Regulation of estrus and ovulation in gilts
AssigneeThorn BioScience LLC
InventorPatrick J. Burns
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Abstract
Controlled release compositions and methods for inducing pseudopregnancy in gilts and sows are disclosed. In the preferred embodiment, the formulation includes polylactide microspheres releasing estradiol 17.beta. at physiologically useful levels over a period of time between five and thirty days. Following induction of pseudopregnancy, the pseudopregnancy can be terminated and estrus induced by administration of a compound such as PGF2.alpha.. The advantages of inducing pseudopregnancy followed by induction of estrus are that the breeding patterns of large numbers of gilts and sows can be controlled.
Claims24
A method for inducing pseudopregnancy in fertile female pigs comprising administering to the pigs an effective amount of a compound that induces pseudopregnancy in a biodegradable controlled release formulation.
A composition for inducing pseudopregnancy in a gilt or sow comprising a biodegradable controlled release formulation of a compound that induces pseudopregnancy in a gilt or sow.
A method for inducing pseudopregnancy in fertile female pigs comprising administering to the pigs an effective amount of a compound that induces pseudopregnancy in an implantable controlled release formulation, which can be removed from the pigs following release of the compound.
A device for inducing pseudopregnancy in a gilt or sow comprising an implantable controlled release formulation of a compound that induces pseudopregnancy, wherein the device can be removed from the pigs following release of the compound.
Dependencies are inferred from the claim text.