A5078633492- Reproductive Physiology in Livestock
- Genetic and phenotypic traits in livestock
- Reproductive Biology and Fertility
- Effects of Environmental Stressors on Livestock
- Animal Disease Management and Epidemiology
- Animal health and immunology
- Reproductive System and Pregnancy
- Vector-Borne Animal Diseases
- Animal Behavior and Welfare Studies
- Livestock Management and Performance Improvement
- Pharmaceutical studies and practices
- Animal Virus Infections Studies
- Health, Environment, Cognitive Aging
- Helminth infection and control
- Birth, Development, and Health
- Viral gastroenteritis research and epidemiology
- Animal Nutrition and Health
- Safe Handling of Antineoplastic Drugs
- Ovarian function and disorders
- Virus-based gene therapy research
- Genetics, Aging, and Longevity in Model Organisms
- Microbial infections and disease research
- Stress Responses and Cortisol
- Pregnancy and preeclampsia studies
- T-cell and Retrovirus Studies
Texas A&M University
2018-2024
Mitchell Institute
2021-2023
South Dakota State University
2016-2021
Animals that exhibited estrus had greater pregnancy success compared to animals did not exhibit before fixed-time AI (FTAI). Estradiol is synthesized in bovine ovarian follicles under gonadotropin regulation and can directly indirectly regulate the uterine receptivity luteal function. concentrations at FTAI impacted oviductal gene expression has been reported play an important role establishing timing of receptivity. These changes have impact pH sperm transport site fertilization. After...
Transrectal ultrasonography is known as the gold standard for pregnancy detection, but requires costly equipment and technical skills; therefore, access to an inexpensive more user-friendly method with similar accuracy could benefit cattle producers. Detection of pregnancy-associated glycoproteins can accurately determine in ruminants; however, usually specialized assay. Thus, objectives these studies were 1) validate IDEXX Alertys OnFarm Pregnancy Test (lateral flow) compare all three...
Antral Follicle Count (AFC) and anti-Müllerian hormone (AMH) concentrations are reflective for ovarian reserve have been associated with improved reproductive performance in cattle. Key events regulation of uterine receptivity orchestrated by progesterone. As progesterone greater animals high than low AFC, we tested the hypothesis, if resulting environment will lead to conceptus elongation endometrial response interferon tau. For four years, 10 heifers lowest highest respectively, were...
Abstract Trace minerals are known to play important roles in early embryo development. The study objective was determine effects of trace mineral source on heifer reproductive performance. Beef heifers (n = 129) were randomly assigned one two treatments. From weaning through breeding, all individually fed a basal diet supplemented with cobalt (Co), copper (Cu), manganese (Mn), and zinc (Zn) either from organic sources (COMP; Cu, Mn, Zn amino acid complexes Co glucoheptonate; Availa-4, Zinpro...
Abstract Pregnancy detection is an extremely valuable practice in animal production systems as it allows for identification of pregnant or nonpregnant females and thus contributes to informed management decisions. Unfortunately, blood pregnancy tests simply provide a yes no answer status. Multiparous ewes (n = 20) at the Arkansas State University Teaching Research Center were enrolled study evaluate whether lamb number sex would impact commercial test results. Weekly samples collected, total...
Our objective was to evaluate the effect of vaccination with an inactivated virus vaccine (IVV) or modified-live (MLV) on corpus luteum (CL). On d0, synchronized beef cows were treated MLV (n = 70; BoviShield Gold FP5VL5), IVV 16; ViraShield 6VL5HB), unvaccinated controls 5). Plasma collected from animals d0 and every other day through d22. analyzed for concentrations progesterone 15 cytokines. Between d10 d13, selected females 13) ovariectomized; slaughtered d15/16 obtain CL histological...
Abstract Vaccines are known to impact both the immune and reproductive systems. The objective of this research was identify immunological cyclic differences following vaccination for Bovine Viral Diarrhea Virus (BVDV) and/or Infectious Rhinotracheitis (IBR). Brahman cows (n = 15) were administered PGF2α regress corpus lutea on d -3. Animals (d 0) immunized (2mL, intramuscular injection) with one three treatments: 1) Modified Live Vaccine (MLV) BVDV IBR (BVD+IBR; n 5), 2) MLV only (BVD; or 3)...
Abstract Controlled Internal Drug Release (CIDR) devices have become an important component of reproductive management programs in many beef herds. When a CIDR is inserted into cow, circulating concentrations progesterone mimic functional corpus luteum. Some data, however, suggest that concentration following insertion might negative consequences on fertility Bos indicus animals. Therefore, the objective this study was to determine impact device and uterine tissue progesterone. A blood...
Context Antral follicle count (AFC) is reflective of ovarian reserve and linked to reproductive performance in mammalian females. We previously demonstrated earlier upregulation endometrial oxytocin receptor transcription heifers with low AFC, indicating an onset luteolysis. Aims aimed support the luteolysis non-pregnant a number antral follicles (Open Low AFC) hypothesized reduced abundance luteinizing hormone/choriogonadotropin (LH/CG-R) increased thrombospondin-1 (THBS1) luteal tissue...
The primary objective of this study was to determine relationships cell-mediated immune response (CMIR) cows with postpartum interval (PPI; calving estrus), colostral immunoglobulins (IgG-1 and IgM), calf growth. Multiparous Brahman (n=49) were previously evaluated during gestation for CMIR. In brief, on d0 the subcutaneously inoculated in neck killed Candida albicans (0.5 mg) Quil A adjuvant (0.75 mg). On d14 had tail skinfold thickness measured received an injection (0.1 skinfold. d15 site...
Ovarian antral follicle count (AFC) has been associated with reproductive efficiency as the more fertile cattle have growing follicles than do less cattle. The purpose of this study was to correlate AFC at d 28 post-calving and 8 post-estrus postpartum interval (PPI) in Brahman cows. Ultrasonography (3D; GE Voluson I: Sono AVC) performed on cows (n=46) post-estrus. Follicles were counted measured determine number total follicles, small (≤17 mm3), medium (17 mm3 67 large (≥67 mm3) each ovary....
Abstract The relationships between cell-mediated immune response (CMIR) of cows and calving interval calf growth were evaluated. Calving was evaluated for each the initial 7 life-time opportunities that females had to produce a calf. number days from when cow until she calved again determined cow’s year. Spring breeding seasons divided into 45-d artificial insemination natural service periods. Fall season Multiparous Brahman (n = 435) records dates weaning weights. CMIR (hypersensitivity...
Abstract Pre-synchronization has been evaluated as a method to improve synchrony of ovulatory follicles before fixed-time AI (FTAI). The objective was compare FTAI results in beef cows from two protocols that utilize pre-synchronization. Blood samples were collected on d-14 (d0=CIDR removal) determine progesterone concentration at the start synchronization (P4start: ≥1ng/mL=high, < 1ng/mL=low). In subset (n=1,032), an additional blood sample taken between d-21 and -29 cyclicity. Cows...
Improved reproductive efficiency is critical for profitability in cow-calf operations. Cows that give birth early wean more pounds of calf and stay the herd longer. Thus objective this study was to determine impact implementing a fixed time AI protocol had defined 60-d breeding season, on calving distribution efficiency. Individual performance data (calving date, weight, weaning weight) were collected annually (yr 1 2 no technology used; yr 3, 4, 5 fixed-time n = 225 296 cows annually)....
Abstract The objective of this study was to determine if prenatal stress impacted semen characteristics during pubescent maturation Brahman bulls (n = 23). Prenatal achieved by transporting dams for 2 h on d 60, 80, 100, 120, and 140 (± 5 d) gestation. Semen from sexually maturing males born transported (PNS; n 11) or non-transported (CON; 12) classified based motility concentration as prepubertal (< 10% < 50 million), peripubertal (≥ ≥ pubertal mature 30% 500 million). Sperm...
Abstract This experiment aimed to compare synchronization cost associated with two protocols: one utilizing estrus detection (6d; PG 6-d CIDR+TAI) and strictly fixed-time artificial insemination (FTAI; 7d; 7-d CO-Synch+CIDR). Cows heifers (n = 657) from 10 herds in three states were grouped by days postpartum age, randomly assigned of protocols. the 6 d protocol administered prostaglandin F2α (PGF) on d-9, CIDR insertion administration gonadotropin-releasing hormone (GnRH1) -6, removal PGF...