PFG is used in the treatment of uterine infections, to cause abortions up to 100 days after breeding, expulsion of mummified fetus and for timing of breeding. Two PFG products, Lutaluze and Estrumate, are available. For instance, when a CL is present at the time PFG is given, the cow will usually come into heat within 2-5 days. If the PFG is given early in the estrous cycle before a CL is formed and functional, no induced heat will occur. There is a system known as Target Breeding in which PFG is use d to synchronize the breeding time.
Estrogens have effects on both the ovaries and the uterus.
They can correct anestrus in the absence of a follicular cyst. They are also recommended for treatment of a persistent CL, to empty the infected uterus and for the expulsion of a retain ed placenta or mummified fetus. ECP is an estrogen composed of estradiol cypionate. Estrogens have been known to cause cystic ovaries and can cause estrus to occur without ovulation. Oxytocin , often used to cause letdown of milk, also has the uterus as a target reproductive organ.