A5057834813- Reproductive Physiology in Livestock
- Ruminant Nutrition and Digestive Physiology
- Effects of Environmental Stressors on Livestock
- Animal health and immunology
- Genetic and phenotypic traits in livestock
- Meat and Animal Product Quality
- Animal Behavior and Welfare Studies
- Muscle metabolism and nutrition
- Medical and Biological Sciences
- Antibiotics Pharmacokinetics and Efficacy
- Milk Quality and Mastitis in Dairy Cows
- Animal Nutrition and Health
- Muscle Physiology and Disorders
- Cyclone Separators and Fluid Dynamics
- Helminth infection and control
- Eosinophilic Esophagitis
- Gastrointestinal disorders and treatments
- Soil and Water Nutrient Dynamics
- Elbow and Forearm Trauma Treatment
- Isotope Analysis in Ecology
- Cancer therapeutics and mechanisms
- Viral gastroenteritis research and epidemiology
- Diagnosis and Treatment of Venous Diseases
- Thermoregulation and physiological responses
- Infant Health and Development
Virginia–Maryland College of Veterinary Medicine
2009-2023
Virginia Tech
2009-2021
Abstract The objective of this study was to investigate the effect short-term elevated ambient temperature on ruminal volatile fatty acid (VFA) dynamics and rumen epithelium gene expression associated with transport metabolism VFA. Eight ruminally cannulated Holstein heifers (200 kg) were used in a factorial, repeated measures experiment two treatments periods. During first period, animals provided feed ad libitum housed at 20 °C. second one group (HS) 30 °C fed libitum. other (PF) pair-fed...
The objective of this study was to determine the association neonatal calf diarrhea (NCD) with step activity and lying behaviors in pre-weaned dairy calves. Calves were housed individual hutches for first 6 days life, then moved into a group pen. On day birth, calves (n = 30) fitted an accelerometer, recorded. assigned fecal score (FS) twice daily using 0 3 scale, diagnosed NCD 10) when 3. To ensure only noted due NCD, that had any other health complications excluded from analyses 1). pair...
Preweaning diet is known to affect rumen tissue appearance at the gross level. The objectives of this experiment were investigate effects different preweaning diets on growth and development epithelium putative epithelial stem progenitor cell measurements gene levels. Neonatal Holstein bull calves (n = 11) individually housed randomly assigned 1 2 diets. milk replacer only (MRO; n 5) or with starter (MRS; 6). Diets isoenergetic (3.87 ± 0.06 Mcal metabolizable energy per day) isonitrogenous...
Ofloxacin, its optical isomers levofloxacin (HR 355, DR-3355) and D-ofloxacm (DR-3354) ciprofloxacin were administered orally to mice rats which had systemic localized infections. Both equally effective in treating murine infections caused by staphylococci, Enterobacteriaceae or Pseudomonas aeruginosa with ED50S ranging from 0·18 15·8 mg/kg 0·42 16·3 respectively both these agents twice as ofloxacin an ED50 0·41 39·7 mg/kg. In contrast, D-ofloxacin was either inactive exhibited only modest...
The objective of this study was to determine the effect early weaning followed by a period high-grain feeding on plasma acetate kinetics and signaling protein phosphorylation in LM tissue growing steers. We hypothesized that grain would result altered cell use support observed improvements carcass gain marbling. Fall-born Angus × Simmental steers were weaned at 106 ± 4 d age (early [EW]; n = 6) fed diet for 148 or remained with their dams (normal [NW]; pasture until 251 5 age. Both...
This study aimed to characterize the effects of increased milking frequency (IMF) at early and mid-lactation on milk yield its association with changes in cistern alveolar capacity. Fourteen multiparous Holstein cows were subjected IMF using unilateral frequent method from 3 24 d (DIM). At mid-lactation, randomly assigned 1 2 treatments: control or repeated. From 150 170 DIM, treatment was reimposed repeated group. During IMF, left udder halves milked 2× right 4× daily. To separate...
Abstract Objective To determine the influence of two methods rumen cannulation on postoperative animal welfare. Study design Experimental study. Animals Twelve commercial wethers (n = 6 per group). Methods Group 1 underwent a one‐step procedure to place cannula immediately after fistulation skin. 2 two‐step in which portion was externalized and held with clamp for 9 days, placed into fistula created by removal clamped tissue. Feed intake vital signs were monitored daily 24 days...
Dairy cows are predisposed to diseases during the postpartum period. Dystocia has been associated with increased risk for disease, which is likely result of tissue trauma and stress prolonged parturition. To attenuate inflammatory response seen in dystocic animals improve well-being, we assessed effects a glucocorticoid, dexamethasone administered within 12 h after calving. was defined as difficult birth resulting calving (≥70 min amniotic sac appears) monitored through 3 video cameras...
Artificial insemination (Al) is used by only approximately 10% of beef producers in the United States. Estrus synchronization and timed AI (TAI) minimize time labor relative to heat detection; however, these factors are still a big constraint for producers. In literature, conception rates following TAI using various protocols range from 30 65%. One commonly protocol CO-Synch, which consists shot GnRH on day 0, PGF2a 7, another at breeding (72 hours after PGF2a). Several variations CO-Synch...
Artificial insemination (AI) is a highly effective reproductive technology for promoting genetic improvement in beef cattle. The most commonly used timed-AI program cattle the CO-Synch program. Pregnancy rates achieved through this have ranged from 31 to 66% across series of published reports, rate that acceptable many producers. It has been shown reducing interval initial GnRH treatment PGF2a (and withdrawal progestin) improves outcome timed-AI. With protocol, termed 5-day Co-Synch+ CIDR...
Abstract The objective of this study was to compare post-operative recovery sheep undergoing one two methods cannulation. Twelve commercial wethers were assigned a surgical treatments (1-step cannulation or 2-step cannulation) and monitored post-operatively. In the 1-step treatment cannula fitted during surgery; in procedure, rumen wall is externalized clamped off for 7 days, after which fitted. Surgeries performed on 2 consecutive days by same surgeon with balanced across surgery day. Dry...