Nowak R A, Samaras S E, Chorney M C, Hagen D R, Dziuk P J
Am J Obstet Gynecol. 1987 Aug;157(2):464-7. doi: 10.1016/s0002-9378(87)80196-5.
Lambs with spinal cords that had been severed near the head at 50 days of gestation were born after a shortened gestation of about 128 days. Lambs with severed spinal cords born as a twin with an intact lamb had a normal gestation of 148 days. The presence of an intact spinal cord or the signals that it might carry apparently influence the length of gestation in the ewe.
在妊娠50天时脊髓在头部附近被切断的羔羊，在约128天的缩短妊娠期后出生。与脊髓完整的羔羊孪生出生的脊髓切断羔羊的正常妊娠期为148天。完整脊髓的存在或其可能携带的信号显然会影响母羊的妊娠期长度。
