Horse Breeding FOAL=A young, unweaned horse of either sex COLT=A male horse up to three years of age DAM=Female parent of the horse ARTIFICALINSEMINATION=Introducing sperm into the female tract by nonnatural means JENNET=Female donkey; also called jenny MAIDENMARE=Female horse that has not been bred or produced a foal GESTATION=The period in which a female horse is pregnant GELDING=A castrated male horse MARE=Female horse over the age of three SIRE=Male parent of the horse STALLION=Male horse over four years of age COLOSTRUM=First milk secreted by the mare per foaling; high in antibodies ESTRUS=Period of sexual excitement during which the female will accept the male in the act of mating JACK=Male donkey FLUSHING=The process of removing the embryo from a mare in preparation for transfer EMBRYOTRANSFER=Removal of developing embryos from one mare and their transfer to the uterus of another DYSTOCIA=A difficult birth in a mare