title: [Effect of the light regimen on the sensitivity of the chicken reproductive system to exogenous progesterone].
abstract: In hens kept under the conditions of a short daytime (4L:18D), progesterone injections (0.25 and 10 mukg/kg) significantly decrease ovulation frequency. At longer photoperiod (14L : 10D), this effect was observed only with a dose of 10 mukg/kg, being rather weak in its intensity. It is concluded that short daytime may inhibit the activity of reproductive system increasing its sensitivity to the inhibitory effect of progesterone.
mesh_terms: D000818:Animals; D002645:Chickens / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D008027:Light; D010053:Ovary / Q000187:drug effects / Q000528:radiation effects; D011374:Progesterone / Q000494:pharmacology*; D012098:Reproduction / Q000187:drug effects* / Q000528:radiation effects
chemical_list: D011374:Progesterone
vernacular_title: Vliianie svetovogo rezhima na chuvstvitel'nost' reproduktivnoĭ sistemy kur k ékzogennomu progesteronu.