Pinkert C A, Rampacek G B, Kraeling R R
Animal and Dairy Science Department, University of Georgia, Athens 30602.
J Reprod Fertil. 1988 May;83(1):471-8. doi: 10.1530/jrf.0.0830471.
The temporal relationships of serum prolactin, oestrogen and LH concentrations during the perioestrous period were compared in prepubertal gilts induced to ovulate by PMSG and hCG and in mature gilts. In Exp. 1, 2 sustained prolactin surges, beginning 4 days and 1 day before the preovulatory LH surge, occurred in all mature gilts. A single preovulatory prolactin surge occurred in 3 prepubertal gilts, starting just before the preovulatory LH surge, but 4 prepubertal gilts had neither a prolactin nor an LH surge. A status (prepubertal or mature) versus time interaction (P less than 0.01) was detected for serum prolactin concentrations. A preovulatory oestrogen surge occurred in all gilts but was of lesser magnitude (P less than 0.01) and duration (P less than 0.05) in the prepubertal gilts without prolactin and LH surges compared to mature gilts and of lesser magnitude (P less than 0.01) compared to prepubertal gilts with prolactin and LH surges. The relative timing of the oestrogen surge in prepubertal gilts corresponded with that of mature gilts when adjusted to the LH surge (if present) but was delayed (P less than 0.01) in all prepubertal gilts if standardized to the hCG injection. In Exp. 2, mature gilts were examined to determine whether 2 perioestrous prolactin surges were characteristic of all cycling gilts. Of 9 gilts, 8 exhibited an initial prolactin surge 4-5 days before oestrus and 5/9 gilts exhibited a periovulatory prolactin surge. The presence of 2 perioestrous serum prolactin surges was not a requirement for subsequent pregnancy maintenance.(ABSTRACT TRUNCATED AT 250 WORDS)
在经孕马血清促性腺激素（PMSG）和人绒毛膜促性腺激素（hCG）诱导排卵的青春期前后备母猪以及成年母猪中，比较了发情周期血清催乳素、雌激素和促黄体生成素（LH）浓度的时间关系。在实验1中，所有成年母猪均出现了2次持续的催乳素激增，分别在排卵前LH激增前4天和1天开始。3头青春期前后备母猪出现了单次排卵前催乳素激增，恰好在排卵前LH激增之前开始，但4头青春期前后备母猪既没有催乳素激增也没有LH激增。血清催乳素浓度检测到状态（青春期前或成年）与时间的交互作用（P<0.01）。所有母猪均出现了排卵前雌激素激增，但与成年母猪相比，没有催乳素和LH激增的青春期前后备母猪中，雌激素激增的幅度较小（P<0.01）且持续时间较短（P<0.05），与有催乳素和LH激增的青春期前后备母猪相比，幅度也较小（P<0.01）。青春期前后备母猪中雌激素激增的相对时间，在根据LH激增（如果存在）进行调整时与成年母猪一致，但如果根据hCG注射进行标准化，则在所有青春期前后备母猪中均延迟（P<0.01）。在实验2中，对成年母猪进行检查以确定发情周期的2次催乳素激增是否为所有发情母猪的特征。9头母猪中，8头在发情前4-5天出现了首次催乳素激增，5/9头母猪出现了排卵前后催乳素激增。发情周期血清催乳素出现2次激增并非后续维持妊娠的必要条件。（摘要截断于250字）
