J. J. Swarts

Publications18
h-index9
Citations238
Highly Influential Citations9
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Effect of hypothyroidism on the pituitary-gonadal axis in the adult female rat.
The pituitary-ovarian axis was studied after withdrawal of thyroid hormone in 131I-radiothyroidectomized adult female rats. Oestrous cycles became prolonged and irregular within 2 weeks after the… Expand
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Quantification and classification of pregnancy wastage in 5-day cyclic young through middle-aged rats
Fecundity was quantified in 4 to 11-month old rats with regular 5-day cycles. On the day following mating, less than 5% luteinized unruptured follicles occurred in either 4-month old or 11-month old… Expand
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Advancement of meiotic resumption in graafian follicles by LH in relation to preovulatory ageing of rat oocytes.
After ovulation, the fertile life of oocytes is short. In the present study, the fertile life of oocytes was studied in relation to the resumption of meiosis. Early on the day of pro-oestrus, meiotic… Expand
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Effect of CRH on the Preovulatory LH and FSH Surge in the Cyclic Rat: a Role for Arginine Vasopressin?
The effect of intracerebroventricular (i.c.v.) injection or infusion of various doses of corticotropin‐releasing hormone (CRH) on the LH and FSH surge was studied in pro‐oestrous rats supplied with a… Expand
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Advancement of meiotic resumption in graafian follicles reduces fertility in the rat.
Fertile life of oocytes is usually considered to be related to ovulation time. In the present study, fertile life of rat oocytes was studied in relation to resumption of meiosis. In pro-oestrus,… Expand
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The suckling-induced rise of plasma prolactin in lactating rats: its dependence on stage of lactation and litter size.
The response of plasma prolactin in vigorous suckling was measured in lactating rats which had been isolated for 10-12 h from their offspring. Plasma prolactin was investigated during suckling at… Expand
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Circadian variations in the plasma concentration of prolactin in the adult male rat.
The occurrence of circadian variations in the concentration of prolactin in the plasma of 6- to 9-month-old male rats has been assessed in animals exposed to light for 14 h/day (lights on… Expand
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Inhibition of the LH surge in cyclic rats by stress is not mediated by opioids.
The effects of intravenous (iv) administration of the opioid antagonists naloxone and naltrexone on the restraint-induced suppression of the pro-estrous LH surge were studied in cyclic female rats.… Expand
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A Signaling Role for Leptin in Puberty Onset in Female Rats?
The brain might initiate puberty in response to adequate leptin signaling from the periphery. We studied the link between whole body fat, plasma leptin levels, and puberty onset, in both controls and… Expand
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Intraperitoneal infusion of EDTA in the rat blocks completely the prolactin rise in the plasma during suckling.
Lactating rats supplied with chronically indwelling intravenous (i.v.) and intraperitoneal (i.p.) catheters were allowed to suckle after a night of isolation from their offspring. The effect of… Expand
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