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• W1979430625 abstract "Experiments were performed to determine whether the restraint stress-induced decrease of the nocturnal prolactin (PRL) surge affected the length of pseudopregnancy (PSP) and/or the outcome of pregnancy in rats. Vaginal cycles were monitored daily and animals were electro-mechanically cervically stimulated on the morning of metestrus to induce PSP. Animals were restraint stressed by tying the hind legs together with plastic coated bell wire beginning on day 1 of PSP from 0100-0700h with reapplication of stress at 0400h for 6-9 days and then blood sampled for PRL and progesterone plasma levels. Restraint stress significantly decreased plasma PRL (P less than 0.001) and progesterone (P less than 0.05) levels. The length of PSP was significantly decreased (P less than 0.01) for restraint animals and for control animals that were blood sampled compared to control animals that were not sampled. In the pregnancy experiment, animals were mated upon arrival into the laboratory and assigned to one of four groups. For the restraint group, stress was initiated on day 1 of pregnancy as indicated by the presence of sperm in the vaginal lavage. Animals were stressed for 6-9 days for 6 hours during the nocturnal PRL surge as described above. One control group had no treatment; a second control group was sampled only, and a third control group was injected daily with pimozide, a dopamine antagonist, and stressed for 6-9 days. The group which received no treatment had significantly greater (P less than 0.05) incidence of successful pregnancy compared to the other 3 groups; there were no differences (P greater than 0.05) between the sampled, restraint and restraint + pimozide groups in the incidence of successful pregnancy. We conclude that restraint stress during the nocturnal PRL surge minimally affects the length of PSP and that the effect of stress on the outcome of pregnancy is not due to the decrease in nocturnal PRL surge." @default.
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• W1979430625 date "1989-01-01" @default.
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• W1979430625 title "The restraint stress-induced decrease of the nocturnal prolactin surge and the physiology of pseudopregnancy and pregnancy in the rat" @default.
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• W1979430625 doi "https://doi.org/10.1016/0024-3205(89)90252-x" @default.
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