant bacterial strains. Fortunately, genomic technologies are increasingly accessible and can overcome these limitations.

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We investigated the long-term effects of prenatal nutrition on pre-slaughter Nelore bulls using integrative transcriptome and metabolome analyses of liver tissue. Three prenatal nutritional treatments were administered to 126 cows: NP (control, mineral supplementation only), PP (protein-energy supplementation in the third trimester), and FP (protein-energy supplementation throughout pregnancy). Liver samples from 22.

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Pressure-Induced Microvascular Reactivity With Whole Foot Loading Is Unique Across the Human Foot Sole.

Microcirculation

January 2025

Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada.

Background: Foot sole plantar pressure generates transient but habitual cutaneous ischemia, which is even more exacerbated in atypical gait patterns. Thus, adequate post-occlusive reactive hyperaemia (PORH) is necessary to maintain skin health. Plantar pressure regional variance during daily tasks potentially generates region-specific PORH, crucial for ischemic defence.

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Canine mast cell tumours (MCTs) are one of the most common skin cancers of dogs. Surgical removal is the primary treatment, but recurrence and metastasis can occur even with low-grade tumours. As a result, new treatment strategies are being sought.

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  • * A study assessed 293 Canadian dairy farms to identify risk factors for high FFA, finding that 10% of herds had elevated levels, with milking frequency and system type being significant factors.
  • * Farms that milked cows three or more times per day, especially using automated systems or tie stalls, showed higher FFA levels, especially if they did not maintain equipment properly, such as changing milk filters regularly.
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Peanut web blotch is an important leaf disease caused by , which seriously affects the quality and yield of peanuts. However, the molecular mechanisms of peanut resistance to peanut web blotch are not well understood. In this study, a transcriptome analysis of the interaction between peanut () and revealed that total 2989 (779 up- and 2210 down-regulated) genes were all differentially expressed in peanut leaves infected by at 7, 14, 21 days post inoculation.

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The poultry industry plays a crucial role in global food production, with chickens being the most widely consumed as a rich protein source. However, infectious diseases pose significant threats to poultry health, underscoring the need for rapid and accurate detection to enable timely intervention. In recent years, biosensors have emerged as essential tools to facilitate routine surveillance on poultry farms and rapid screening at slaughterhouses.

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  • - The paper offers an in-depth analysis of biomarkers associated with head and neck cancer (HNC), discussing key proteins and genes that play significant roles in the disease's development and progression.
  • - Important genes linked to HNC progression include AURKA, HMGA2, and others, while specific microRNAs (OncomiRs) are shown to promote tumor growth, with some, like hsa-miR-155-3p, indicating potential for prognosis.
  • - Future research should focus on applying precision medicine and advanced therapies, including AI, to enhance personalized treatment approaches for better patient outcomes in HNC care.
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The prevention of diabetic foot ulcers remains a critical challenge. This study evaluates a smart compression sock designed to address this issue by integrating temperature, plantar pressure, and blood oxygen sensors and monitoring data recorded by these sensors. The smart sock, developed with input from a certified Pedorthist, was tested on 20 healthy adult participants aged 16 to 53.

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Keel bone damage (KBD) is a major welfare concern for laying hens. Environmental complexity during rearing is suggested to promote skeletal development and reduce KB fractures (KBF). We investigated the effect of rearing environment and genetic strain on KB development and health.

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  • Aquatic ecosystems like Lake Wilcox harbor diverse bacterial strains, many of which can potentially harm humans, highlighting a significant health risk.
  • Among 11 bacterial isolates studied, 67% were identified as potential human pathogens, indicating considerable genetic diversity and a reservoir for multiple pathogenic strains.
  • The research uncovered widespread antibiotic resistance, particularly to β-lactams and tetracycline, emphasizing the importance of monitoring pathogens in such ecosystems to understand their genetic evolution and ecological impact.
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Ankole-Watusi cattle, , have a unique wide-based horn structure with a large communication to the frontal sinus compared to other cattle breeds. A total of 6 cases of cornual sinusitis presented at the Toronto Zoo and Disney's Animal Kingdom Lodge® and ® Theme Park with a head tilt. Clinically, 4 of the 6 cases had concurrent otitis at the time of initial clinical observation.

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