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  • Title: [The occurrence of different forms of ovarian cysts in swine with special reference to their effect on the estrus cycle].
    Author: Schnurrbusch U, Scharfe S.
    Journal: Tierarztl Prax; 1991 Dec; 19(6):635-43. PubMed ID: 1796466.
    Abstract:
    Ovaries of 100 sows with ovarian cysts were collected at the slaughterhouse after normal slaughter. The ovarian function was assessed macroscopically and representative sections of 55 ovaries were examined histologically. The cysts were grouped into the following categories: follicle theca cysts, follicle lutein cysts, lutein cysts, blood cysts and mixed forms with concurrent incidence of the above cyst forms. Only follicle theca cysts, follicle lutein cysts, lutein cysts or blood cysts were found in 24%, 7%, 32% and 10% of animals, respectively. In 27% of animals the above mentioned forms of cysts occurred concurrently. A large number of cysts per animal was found for follicle theca cysts (9.0 cysts per animal) and mixed forms (11.0 cysts per animal). Follicle lutein cysts, lutein cysts and blood cysts were developed in smaller numbers (3.1, 3.9 and 4.8 cysts per animal, respectively). Anestrus occurred only for follicle theca cysts, if their number exceeded 7 cysts per animal (13 per cent of the examined animals). Blood cysts occurred only during the metoestrus and follicle lutein and lutein cysts only during the corpus luteum phase. It is assumed that the cysts regress after the 13th day of the cycle, if normal corpora lutea are present at the same time. Only follicle theca cysts occurring in large numbers persist and block subsequent cyclic activity. There seems to be a particular predisposition for the development of cysts when the ovarian cycle is re-initiated after anestrus.
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