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).
- M.S. in Animal Science, University of Missouri - (Columbia, Missouri, United States)
- B.S. in Animal Science, Texas A&M University - (College Station, Texas, United States)
- Ph.D. in Animal Science, minor in College Teaching in Ag, University of Missouri - (Columbia, Missouri, United States)
- Oosthuizen, N., Cooke, R. F., Schubach, K. M., Fontes, P., Brandão, A. P., Oliveira Filho, R. V., ... Lamb, G. C. (2021). Effects of estrous expression and intensity of behavioral estrous symptoms on variables associated with fertility in beef cows treated for fixed-time artificial insemination.. Anim Reprod Sci. 214, 106308-106308.
- Reese, S. T., Franco, G. A., Filho, R., Cooke, R. F., Smith, M. F., & Pohler, K. G. (2021). Technical note: Coccygeal vein catheterization for sampling of reproductive tract derived products from the uterine-ovarian drainage. JOURNAL OF ANIMAL SCIENCE. 99(2), skab025.
- Oliveira Filho, R. V., Cooke, R. F., de Mello, G. A., Pereira, V. M., Vasconcelos, J., & Pohler, K. G. (2020). 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.. JOURNAL OF ANIMAL SCIENCE. 98(7),
- Northup, S. L., Coffman, E. A., Strickland, L. G., Pohler, K. G., Daniel, J. A., & Whitlock, B. K. (2020). Intravenous infusion of kisspeptin increased serum luteinizing hormone acutely and decreased serum follicle stimulating hormone chronically in prepubertal bull calves.. Theriogenology. 144, 1-7.
- Stewart, J. L., Stella, S., Cunha, L. L., Dias, N. W., Canisso, I. F., Mercadante, V., ... Lima, F. S. (2020). Administration of nerve growth factor-β to heifers with a pre-ovulatory follicle enhanced luteal formation and function and promoted LH release. Theriogenology. 148, 37-47.
- Nash, J. M., Mallory, D. A., Selby, C. C., Pohler, K. G., Ellersieck, M. R., Smith, M. F., & Patterson, D. J. (2010). Comparison of long-term progestin-based protocols to synchronize estrus in postpartum beef cows. J Dairy Sci. 93, 766-766.