Smale L, Lee T M, Nelson R J, Zucker I
Department of Psychology, University of California, Berkeley 94720.
J Exp Zool. 1990 Feb;253(2):186-8. doi: 10.1002/jez.1402530208.
To test whether growth of the winter coat in short day lengths is contingent on suppression of plasma prolactin (Prl) levels, female meadow voles (Microtus pennsylvanicus) were kept in short day lengths for 12 weeks and were injected daily with saline or Prl; long-day animals were treated with either the dopamine agonist, bromocryptine (bromo), bromo plus Prl, or saline. Prl treatment prevented the growth of the winter coat normally observed after 12 weeks in short day lengths, but bromocryptine did not stimulate pelage growth in long-day voles. Pelage growth in short day lengths appears contingent upon decreased plasma prolactin levels.
为了测试短日照条件下冬季被毛的生长是否取决于血浆催乳素（Prl）水平的抑制，将雌性草原田鼠（Microtus pennsylvanicus）置于短日照条件下12周，并每天注射生理盐水或Prl；长日照条件下的动物分别用多巴胺激动剂溴隐亭（bromo）、溴隐亭加Prl或生理盐水处理。Prl处理阻止了短日照条件下12周后通常观察到的冬季被毛的生长，但溴隐亭并未刺激长日照田鼠的被毛生长。短日照条件下的被毛生长似乎取决于血浆催乳素水平的降低。
