Keith A. Bryan

ORCID: 0000-0001-5640-4803
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About
Contact & Profiles
Research Areas
  • Infant Nutrition and Health
  • Viral gastroenteritis research and epidemiology
  • Gut microbiota and health
  • Milk Quality and Mastitis in Dairy Cows
  • Salmonella and Campylobacter epidemiology
  • Animal health and immunology
  • Ruminant Nutrition and Digestive Physiology
  • Probiotics and Fermented Foods
  • Effects of Environmental Stressors on Livestock
  • Clostridium difficile and Clostridium perfringens research
  • Enterobacteriaceae and Cronobacter Research
  • Animal Nutrition and Physiology

National Hansen's Disease Program
2023-2025

Probiotics are a promising intervention for modulating the microbiome and immune system, promoting health benefits in cattle. While studies have characterized calf lung bacterial profile with without oral probiotics, simultaneous probiotic effects on populations of multiple sites along respiratory tract not been characterized. This study utilized same pre-weaning diary group from our previous to characterize present nostril tonsil across control treatment groups nine sampling time points....

10.3389/fmicb.2024.1499531 article EN cc-by Frontiers in Microbiology 2025-01-08

Introduction Probiotics have been investigated for their many health benefits and impact on the microbiota of gut. Recent data also supported a gut–lung axis regarding bacterial populations (microbiomes) two locations; however, little research has performed to determine effects oral probiotics microbiome bovine respiratory tract. We hypothesized that probiotic treatment would result in changes lung as measured lavage fluid. Our overall goal was characterize lungs calves fed milk replacer dry...

10.3389/fmicb.2023.1298570 article EN cc-by Frontiers in Microbiology 2024-01-05

Clostridium perfringens is a spore-forming, anaerobic bacterium which produces toxins and exoenzymes that cause disease in calves, especially necro-hemorrhagic enteritis-associated diarrhea often resulting death. infections are currently being treated with antibiotics, but even the prudent administration of there significant rates recurrence. Probiotics, an alternative to commonly employed prevent clostridial infections. The objectives our study were demonstrate two commercially available...

10.3390/antibiotics11111513 article EN cc-by Antibiotics 2022-10-29

Salmonella enterica, which causes typhoid fever, is one of the most prevalent food-borne pathogens. Salmonellosis in cattle can greatly impact a producer’s income due to treatment costs, decreased productivity herd, and mortality disease. Current methods prevention for salmonellosis consist antibiotics vaccinations, but neither these options are perfect. Probiotics, categorized as antibiotic alternatives, living microorganisms that added animal feeds appropriate quantities order benefit...

10.3390/antibiotics11101328 article EN cc-by Antibiotics 2022-09-29

Probiotics have been investigated for many health benefits; however, few studies performed to determine the effects of oral probiotics on peripheral blood and respiratory immune cells in cattle. Our objectives were changes growth status, differential cell counts function, lung function using flow cytometry PCR dairy calves fed a milk replacer with (PRO, N = 10) or without (CON, addition dry rations from birth weaning. Performance clinical scores not different between treatment groups....

10.3390/microorganisms11112620 article EN cc-by Microorganisms 2023-10-24

Objectives were to evaluate the effects of a 4-strain direct fed microbial (DFM) on gastrointestinal tract (GIT) permeability and inflammation during feed restriction (FR) in heifers. Holstein heifers (n = 32; mean ± SD; 295 25 kg BW; 287 17 d age) utilized an experiment conducted 2 replicates (16/replicate). Heifers randomly assigned 1 top-dressed dietary treatments: 1) control (CON; 10 g/d dried lactose; n 16) or 2) DFM containing commercial blend Lactobacillus animalis, Propionibacterium...

10.3168/jdsc.2023-0402 article EN cc-by JDS Communications 2023-11-17
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