# positions[].organizations[].parent[].label
College of Agriculture and Life Sciences

# overview
Dr. Pohler's research interest focus on understanding the physiological and molecular mechanisms that control reproductive efficiency in cattle. More specifically his lab is interested in the mechanisms that lead to embryonic and fetal mortality in cattle and development of management strategies to overcome these losses. Embryonic mortality can be classified into early (< d 28 of gestation) or late (> d 28 of gestation) depending on the exact timing at which it occurs during gestation. Reports of high fertilization rates after a single insemination (~90%), followed by pregnancy rates of 60 to 70% on d 28 in cows indicate that early embryonic mortality may be 20 to 30% in beef cows. Documented causes of early embryonic mortality range from genetic abnormalities to uterine-embryo asynchrony to failure of maternal recognition of pregnancy and this has been an area of intense investigation.  Late embryonic mortality (> d 28 of gestation) has been reported in both beef/dairy cattle and may vary from 3.2 to 42.7%.  Currently, there is very little known about the causes of late embryonic mortality. However, the economic consequences of each unit of late embryonic mortality are greater than that of early mortality. Along with the increased economic consequences, late embryonic mortality is becoming more evident in both the beef and dairy industries based on the shift to early pregnancy diagnosis (~d28-35 of gestation).

# keywords[]
30 Agricultural, Veterinary And Food Sciences

# keywords[]
30 Agricultural, Veterinary And Food Sciences

# keywords[]
Reproductive Tract Size And Position Score

# educationAndTraining[].organization.label
University of Missouri - (Columbia, Missouri, United States)

# educationAndTraining[].organization.label
Texas A&M University - (College Station, Texas, United States)

# educationAndTraining[].organization.label
University of Missouri - (Columbia, Missouri, United States)

# educationAndTraining[].field
Animal Science, minor in College Teaching in Ag

# awardsAndHonors[].label
Dugas Early Career Award for Research Excellence

# publications[].label
Intravenous infusion of kisspeptin increased serum luteinizing hormone acutely and decreased serum follicle stimulating hormone chronically in prepubertal bull calves.

# publications[].label
Reproductive programs for beef cattle: incorporating management and reproductive techniques for better fertility

# publications[].publisher
Colegio Brasileiro de Reproducao Animal - CBRA

# publications[].label
The ability to predict pregnancy loss in cattle with ELISAs that detect pregnancy associated glycoproteins is antibody dependent.

# publications[].label
Short communication: A reproductive tract scoring system to manage fertility in lactating dairy cows.

# publications[].label
Using pregnancy associated glycoproteins (PAG) for pregnancy detection at day 24 of gestation in beef cattle.

# publications[].label
Labeled extracellular vesicles can be found in the blood plasma shortly after intrauterine infusion in bovine

# publications[].label
Circulating concentrations of bovine pregnancy-associated glycoproteins and late embryonic mortality in lactating dairy herds.

# publications[].label
Effects of estrous expression and intensity of behavioral estrous symptoms on variables associated with fertility in beef cows treated for fixed-time artificial insemination.

# publications[].label
New approaches to diagnose and target reproductive failure in cattle.

# publications[].label
Markers of pregnancy: how early can we detect pregnancies in cattle using pregnancy-associated glycoproteins (PAGs) and microRNAs?

# publications[].publisher
Colegio Brasileiro de Reproducao Animal - CBRA

# publications[].label
Uterine and vaginal bacterial community diversity prior to artificial insemination between pregnant and nonpregnant postpartum cows1.

# publications[].label
Impacts of postweaning growth rate of replacement beef heifers on their reproductive development and productivity as primiparous cows1.

# publications[].label
Induced prostaglandin release alters steroid concentrations but not pregnancy survival in cows.

# publications[].label
Acute and subacute effects of a synthetic kisspeptin analog, C6, on serum concentrations of luteinizing hormone, follicle stimulating hormone, and testosterone in prepubertal bull calves.

# publications[].label
Pregnancy loss in beef cattle: A meta-analysis.

# publications[].label
Lowering rumen-degradable and rumen-undegradable protein improved amino acid metabolism and energy utilization in lactating dairy cows exposed to heat stress.

# publications[].label
Productive and physiological responses of feedlot cattle receiving different sources of Ca salts of fatty acids in the finishing diet.

# publications[].label
Circulating microRNA as candidates for early embryonic viability in cattle.

# publications[].label
Comparison of long-term progestin-based protocols to synchronize estrus in postpartum beef cows

# publications[].label
Use of bovine pregnancy-associated glycoproteins to predict late embryonic mortality in postpartum Nelore beef cows.

# publications[].label
Pregnancy associated glycoproteins (PAGs) and pregnancy loss in high vs sub fertility heifers.

# publications[].label
Pregnancy maintenance following sequential induced prostaglandin pulses in beef cows.

# publications[].label
Evaluating the use of luteal color Doppler ultrasonography and pregnancy-associated glycoproteins to diagnose pregnancy and predict pregnancy loss in Bos taurus beef replacement heifers.

# publications[].label
Cattle adapted to tropical and subtropical environments: genetic and reproductive considerations.

# publications[].label
Shifts in bacterial communities in the rumen, vagina, and uterus of beef heifers receiving different levels of concentrate.

# publications[].label
Bovine pregnancy associated glycoproteins can alter selected transcripts in bovine endometrial explants.

# publications[].label
Short communication: presynchronization for timed artificial insemination in grazing dairy cows by using progesterone for 14 days with or without prostaglandin F2 at the time of progesterone withdrawal.

# publications[].label
Circulating bovine pregnancy associated glycoproteins are associated with late embryonic/fetal survival but not ovulatory follicle size in suckled beef cows

# publications[].label
Is prolonged luteal phase a problem in lactating Holstein cows?

# publications[].label
Supplementing Ca salts of soybean oil after artificial insemination increases pregnancy success in Bos taurus beef cows.

# publications[].label
Vaginal and Uterine Bacterial Communities in Postpartum Lactating Cows.

# publications[].label
Pregnancy diagnosis in cattle using pregnancy associated glycoprotein concentration in circulation at day 24 of gestation.

# publications[].label
Sire contribution to pregnancy loss in different periods of embryonic and fetal development of beef cows.

# publications[].label
Colony-stimulating factor 2 acts from days 5 to 7 of development to modify programming of the bovine conceptus at day 86 of gestation.

# publications[].label
Predicting Embryo Presence and Viability.

# publications[].label
Impacts of estrus expression and intensity during a timed-AI protocol on variables associated with fertility and pregnancy success in Bos indicus-influenced beef cows.

# publications[].label
Impacts of administering prostaglandin F2 analogue 24 h prior to progesterone insert removal on expression of estrus in beef females

# publications[].label
Placental PAGs: gene origins, expression patterns, and use as markers of pregnancy.

# publications[].label
The effect of clitoral stimulation post artificial insemination on pregnancy rates of multiparous Bos indicus beef cows submitted to estradiol/progesterone-based estrus synchronization protocol.

# publications[].label
Reproduction in grazing dairy cows treated with 14-day controlled internal drug release for presynchronization before timed artificial insemination compared with artificial insemination after observed estrus.

# publications[].label
Circulating beta-hydroxybutyrate concentration may be a predictive measurement for young cows that have a greater probability to conceive at a fixed-time artificial insemination

# publications[].label
Plasma cell-free DNA concentration increases during luteolysis in beef cows.

# publications[].label
Genomic merit for reproductive traits. II: Physiological responses of Holstein heifers.

# publications[].label
Understanding placentation in ruminants: a review focusing on cows and sheep.

# publications[].label
Technical Note: Coccygeal vein catheterization for sampling of reproductive tract-derived products from the uterine-ovarian drainage.

# publications[].label
Association of concentrations of beta-carotene in plasma on pregnancy per artificial insemination and pregnancy loss in lactatingHolstein cows.

# publications[].label
Size and position of the reproductive tract impacts fertility outcomes and pregnancy losses in lactating dairy cows.

# publications[].label
Jugular-infused methionine, lysine and branched-chain amino acids does not improve milk production in Holstein cows experiencing heat stress.

# publications[].label
Administration of nerve growth factor- to heifers with a pre-ovulatory follicle enhanced luteal formation and function and promoted LH release.

# publications[].label
Estrous expression during a fixed-time artificial insemination protocol enhances development and interferon-tau messenger RNA expression in conceptuses from Bos indicus beef cows.

# publications[].label
Effects of rapid temperature fluctuations prior to breeding on reproductive efficiency in replacement gilts.

# publications[].label
The effect of subclinical endometritis on reproductive performance in postpartum Bos indicus multiparous beef cows.

# publications[].label
Impacts of learning experiences within an online extension initiative on application of research-based principles by beef stakeholders.

# publications[].label
Effect of progesterone concentrations, follicle diameter, timing of artificial insemination, and ovulatory stimulus on pregnancy rate to synchronized artificial insemination in postpubertal Nellore heifers.

# publications[].label
Progesterone dose during synchronization treatment alters luteinizing hormone receptor and steroidogenic enzyme mRNA abundances in granulosa cells of Nellore heifers.

# publications[].label
Impact of fetal vs. maternal contributions of Bos indicus and Bos taurus genetics on embryonic and fetal development1.

# publications[].label
Supplementing calcium salts of soybean oil to beef steers early in life to enhance carcass development and quality1.

# publications[].label
Effect of preovulatory follicle maturity on pregnancy establishment in cattle: the role of oocyte competence and the maternal environment

# publications[].publisher
Colegio Brasileiro de Reproducao Animal - CBRA

# publications[].label
Sire contribution to pregnancy loss and pregnancy-associated glycoprotein production in Nelore cows.

# publications[].label
Bacterial taxonomic composition of the postpartum cow uterus and vagina prior to artificial insemination1.

# researcherOn[].label
Reproductive Performance in Domestic Ruminants

# researcherOn[].awardedBy.label
National Institute of Food and Agriculture - (Washington D.C., District of Columbia, United States)

# researcherOn[].label
Mechanisms Associated with Late Embryonic Mortality in Cattle

# researcherOn[].awardedBy.label
United States Department of Agriculture - (Washington D.C., District of Columbia, United States)

# researcherOn[].awardedBy.preferredLabel
USDA-National Institute of Food And Agriculture

# researcherOn[].label
Physiological Function Of Prostaglandins And Pregnancy Associated Glycoproteins In Late Embryonic Mortality In Cattle

# researcherOn[].awardedBy.label
National Institute of Food and Agriculture - (Washington D.C., District of Columbia, United States)

# researcherOn[].awardedBy.label
United States Department of Agriculture - (Washington D.C., District of Columbia, United States)

# streetAddress
Texas A&M University; Animal Science; 2471 TAMU

# organizations[]
College of Agriculture and Life Sciences

# schools[]
College of Agriculture and Life Sciences

# inTheNews[].label
Beef cattle production focus of upcoming webinars

# inTheNews[].label
Texas A&M AgriLife establishes rural veterinarian network

# inTheNews[].label
Live demonstrations highlight Texas A&M beef short course