A5069001249- Reproductive Physiology in Livestock
- Reproductive Biology and Fertility
- Genetic and phenotypic traits in livestock
- Effects of Environmental Stressors on Livestock
- Ruminant Nutrition and Digestive Physiology
- Ovarian function and disorders
- Animal health and immunology
- Animal Behavior and Welfare Studies
- Salmonella and Campylobacter epidemiology
- Microbial infections and disease research
- Animal Disease Management and Epidemiology
- Reproductive tract infections research
- Fatty Acid Research and Health
- Sperm and Testicular Function
- Assisted Reproductive Technology and Twin Pregnancy
- Seed Germination and Physiology
- Veterinary Equine Medical Research
- Viral gastroenteritis research and epidemiology
- Reproductive System and Pregnancy
- Agriculture Sustainability and Environmental Impact
- Birth, Development, and Health
- TGF-β signaling in diseases
- Diphtheria, Corynebacterium, and Tetanus
- Food Safety and Hygiene
- Veterinary medicine and infectious diseases
The Ohio State University
2017-2024
Institute of Developmental Physiology
2023
Division of Undergraduate Education
2023
University of Alberta
2022
University of Wisconsin–Madison
2014-2019
University of Saskatchewan
2011-2016
Saskatchewan Ministry of Agriculture
2013
The objectives of this study were to evaluate the effects daily top-dressing (individually feeding on top total mixed ration) with rumen-protected methionine (RPM) from 30 ± 3 until 126 Days in milk productive and reproductive performance lactating dairy cows. A 309 Holstein cows (138 primiparous 171 multiparous) randomly assigned treatment diets containing either RPM (21.2 g + 38.8 dried distillers grain; 2.34% Methionine [Met] metabolizable protein [MP]) or Control (CON; 60 1.87% Met MP)....
Maintenance of the corpus luteum (CL) during pregnancy is essential for continuing elevated circulating progesterone (P4) that required to maintain pregnancy. The mechanisms protect CL early when non-pregnant animal would typically undergo regression have been extensively investigated. It clear uterine prostaglandin F2α (PGF) causes in ruminants and maintenance dependent upon secretion interferon-tau (IFNT) from elongating embryo. A number specific appear be activated by IFNT. Most studies...
On-animal sensors are revolutionising livestock farming by automating individual animal monitoring. Rumination is closely linked to cow health and physiology a perfect candidate for monitoring using on-animal sensors. The purpose of the current study was determine if tri-axial accelerometer ear-tag could be used detect rumination behaviour in eight multiparous Angus crossbreed cows housed semi-enclosed barn. Different machine learning algorithms (classification regression tree, random...
In ruminants, uterine pulses of prostaglandin (PG) F2α characterize luteolysis, while increased PGE2/PGE1 distinguish early pregnancy. This study evaluated intrauterine (IU) infusions PGF2α and PGE1 on corpus luteum (CL) function gene expression. Cows day 10 estrous cycle received 4 IU (every 6 h; n = 5/treatment) saline, (2 mg PGE1), (0.25 PGF2α), or + PGF2α. A luteal biopsy was collected at 30 min after third infusion for determination expression by RNA-Seq. As expected, decreased (P <...
Selection of a single dominant follicle from cohort growing follicles is unique biological process, key step in female reproductive function monovular species, and lies at the core technologies cattle. Follicle growth number that ovulate are regulated by precise endocrine, paracrine, autocrine mechanisms. Most our current understanding about selection focuses on role FSH, LH, IGF family follicle. However, more recently members TGF-ß has been highlighted, particularly high fecundity genotypes...
To compare the recovery rates of Campylobacter fetus subsp venerealis (Cfv) from preputial scrapings infected bulls with passive filtration on selective medium versus nonselective medium, and without transport medium.217 12 (4 naturally 8 artificially Cfv).Preputial were collected in 2 mL PBS solution bacteriologically cultured directly Skirrow or passively filtered through 0.65-μm filters onto blood agar, 24 hour preincubation modified Weybridge enrichment (TEM). After 72 hours, plates...
A major gene for bovine ovulation rate has been mapped to a 1.2 Mb region of chromosome 10. Screening coding regions positional candidate genes within this failed reveal causative polymorphism, leading the hypothesis that phenotype results from differences in expression rather than alteration structure. This study tested granulosa cells between carriers and noncarriers high fecundity allele, as well characterizing transcriptomic profile genotypes. Five five noncarriers, female descendants...
Abstract Objective —To determine clinical sensitivity and specificity of a quantitative real-time PCR (qRT-PCR) assay for Campylobacter fetus subsp venerealis (Cfv) in preputial samples bulls. Animals —313 beef Procedures —Preputial were collected from 300 virgin bulls 13 Cfv-infected Specificity the qRT-PCR assay, determined on basis results bulls, was compared with bacteriologic culture performed transport enrichment medium (TEM). Sensitivity multiple at weekly intervals infected direct...
The acquisition of dominance and ovulatory capacity was evaluated in follicles from cows that were carriers or half-sibling noncarriers the Trio allele.Follicle size at follicular determined by evaluating whether ovulate after GnRH challenge (ovulatory capacity-experiment 1) determination intrafollicular concentrations estradiol free insulin like growth factor 1 (IGF1) relative mRNA expression cytochrome P450 family 19 subfamily A member (CYP19A1), luteinizing hormone/choriogonadotropin...
The benefit of ovarian superstimulation using exogenous FSH before ovum pick-up (OPU) and in vitro embryo production (IVEP) has been the subject conflicting results. objective present study, therefore, was to evaluate effect use dose porcine (p-FSH) OPU/IVEP on response pregnant heifers. Pregnant Holstein heifers (n = 48) were randomly assigned receive 0, 160, or 300 mg NIH-FSH-P1 a crossover design. Ovum performed at 49, 63, 77 d gestation with 14 "washout" between OPU sessions. Follicle...
The newly discovered Trio high-fecundity allele produces multiple ovulations in cattle. This study evaluated (1) size and growth rates of follicles carriers during a synchronized follicular wave, induced by follicle aspiration; (2) follicle-stimulating hormone (FSH) patterns associated with the wave; (3) corpora lutea (CL) circulating progesterone; (4) intrafollicular estradiol concentrations prior to normal deviation. had mean dominant that were significantly smaller diameter volume than...