Search Results

You are looking at 1 - 2 of 2 items for

  • Author: B. Y. Tang x
  • All content x
Clear All Modify Search
Free access

N. R. Adams and B. Y. Tang

Summary. The amount of cervical mucus recovered from control ovariectomized ewes increased with increasing doses of oestradiol benzoate (OB), while the maximum Spinnbarkeit of mucus occurred at an intermediate dose of OB. Neither the amount nor the Spinnbarkeit of mucus varied with the dose of OB in ewes with permanent infertility caused by grazing oestrogenic pasture (clover-affected ewes). Furthermore, the increase in Spinnbarkeit of cervical mucus seen in normal ewes treated over a 3-day period with OB or with implants containing oestradiol did not occur in affected ewes. In control ewes treated repeatedly with OB, production of mucus declined within 5 days, but no change in secretion was detectable in clover-affected ewes. Therefore, neither the amount nor the duration of oestrogenic stimulation affected the cervical mucus in ewes with clover disease. Affected ewes produced more mucus than did controls in the absence of oestrogenic stimulation. It is concluded that the relatively normal volume of mucus in affected ewes treated with OB results largely from autonomous production. The Spinnbarkeit does not increase in these ewes because the ability of the cervix to respond to oestrogen is impaired.

Free access

N. R. Adams and B. Y. Tang

Summary. After 10 days pretreatment with 10 mg progesterone daily, ovariectomized ewes were injected i.m. with 12·5, 25, 50 or 100 μg oestradiol benzoate (OB) and cervical mucus was collected 16, 24, 32, 40 and 48 h later (Exp. 1), or were injected with 12μ5, 40 or 100 μg OB daily, and the mucus examined, for 9 days (Exp. 2). The Spinnbarkeit was affected by the dose of OB over 9 days, but at all doses it increased over the first 3 days of treatment (Exp. 2). The wet weight of the mucus, the amount and proportion of water, and therefore the degree of arborization, increased with the dose of OB but decreased after 3 days in Exp. 2. The amount of dry matter, protein or carbohydrate did not have any clear relationship to dose or duration of OB treatment.