Lack of LH Response to Exogenous Estradiol in Heifers with ACTH-Induced Ovarian Follicular Cysts.
نویسندگان
چکیده
منابع مشابه
Lack of LH response to exogenous estradiol in heifers with ACTH-induced ovarian follicular cysts.
The aim of the present study was to examine the LH response to exogenous estradiol in 4 heifers with ACTH-induced ovarian follicular cysts. During the control experiment, administration of estradiol 24 hr after PGF2alpha in luteal phase heifers resulted in a LH response in all 4 heifers. The LH response was obtained between 16-20 hr after estradiol administration. The peak LH concentration (Mea...
متن کاملThe role of LH pulse frequency in ACTH-induced ovarian follicular cysts in heifers.
The aim of the present study was to induce ovarian cysts experimentally in cattle using ACTH and to closely examine the role of LH pulse frequency in ovarian cyst formation. Five regularly cycling Holstein-Friesian heifers (15-18-month-old) were used. Ovaries were scanned daily using an ultrasound scanner with a 7.5 MHz rectal transducer. Daily blood samples were obtained via tail venepuncture ...
متن کاملAdministration of progesterone to cows with ovarian follicular cysts results in a reduction in mean LH and LH pulse frequency and initiates ovulatory follicular growth.
Cows with ovarian follicular cysts were treated with progesterone to determine whether a reduction in LH concentrations and initiation of ovulatory follicular waves would occur. Cysts were diagnosed using transrectal ultrasonography when single follicular structures > 20 mm or multiple structures > 15 mm in diameter were present for 7 d in the presence of low progesterone concentrations. Three ...
متن کاملOvulation and Endocrine Response after Lh-rh in Domestic Animals
cows 2 weeks after parturition and in diestrous and proestrous heifers. Serum LH concentrations increased after LH-RH treatment and the greatest response was observed in cows with ovarian follicular cysts. Serum progesterone concentrations were increased at 6 hours after LH-RH in animals which had functional luteal tissue in the ovaries but serum estradiol and estrone were unchanged. Ovarian fo...
متن کاملFollicular ovarian cysts in stillbirths and neonates.
A review of the histology of 332 ovaries from stillbirths and neonatal deaths within the first 28 days of life showed that follicular cysts, lined by granulosa epithelium and having a diameter greater than 1 mm on a microscopical section, were present in 113 infants. In 48 cases multiple cysts were present, while in 65 only a single cyst satisfying the criteria was found. There was an excess nu...
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ژورنال
عنوان ژورنال: Journal of Veterinary Medical Science
سال: 1999
ISSN: 0916-7250,1347-7439
DOI: 10.1292/jvms.61.979