The present invention relates to an animal ovarian function inactivating composition using lactic acid. The present invention enables that a composition selectively injected for ovarian inactivation does not cause any impairment in growth of the animals, and that the injected composition does not hinder the quality or safety of the meat due to the ovary inactivating composition, and the composition of the present invention comprises 10-90 wt% lactic acid and 10-90 wt% bulking agent. When the composition according to the present invention is topically injected into the ovary, since the function of the parenchymal tissues of the ovary is lost, an effect of suppressing estrus of an individual animal is obtained, thereby improving the growth rate of the individual animal and maintaining the appetite of the individual animal so that an increase in meat production can be promoted. Also, since the inactivation of the ovary is completed with only one microinjection, the lactic acid does not remain in vivo and in the meat. The present invention has advantageous effects in producing livestock products suitable for environment-friendly certification and in making the costs of inactivation very cheap, since a withdrawal period due to the injection of the ovary inactivating composition is not necessary and the composition does not cause an increase in the concentration of the lactic acid in the blood.La présente invention concerne une composition d'inactivation de la fonction l'ovaire animal utilisant de l'acide lactique. La présente invention permet qu'une composition, servant à l'inactivation de l'ovaire, sélectivement injectée ne provoque une quelconque dégradation du développement des animaux, et que la composition injectée n'empêche pas la qualité ni la sécurité de la viande en raison de la composition d'inactivation de l'ovaire, et ladite composition selon la présente invention comprend de 10 à 90 % en poids d'acide lactique et de 10 à 90 % en poids d'un agent gonflant. Lo
