牛の子宮分泌液に関する研究

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  • Studies on the uterine secretion of the cow
  • IX.Interaction of estradiol and progesterone on the fructose and sorbitol formation in the uterus of ovariectomized cow
  • IX.卵巣摘出牛における子宮内フラクトースおよびソルビトールの消長に及ぼす卵巣ホルモンの影響

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Effects of estradiol and progesterone injection on the fructose and sorbitol formation in the uterus were investigated using seven Holstein cows (27 years of age) after ovariectomy.<BR>Hormonal treatment was initiated on day 30 after the operation.<BR>Injection of estradiol and progesterone, single or combined, was given intramuscularly (Exp. A) or into the uterine stroma (Exp. B), five times at 8 hr-intervals. A single dose contained 2 mg estradiol and 100200 mg progesterone in Exp. A and 2 μg estradiol and 5 mg progesterone in Exp. B.<BR>Uterine fluid was collected for 2 hr by cannulation through the cervix, and endometrial tissue was obtained with biopsy on day 3 and on day 7 after the initial injection. Antibiotics was deposited intrauterine cavity after the sampling.<BR>Fructose and sorbitol concentrations in the samples were estimated by gas-liquid chromatography using adonitol as an internal standard.<BR>On day 30 after ovariectomy, fructose and sorbitol were not detectable in the uterine fluid and the endometrial tissue of the cow. Estradiol injection did not stimulate fructose and sorbitol formation. On the contrary, progeste-rone showed a stimulating effect which was further enhanced in collaboration with estrogen.<BR>Increasing dose of progesterone to estradiol, appeared to enhance the synergistic actions of tLe two hormons.<BR>Histologically active reactions following the ovarian hormone treatments were found in the uterine surface epithelium of ovariectomized cows.

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