Breeding wine, (noun); is a gorean sweet beverage which counteracts the effects of slave wine, making a slavegirl fertile; also called second wine.
In the concentrated state, as in slave wine, developed by the caste of physicians, the effect is almost indefinite, usually requiring a releaser for its remission, usually administered to a slave in which is called the breeding wine, or the "second wine." When this is administered she usually knows that she has been selected for crossing with a handsome male slave.
Book 18, Blood Brothers of Gor: Page 319
The active ingredient in the breeding wine, or the "second wine," is a derivative of teslik.
Book 18, Blood Brothers of Gor: Page 320