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About Us

Welcome to the Visual Guides of Animal Reproduction

The Visual Guides of Animal Reproduction, originally known as The Drost Project, began as a collection of images compiled by Maarten Drost over a period of 30+ years as a theriogenologist on the faculties of the University of California Davis and the University of Florida, as well as Utrecht University in The Netherlands and Colorado State University during sabbatical leaves. The foundation for this image atlas was laid during his stint as a visiting professor to Cornell University during the 1972/73 academic year, with numerous slides provided from the teaching collections of Dr. Stephen J. Roberts and Dr. Kenneth McEntee. Most of the images subsequently accumulated were generously contributed by friends and colleagues, and permission for their inclusion in this on-line guide has been granted. The images are categorized and each is given a title and an annotation and the original source of the image is acknowledged and referenced.

The purpose of the Visual Guides of Animal Reproduction is to share these visual images with students and colleagues and other professionals around the globe. Initially the guide focused on bovine reproduction. Subsequently, we have added the guides for bubaline (water buffalo) reproduction, equine (horse) reproduction, ovine (sheep) reproduction, porcine (pig) reproduction, caprine (goat) reproduction, and canine (dog) reproduction. The Visual Guides will be expanded to include other species, including feline, avian, and camelid guides. Pictures documenting unique conditions and cases contributed by theriogenologists from around the world are included.

Personal teaching slides are generally lost when educators switch to other pursuits or retire. Even when left to designated successors, images are of limited use unless they are annotated and catalogued and made available. In time we hope that continuing to combine individual collections will result in a broad, global educational resource. With the extensive globalization of education it is our goal to provide a tool to pass information from educators to practitioners and from practitioners to farm personnel.


Maarten Drost, DVM (ISU '62) Dipl ACT. Project Director

The Visual Guides began as a collection of images compiled by Dr. Maarten Drost over a period of 30+ years as a Theriogenologist on the faculties of the University of California Davis and the University of Florida, as well as Utrecht University in The Netherlands and Colorado State University during sabbatical leaves. The foundation for this image atlas was laid during his stint as a visiting professor to Cornell University during the 1972/73 academic year, with numerous slides provided from the teaching collections of Dr. Stephen J. Roberts and Dr. Kenneth McEntee. Images subsequently added have been generously contributed by friends, colleagues, and users of the Visual Guides. The images are categorized by subject and topic, and each is given a title and a caption, and the original source of the image is acknowledged and referenced.

Dr. Maarten Drost is the Director of the Project and acts as Chief Editor and Ambassador. He oversees the Project and has final say on content and future direction of the Visual Guides. He also presents the Project at academic and professional meetings and associations.

He is a founding father of the College of Veterinary Medicine at the University of Florida, which graduated its first class in 1980. Dr. Maarten Drost started the Department of Reproduction at that time, hired five species specialists and developed the curriculum in Theriogenology.

In addition, Dr. Maarten Drost has taught reproductive management courses in the Department of Animal Sciences of the College of Agriculture at the University of Florida since 1978. His research has focused on the initiation of parturition in ruminants, and on embryo transfer in cattle and in water buffalo.

Dr. Maarten Drost has a global reputation and has lectured and taught workshops on obstetrical management and reproductive technology in many countries around the world, including Argentina, Belize, Brazil, Bulgaria, Canada, Chile, Cuba, England, Egypt, Hungary, Ireland, Italy, Indonesia, Mexico, Mongolia, Netherlands, Poland, Sweden, and Venezuela.


Juan Samper, DVM and PhD, Dipl. ACT, Adjunct Project Director

Upon graduating from the College of Veterinary Medicine at the National University in Colombia. Dr. Samper worked in private dairy and equine practice for a couple of years in his home country and subsequently he earned his Master’s and PhD at the University of Minnesota which focused on reproductive physiology and clinical reproduction. He then became a board-certified specialist in Theriogenology. From there he accepted a faculty position at the University of Guelph in Ontario, Canada. Three years later he joined a mixed practice in Vancouver BC as an associate, and a year and a half later he started his own practice, as a solo practitioner, which later grew into a multi-vet practice, which he sold after 25 years. He then worked for a few years as an associate professor at Kansas State University, and in industry with Sexing Technologies. After his KSU experience, he joined the faculty at Ross University School of Veterinary Medicine where he worked as an associate dean for clinical affairs and professional opportunities at mentoring and monitoring the progress of the clinical year veterinary students in the 33 clinical affiliates around the world. Currently, Dr. Samper is a clinical professor and serves as the associate dean for academic and student affairs at the College of Veterinary Medicine at the University of Florida.


Patrick M. Larkin, PhD, (UF '00), Technical Administrator

Upon completing his PhD in the Interdisciplinary Program of Biomedical Sciences at the University of Florida, Dr. Larkin, co-founded a Biotechnology company in Alachua, Florida that specialized in developing molecular diagnostics in the aquatic toxicology field. After directing the scientific operations for several years and successfully bring several products to market, the company was bought out by a larger company, which is currently the industry leader in fish species identification in the country. In 2011, Dr. Larkin joined the faculty as an Adjunct Professor in the Large Animal Clinical Sciences Department at the University of Florida College of Veterinary Medicine. In that position, he developed an online teaching program geared towards undergraduate students interested in veterinary medicine. He currently serves as the Director of this online teaching program.


Deborah Gwen Cornwell, PhD (UF '89)

Dr. Gwen Cornwell was the original Technical Administrator for The Drost Project and was responsible for the technical development and management of the Project databases, software, publications, Visual Guides, and computer services.

She received her Doctorate in Reproductive Physiology (beef cattle) from the Department of Animal Sciences at the University of Florida.

The Drost Project Visual Guides were initially designed to be modular from the onset. The image, annotation, and reference information was collected and compiled in a custom designed PC based program (Visual Guide Developer). Once the information was entered (at a particular point in time, since a Visual Guide is never, in reality, complete) the Visual Guide Developer was used to generate a complete and functional Guide that works in concert with the familiar circular (Flash) menu on the left of each Visual Guide.