A.S. Series 68-33
For years scientists have been trying to find drugs or hormones that will control the reproductive cycle and bring gilts into estrus together to be bred at the same time. The only compound tested to date which has been successful in achieving this goal without also producing undesirable side effects is one called by the tradename Aimax. During a normal estrous cycle, gonadotropic hormones are released from the pituitary gland and are carried by the blood to the ovary where these hormones stimulate the production of estrogen by the ovary and cause ovulation. When Aimax is fed to female swine, it prevents the release of gonadotropic hormones from the pituitary gland. Without stimulation from gonadotropic hormones, ovulation does not occur and the ovary does not produce the estrogen needed to bring sows and gilts into estrus. Thus, Aimax fed to sows or gilts prevents them from ovulating or coming into estrus. Most females will then exhibit estrus accompanied by ovulation five to seven days following withdrawal of Aimax from the feed. With the increasing interest among South Dakota Swine Producers in estrus synchronization and artificial insemination, this study was made to compare these techniques with unsynchronization and natural service under practical farm conditions in South Dakota.
Number of Pages
Agricultural Experiment Station, South Dakota State University
Shelby, D.R., "Estrus Synchronization and Artificial Insemination of Swine" (1968). South Dakota Swine Field Day Proceedings and Research Reports, 1968. 8.