Hoagland T A, Diekman M A, Malven P V
J Anim Sci. 1981 Aug;53(2):467-72. doi: 10.2527/jas1981.532467x.
Concentrations of prolactin (PRL) were quantified in blood serum collected by cannula from prepubertal gilts and by venipuncture from young boars. Subjecting the gilts to a 1-min experimental stress, which consisted of physical restraint with a snare, did not significantly affect serum PRL. However, injection of 50 micrograms thyrotropin releasing hormone (TRH) abruptly increased serum PRL within 5 minutes. In a second experiment with gilts, the stress of vascular cannulation did not increase serum PRL during the ensuing 4-hr period in comparison with concentrations in other gilts cannulated 90 min or 18 hr earlier. Venipuncture samples were obtained biweekly from boars exposed to natural lighting or to supplemental lighting that extended the photoperiod to 15 hr/day. Supplemental lighting did not affect serum concentrations of PRL of board during the period from 17 to 33 weeks of age. Thus, PRL release in swine was resistant to stress and to supplemental lighting, two factors which readily cause PRL release in other species. However, the PRL response to exogenous TRH was similar to that observed in other species.
通过套管采集青春期前后备母猪的血清以及通过静脉穿刺采集年轻公猪的血清，对其中催乳素（PRL）的浓度进行了定量分析。让后备母猪遭受1分钟的实验性应激（包括用圈套进行身体束缚），并未显著影响血清PRL水平。然而，注射50微克促甲状腺激素释放激素（TRH）可在5分钟内使血清PRL水平急剧升高。在另一项针对后备母猪的实验中，与90分钟或18小时前进行血管插管的其他后备母猪相比，血管插管应激在随后的4小时内并未使血清PRL升高。每两周从暴露于自然光照或补充光照（将光照周期延长至15小时/天）的公猪身上采集静脉穿刺样本。在17至33周龄期间，补充光照并未影响公猪血清PRL的浓度。因此，猪的PRL释放对压力和补充光照具有抗性，而这两个因素在其他物种中很容易引起PRL释放。然而，PRL对外源TRH的反应与在其他物种中观察到的反应相似。
