Indications for estrus induction in the bitch include missed breeding opportunities or conception failure, the treatment of primary or secondary anestrus and synchronization of ovulation for embryo transfer programs. Reported methods for canine estrus induction include the use of synthetic estrogens (diethylstilbesterol), dopamine agonists (bromocryptine and cabergoline), GnRH agonists (lutreli...

An adrenocortical tumor originating in a female Osborne-Mendel rat was trans planted to intact and adrenalectomized males and to female rats of the same strain. The transplanted tumor grew best in intact males, less in intact females, and least in adrenalectomized males. The following changes characterized the animals bearing this tumor: atrophy of zona fasciculate and zona reticularis of the a...

Introduction Profitability in the swine industry is based on prolificacy. One measurement of prolificacy is the number of piglets produced per year. To optimize prolificacy and profits it is essential that sows are re-bred as soon as possible after weaning. An extended post-weaning anestrus decreases overall productivity and increases costs of production. A large number of sows undergo prolonge...

A study was conducted to determine whether treatment with deslorelin, a gonadotropin-releasing hormone (GnRH) analog, produced anestrus in gilts and to test the ability of exogenous gonadotropin treatment with a combination of 400 IU equine chorionic gonadotropin and 200 IU human chorionic gonadotropin to induce estrus in GnRH analog-treated gilts. Twelve days after the third estrus, 11 gilts e...