Clinico-endocrinological, biochemical and histopathological analyses on ovarian cyst in cow.

概要

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Physiopathological condition of ovarian cyst in cow was analysed by clinico-endocrinological, biochemical and histopathological investigations, and following results were obtained. (1)It was demonstrated by ultrasonographic observation that ovarian cyst(s) degenerated, never being persistent, and newly growing follicle(s) developed to new ovarian cyst(s) without ovulation, showing periodic vicissitudes with about 21 days cycle. (2)Some cows with ovarian cyst manifested the standing estrus at the time when the follicle(s) grew and developed to cyst(s). (3)Although blood progesterone level offered in low and estradiol-17β level increased to high during the stage where the cyst(s) degenerated and follicle(s) developed to new cyst(s), luteinizing hormone (LH) surge never occurred. (4)As to the no arise of LH surge, functional abnormality of the hypothalamic cyclic center was suspected. (5)The cow with ovarian cyst was considered to be chronic disturbance of the liver function and in oxidative stress, and such abnormalities might be related to the occurrence of ovarian cyst by obstructing the LH surge. (6)Remarkable degenerative changes occurred in granulosa cells of ovarian cyst reached maximum size. Detachment and fall of the granulosa cells took place and theca folliculi (theca interna and externa) became thin at the degenerating stage of the cyst.
日本家畜臨床学会の論文