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George Seidel



Office: W129 ARBL Building, Foothills Campus
Phone: 970-491-5287
Fax: 970-491-3557

George E. Seidel, Jr., PhD

​University Distinguished Professor, Department of Biomedical Sciences
Animal Reproduction and Biotechnology Laboratory
Colorado State University
Fort Collins, CO 80523-1683


PhD, Cornell University
MS, Cornell University
BS, Pennsylvania State University

Teaching Activities

I have been teaching parts of the graduate course, Reproductive Physiology and Endocrinology (BMS 640), and a companion laboratory course, Research Techniques for Gametes and Embryos (BMS 642). However, I retired on September 30, 2011, and although I have been rehired on a part-time basis, my teaching now will be limited to occasional guest lectures, and my active involvement in research will decrease as well. I no longer take new graduate and postdoctoral students as major advisor.

Research Interests -- Reproductive Physiology

My main focus is on in vitro fertilization and culture of mammalian embryos, including the related areas of oocyte maturation, micromanipulation, and cryopreservation of embryos and oocytes. Most of this research is with cattle and horses. We have found that oxidizing NADPH with phenazine ethosulfate decreases lipid droplets markedly in in vitro-produced bovine embryos. We have also found that fructose is superior to glucose for culturing bovine embryos in vitro.

Sperm capacitation treatments in horses and various in vitro fertilization media also are of interest. Zona-free and zona-intact bovine oocytes have been used as a model for studying capacitation of equine sperm. We have determined that capacitation of equine sperm occurs more readily when polyvinyl alcohol rather than serum albumin is the macromolecule in the fertilization medium.

Recent research includes how bovine oocytes regulate mRNA. We have found that it is possible to inject radiolabeled RNA constructs into oocytes and successfully recover modified versions of the same construct some hours later. Another project concerns the role of microRNAs in oocyte maturation.

We continue to do research on improving the process of sexing sperm, particularly in keeping sperm healthy between semen collection and actual sexing. We also do considerable experimentation on practical methods of synchronizing ovulation of fertile bovine oocytes using cattle on a number of cooperating and University ranches.

Our research on cryopreservation of oocytes and embryos, both conventionally and via vitrification, is aimed at simplifying procedures without decreasing rates of survival. We also have developed systems for cryopreservation that have no components of animal origin, such as serum albumin, in order to decrease chances of spreading viral diseases.

Representative Publications

For a complete publication list, please visit: GE Seidel PubMed

Barcelo-Fimbres M, Campos-Chillon LF, Seidel GE Jr. 2011. In vitro fertilization using nonsexed and sexed bovine sperm: Sperm concentration, sorter pressure, and bull effects. Reprod Dom Anim 46:495-502.

Seidel GE Jr. 2010. Brief introduction to whole genome selection in cattle using single nucleotide polymorphisms. Reprod Fertil Dev 22:138-144.

Purcell SH, Cantlon JD, Wright CD, Henkes LE, Seidel GE Jr, Anthony RV. 2009. The involvement of proline-rich 15 in early conceptus development in sheep. Biol Reprod 81:1112-1121.

Schenk JL, Cran DG, Everett RW, Seidel GE Jr. 2009. Pregnancy rates in heifers and cows with cryopreserved sexed sperm: Effects of sperm numbers per inseminate, sorting pressure and sperm storage before sorting. Theriogenology 71:717-728.

Mazur P, Leibo SP, Seidel GE Jr. 2008. Cryopreservation of the germplasm of animals used in biological and medical research: Importance, impact, status, and future directions. Biol Reprod 72:2-12.

Seidel G.E Jr, Schenk JL. 2008. Pregnancy rates in cattle with cryopreserved sexed sperm: Effects of sperm numbers per inseminate and site of sperm deposition. Anim Reprod Sci 105:129-138.

Chapman PL, Seidel GE Jr. 2008. Experimental design, power, and sample size for animal reproduction experiments. Reprod Fertil Dev 20:33-44.

Barcelo-Fimbres M, Seidel GE Jr. 2007. Effects of either glucose or fructose and metabolic regulators on bovine embryonic development and lipid accumulation in vitro. Molec Reprod Develop 74:-1406-1418.

Checura CM, Seidel GE Jr. 2007. Effects of molecules in solutions for vitrification of mature bovine oocytes. Theriogenology 67:919-930.

De La Torre-Sanchez JF, Gardner DK, Preis K, Gibbons J, Seidel GE Jr. 2006. Metabolic regulation of in vitro-produced bovine embryos II. Effects of phenazine ethosulfate, sodium azide, and 2,4-dinitrophenol during post-compaction development. Reprod Fertil Develop 18:597-607.

De La Torre-Sanchez JF, Preis K, Seidel GE Jr. 2006. Metabolic regulators of in vitro-produced bovine embryos I. Effects of metabolic regulators at different glucose concentrations with embryos produced by semen from different bulls. Reprod Fertil Develop 18:585-596.

Preis KA, Seidel GE Jr, Gardner DK. 2007. Reduced oxygen concentration improves the developmental competence of mouse oocytes following in vitro maturation. Molec Reprod Develop 74:893-903.

Eldridge-Panuska WD, Caracciolo di Brienza V, Seidel GE Jr, Squires EL, Carnevale EM. 2005. Establishment of pregnancies after serial dilution or direct transfer by vitrified equine embryos. Theriogenology 63:1308-1319.

Tubman LM, Brink Z, Suh TK, Seidel GE Jr. 2004. Characteristics of calves produced with sperm sexed by flow cytometry/cell sorting. J Anim Sci 82:1029-1036.

Glover MD, Seidel GE Jr. 2003. Increased messenger RNA for allograft inflammatory factor-1, LERK-5, and a novel gene in 17.5-day relative to 15.5-day bovine embryos. Biol Reprod 69:1002-1012.

Seidel GE Jr, Garner DL. 2002. Current status of sexing mammalian spermatozoa. Reproduction 124:733-743.

Seidel GE Jr. 2001. Cloning, transgenesis and genetic variance in animals. Cloning and Stem Cells 4:251-256.

Seidel GE Jr. 2000. Reproductive biotechnology and the "big" biological questions. Theriogenology 53:187-194.

Olson SE, Seidel GE Jr. 2000. Culture of in vitro-produced bovine embryos with vitamin E improves development in vitro and after transfer to recipients. Biol Reprod 62:248-252.

Seidel GE Jr, Schenk JL, Herickhoff LA, Doyle SP, Brink Z, Green RD, Cran DG. 1999. Insemination of heifers with sexed sperm. Theriogenology 52:1407-1420.

Amann RP, Seidel GE Jr, Brink Z. 1999. Exposure of thawed frozen bull sperm to a synthetic peptide before artificial insemination increases fertility. J Androl 20:42-46.

Keller ML, Roberts AJ, Seidel GE Jr. 1998. Characterization of insulin-like growth factor-binding proteins in the uterus and conceptus during early conceptus elongation in cattle. Biol Reprod 59:632-642.

Romero-Arredondo A, Seidel GE Jr. 1996. Effects of follicular fluid during in vitro maturation of bovine oocytes on in vitro fertilization and early embryonic development. Biol Reprod 55:1012-1016.

Bowen RA, Reed ML, Schnieke A, Seidel GE Jr, Stacey A, Thomas WK, Kajikawa O. 1994. Transgenic cattle from biopsied embryos. Biol Reprod 50:664-668.

Ivani KA, Seidel GE Jr. 1991. A least half of capacitated, motile mouse sperm can fertilize zona-free mouse oocytes. J Exp Zool 260:406-412.

Wheeler MB, Seidel GE Jr. 1989. Capacitation of bovine spermatozoa by lysophospholipids and trypsin. Gamete Res 21:193-204.

Williams TJ, Elsden RP, Seidel GE Jr. 1984. Pregnancy rate with bisected bovine embryos. Theriogenology 22:521-531.

Seidel GE Jr. 1981. Superovulation and embryo transfer in cattle. Science 211:351-358.