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Biomedical subjects

J Perraud

Publications and source records attributed to J Perraud.

12 recordsLinked to original sources
PubMed1987

Effects of tioconazole on parturition and serum levels of 17 beta-oestradiol, progesterone, LH and PRL in the rat.

Tioconazole, an imidazole antifungal agent, was administered orally at 100 mg/kg/day to pregnant rats according to two regimens; in one, treatment started on day 15 post-insemination (p.i.) and in the other it started on day 18 p.i. The first regimen caused a delay in onset of parturition and a prolongation of labour. Serum progesterone was decreased from days 17 to 21 p.i., 17 beta-oestradiol decreased on day 21 p.i., LH increased on day 17 p.i., and the normal surge of prolactin on day 21 p.i. abolished. The parturition disorders disappeared when 17 beta-oestradiol (0.125 microgram/animal/day s.c.) was given with tioconazole from day 15 p.i. In the second regimen, tioconazole treatment advanced by about 24 hours the onset of parturition and the normal fall in serum progesterone and the surge in prolactin. Serum 17 beta-oestradiol was unaffected, but LH was raised on days 19 and 20 p.i. In animals receiving progesterone (2.5 mg/animal/day, s.c.) and tioconazole from day 18 p.i. parturition was no longer advanced. In conclusion, the parturition disorders observed in rats during tioconazole treatment are associated with a modification of progesterone and 17 beta-oestradiol serum levels. These findings have questionable relevance for the human situation as the roles of these steroid hormones in parturition in women are different from those in rats.

Animals↗
PubMed1987

A method for the routine observation of sexual behaviour in rats.

In seeking a method for the routine observation of copulatory behaviour in rats we compared the use of a standard rectangular Makrolon cage, commonly used in toxicology studies, with a Plexiglas cylinder that provided 2.5 times more floor area. The cylinder resulted in a much higher incidence of copulation, either once or for multiple series, within 30 min. This was not affected by whether oestrus was natural or induced. Using the cylinder and 4 h observation periods, we found that the dark phase of a 12-12 h inverse light cycle resulted in many more copulations than occurred during the light phase of a natural cycle. The incidence increased from the first to the second to the last 4 h of the dark phase. We found that placing a virgin receptive female and a naive male together in a Plexiglas cylinder for 1 h towards the end of the dark phase is a useful tool in reproductive toxicology studies in which it is important to know the precise time of insemination.

Animals↗
PubMed1984

Reproductive studies with the anti-inflammatory agent, piroxicam: modification of classical protocols.

Reproductive toxicology studies were conducted in rabbits and rats given piroxicam, a non-steroidal anti-inflammatory agent (NSAI), orally at 2, 5 and 10 mg/kg/day. In teratology studies there was neither drug-related embryotoxicity nor teratogenicity. As piroxicam, like other NSAI, affects parturition in rats and leads to a progressive toxicity in lactating females, standard protocols were modified: dams of the female fertility study were treated from 2 weeks prior to mating until day 6 of gestation and females of the post-natal toxicity study were treated from parturition until day 12 of lactation. No other adverse effects on reproduction, fertility and postnatal development were observed.

Animals↗
PubMed1983

Use of the New Zealand white rabbit in teratology: incidence of spontaneous and drug-induced malformations.

Cumulative data are presented on the occurrence of external, skeletal and visceral abnormalities in foetuses from teratology studies conducted in New Zealand White rabbits over a 10-yr period. The data, based on examinations of over 5500 control foetuses and 19,000 foetuses from treated dams, are derived from studies involving 58 compounds, five of which were judged to be teratogenic.

Abnormalities, Drug-Induced↗
PubMed1976

Levels of spontaneous malformations in the CD rat and the CD-1 mouse.

Extensive information was supplied about the frequencies and types of spontaneous skeletal and visceral malformations in control and test fetuses which may be encountered during teratological assays. Data were also provided on fertility, agerage body weights, water consumption as a function of diet, and food consumption. The two strains used, Crl:COBS CD (SD) BR (France) rats and Crl:CD-1 (ICR) BR (France) mice, are valuable research tools since they are prolific, have a low rate of spontaneous malformations, and are responsive to teratogenic agents. The difficulties of determining the significance of infrequent anomalies were discussed.

Animals↗