Technologies such as [[Reproductive Technologies -Artificial Insemination - Anatomy & Physiology|artificial insemination]](AI) have been in use for some time and in cattle, for example have become standard practice for reproduction purposes; the technique requires collection of [[Reproductive Technologies -Semen Collection - Anatomy & Physiology|semen]] from the male, which is preserved, tansported and introduced into the female reporoductive tract in synchrony with the ovulation cycle. Recently other techniques have been developed which permit development of the embryo in a donor animal - a technique called [[Reproductive Technologies -Multiple Ovulation and Embryo Transfer- Anatomy & Physiology|embryo transfer]]. This technique has some unique advantages and is becoming popular in some equine studs.