Tremendous changes in reproductive biotechnologies of animals and humans have occurred during the past 50 years, more than occurred in the previous millenium. The book is prefaced with a short chapter emphasizing what qualities the author believes a person should cultivate in the pursuit of knowledge, and the love of sharing it with others. The following chapters describe advances in understanding reproductive physiology of cattle, horses, swine, sheep, goats, rabbits, dogs and ferrets through the research started by Professor Glenn Salisbury in 1939, and continued by others at Cornell University through 1998. Studies included research on sexual behavior in males and females, spermatogenesis and oogenesis, sperm and oocyte preservation, artificial insemination, embryo culture and cloning. Finally, and importantly is a reminder that all researchers have a great responsibility to combine high ethical, moral and research standards in the pursuit of truth. Abstracts of and references to 489 papers published from 1939 to 1998 are included. Compressed versions of the book with search indexes that can be downloaded and expanded on your personal computer are also provided.