title: Influence of prenatal steroid exposure on neonatal gonadotropin imprinting. Effect of single and combined hormone treatments on the chicken ovary.
abstract: Chicken embryos treated with DES or AE at the 9th day of incubation showed postnatally an increase in ovarian mass, parenchymal zone thickness, follicle diameter and granulosa cell count. Perinatal gonadotropin treatment had a similar effect on these parameters in the control birds not receiving pretreatment, but had no influence on them in the birds pretreated with steroid. The tested ovarian parameters of the DES- and AE-pretreated birds still differed from the control at 6 weeks of age. Neonatal gonadotropin exposure induced imprinting in the birds not pretreated with steroid, to judge from an increased response (indicated by changed values of the tested parameters) to gonadotropin reexposure in adulthood. Similar, but considerably slighter changes were also shown by the steroid pretreated birds. It follows that in the birds prenatally exposed to AE or DES, supervening perinatal exposure to gonadotropin did not elicit greater changes than the prenatal exposure itself.
mesh_terms: D000500:Allylestrenol / Q000494:pharmacology*; D000818:Animals; D002642:Chick Embryo; D002645:Chickens; D004054:Diethylstilbestrol / Q000494:pharmacology*; D004963:Estrenes / Q000494:pharmacology*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology*; D006107:Granulosa Cells / Q000187:drug effects; D007986:Luteinizing Hormone / Q000494:pharmacology*; D010053:Ovary / Q000187:drug effects* / Q000196:embryology / Q000254:growth & development; D013997:Time Factors
chemical_list: D004963:Estrenes; D004054:Diethylstilbestrol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D000500:Allylestrenol