New Facts Concerning the Afferent Stimuli that Trigger Ovulation by Coitus in the Rat

Aron, C; Roos, J; Asch, G

doi:10.1159/000121693

Cited by 11 publications

(1 citation statement)

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“…Mounting by the male when penile intromission was prevented was not as effective as a smaller number of mounts with intromissions. These findings are similar to those reported by Aron, Roos & Asch (1968) who used normal rats showing 4-day cycles but primed with oestrogen at metoestrus. Whether mounting had any specific effect on LH release is not clear since stressful procedures such as laparotomy under ether anaesthesia were about as effective in inducing ovulation as mounting.…”

Section: Discussionsupporting

confidence: 91%

Induced Ovulation in Albino Rats Exposed to Constant Light

Brown-Grant¹,

Davidson²,

Greig³

1973

Journal of Endocrinology

100

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Adult female albino rats were exposed to constant illumination of moderate intensity for 55\p=n-\65 days; at the end of this period more than 95 % had no macroscopically visible luteal tissue in their ovaries and more than 90 % were sexually receptive. In these animals ovulation was consistently induced by mating. The major component of the mating pattern responsible for the induction of ovulation was penile intromission. Mounting without intromission was much less effective and the occurrence or non-occurrence of ejaculation did not affect the incidence of ovulation. Non-sexual 'stressful' stimuli or the injection of progesterone also induced ovulation in about 50% of animals. However, adrenal progesterone was not required for either the maintenance of sexual receptivity or mating-induced ovulation since adrenalectomized rats exposed to constant light also mated and ovulated.The time-course of the secretion of luteinizing hormone (LH), determined by radioimmunoassay of plasma LH, also indicated that mating had effects on LH secretion independent of any action of progesterone. LH concentrations were high at 40 min and maximal at 60 min after mating but decreased thereafter while following the injection of progesterone the levels rose gradually and remained high until at least 360 min after the injection. Sodium pentobarbitone administration had little effect on LH secretion induced by mating but blocked ovulation in some animals. Mating-induced ovulation was not invariably associated with increased activity of the thyroid gland but an increase did occur when the mating stimulus was prolonged.

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Section: Discussionsupporting

confidence: 91%