Jose Len

Jose Len

Associate Professor of Theriogenology

Department of Veterinary Clinical Sciences

LSU School of Veterinary Medicine
Louisiana State University
Baton Rouge, LA 70803



PhD, LSU, 2016

MS, LSU, 2008

Medico Veterinario Zootecnista (MVZ), Universidad de Guadalajara, 1996


Diplomate, American College of Theriogenology

Research Interest

In vitro embryo production in equine and canine species

Teaching Interest

Development of lifelong learning veterinarians

Clinical Interest

Mare and stallion infertility and gametes cryopreservation

Selected Publications

Sucrose and bovine serum albumin in association with dimethylformamide improved sperm parameters of frozen stallion semen. Madeline Kurpita and Jose Len. Clinical Theriogenology (2022). Vol. 14; 4 pp: 356 – 361.

Stallion Sperm Integrity After Centrifugation to Reduce Seminal Plasma Concentration and Cool Storage for 4 days. J. Len, D. Beehan, B. Eilts, E. Ebrahimie and S. Lyle. J Equine Vet Sci 2020 Vol. 85 Pages 102819. Accession Number: 31952647 DOI: 10.1016/j.jevs.2019.102819. 

The Phosphodiesterase Inhibitor, Isobutyl-1-Methylxanthine Prevents the Sudden Drop in Cyclic Adenosine Monophosphate Concentration and Modulates Glucose Metabolism of Equine Cumulus-Oocyte Complexes Matured in Vitro. M. Tscharke, K. Kind, J. Kelly, D. Kleemann and J. Len. J Equine Vet Sci 2020 Vol. 91 Pages 103112. Accession Number: 32684257 DOI: 0.1016/j.jevs.2020.103112. 

Sperm quality during extra-gonadal sperm reserve depletion in stallions. J. A. Len, D. Beehan, B. Eilts and S. K. Lyle. Reprod Domest Anim 2019 Vol. 54 Issue 2 Pages 412-414. Accession Number: 30315666 DOI: 10.1111/rda.13359 

Sex of co-twin affects the in vitro developmental competence of oocytes derived from 6- to 8-week-old lambs. J. M. Kelly, D. O. Kleemann, H. McGrice, J. A. Len, K. L. Kind, W. van Wettere and S. K. Walker. Reprod Fertil Dev 2017 Vol. 29 Issue 7 Pages 1379-1383. Accession Number: 27251060 DOI: 10.1071/RD16098 

Cushioned versus noncushioned centrifugation: sperm recovery rate and integrity. J. A. Len, D. P. Beehan, S. K. Lyle and B. E. Eilts. Theriogenology 2013 Vol. 80 Issue 6 Pages 648-53. Accession Number: 23849256 DOI: 10.1016/j.theriogenology.2013.06.009 

Effects of cooling time on membrane integrity and motility of frozen-thawed canine spermatozoa using two different commercial egg yolk-based extenders at two different cooldown equilibration times. S. du Bois, J. A. Len, J. M. Parlevliet and B. E. Eilts. Reprod Domest Anim 2012 Vol. 47 Suppl 6 Pages 278-80. Accession Number: 23279518 DOI: 10.1111/rda.12018 

Immediate and delayed (after cooling) effects of centrifugation on equine sperm. J. A. Len, J. A. Jenkins, B. E. Eilts, D. L. Paccamonti, S. K. Lyle and G. Hosgood. Theriogenology 2010 Vol. 73 Issue 2 Pages 225-31. Accession Number: 19913898 DOI: 10.1016/j.theriogenology.2009.09.003. 

Grant Funding

American Kennel Club. CHF Grant No. 03079-E $100,000. 2023 Small Animal Theriogenology Residency