A5060254887- Effects of Environmental Stressors on Livestock
- Animal Behavior and Welfare Studies
- Milk Quality and Mastitis in Dairy Cows
- Ruminant Nutrition and Digestive Physiology
- Genetic and phenotypic traits in livestock
- Reproductive Physiology in Livestock
- Agriculture and Farm Safety
- Meat and Animal Product Quality
- Body Composition Measurement Techniques
- Vector-Borne Animal Diseases
- Soil Mechanics and Vehicle Dynamics
- Urban Heat Island Mitigation
- Agriculture and Biological Studies
- Animal Disease Management and Epidemiology
- Microbial infections and disease research
- Agriculture Sustainability and Environmental Impact
- Veterinary Pharmacology and Anesthesia
- Indoor Air Quality and Microbial Exposure
- Veterinary Equine Medical Research
- Pharmaceutical and Antibiotic Environmental Impacts
- Natural Fiber Reinforced Composites
- Gut microbiota and health
- Pregnancy-related medical research
- Animal health and immunology
- Health and Wellbeing Research
University of California Division of Agriculture and Natural Resources
2021-2025
University of California, Davis
2021
University of Tennessee at Knoxville
2016-2020
University of Kentucky
2013
The current study objective was to investigate the risk factors associated with isolation of antimicrobial-resistant Escherichia coli, Enterococcus spp., and Streptococcus spp. (ES) from feces dairy cows in California (CA). A longitudinal conducted on ten dairies, a random sample cattle (late pregnant heifers dry cows) stratified by each herd's parity distribution were followed monthly close-up 120 days milk during fall winter 2018 (winter season) spring summer 2019 (summer season)....
The objectives of this study were to determine the effect dry cow management system (pasture or confined) on: (1) lying behaviour and activity; (2) feeding heat stress behaviours; (3) intramammary infections, postpartum. Non-lactating Holstein cows assigned either deep-bedded, sand freestalls ( n = 14) pasture using rolling enrollment. At dry-off, equipped with an accelerometer daily time (h/d), bouts (bouts/d), steps (steps/d) divided into periods: far-off (60 15 d prepartum), close-up (14...
This study describes the occurrence of antimicrobial resistance (AMR) in commensal Escherichia coli and Enterococcus/Streptococcus spp. (ES) isolated from fecal samples dairy cows assesses variation AMR profiles across regions seasons following implementation Food Agricultural Code (FAC) Sections 14400-14408 (formerly known as Senate Bill, SB 27) California (CA).The was conducted on ten dairies distributed CA's three milk sheds: Northern (NCA), San Joaquin Valley (NSJV), Greater Southern...
Lameness is a major welfare concern in the dairy industry, and access to physical activity during dry period may improve hoof health. The objective of this study was determine effects forced exercise, pasture turnout, or total confinement cows on horn growth wear sole thickness. Twenty-nine primiparous 31 multiparous, pregnant, nonlactating Holstein (n = 58) Jersey-Holstein crossbred 2) were assigned either 20), exercise 20) treatments at dry-off using rolling enrollment from January...
OBJECTIVE To determine the effects of stacked wedge pads and chains applied to forefeet Tennessee Walking Horses on behavioral biochemical indicators pain, stress, inflamation. ANIMALS 20 Horses. PROCEDURES were randomly assigned 2 treatment groups: keg shoes (control; n = 10) or exercise with (10). Ten days before application, an accelerometer was attached at left metatarsus each horse record daily activity. exercised for minutes daily, beginning day -7. On 0, ceased, trimmed, applied. From...
In 2019, California accounted for approximately 40% of organic products in the US, and dairy milk were top commodity state. The objective this study was to describe cattle farmers' management practices perceptions diseases California. A survey inquiring about farm history demographics, animal diseases, parasite problems, housing pasture management, education, mailed 160 farms, which 36 (22.5%) responded. Among respondents, majority (83.9%) located Northern California; median size 310 cows,...
Compost bedded pack (CBP) barns have been receiving increased attention as an alternative housing system for dairy cattle. To create a satisfactory environment within CBP that promotes good composting process, adequate air movement and minimal temperature fluctuations throughout the building are required. Therefore, study based on compost barn structure model employing techniques of dimensional analysis naturally ventilated buildings was developed. Three-dimensional computational fluid...
The study objective was to determine the effects of trimming switch dairy cows on teat-end bacterial counts and udder hygiene scores. Cows (n = 102) were blocked by days in milk, milk production, parity then assigned (a) treatment (trimming their tail using a commercially available trimmer), or (b) control (unaltered tails). Udder recorded for Days 0 (initiation treatment), 32, 64. A subset 21) used assess Streptococci coliform populations teat ends. Samples collected swabbing left front end...
Among animal facilities, compost-bedded pack (CBP) barns have attracted a lot of attention from milk producers and the scientific community. Systematic investigation main thermal properties utilizing sawdust in CBP is environmental economic relevance. In this paper, aim was to (a) develop predictive equations for conductivity (k) compost bedding as function moisture content (MC), degree compaction (DCo), particle size (PS); (b) investigate links between k depth within material. Samples...
The objective was to determine the effect of prepartum exercise, pasture turnout, or total confinement on activity and immune competence dairy cows. Sixty pregnant, nonlactating cows were assigned control (19 Holstein 1 Jersey × Holstein), exercise (20 Holstein) treatments using rolling enrollment from Jan. Nov. 2015 at dry-off. Cows balanced by parity (1.8 ± 0.9), projected ME fat-corrected milk yield (13,831 2,028 kg/lactation), due date. housed in a naturally ventilated, 4-row deep-bedded...
At the udder level, increasing milk flow rate at which milking is terminated, shortens time and increases efficiency in automatic systems (AMS). It hypothesized that this can be improved upon by setting quarter regardless of feed availability. The objective study was to investigate effect level rates (0.06, 0.3, or 0.48 kg/min) applied with without teaser on time, yield, SCC degree emptying, cows a FeedFirst™ AMS system. Thirty were assigned six groups, balanced parity (2.9 ± 1.5), days (142...