Wongkaweewit Kittiwat, Prommachart Puchong, Raksasub Rattawat, Buranaamnuay Kakanang, Techakumphu Mongkol, De Rensis Fabio, Tummaruk Padet
Faculty of Veterinary Science, Chulalongkorn University, Bangkok, 10330, Thailand.
Trop Anim Health Prod. 2012 Mar;44(3):467-70. doi: 10.1007/s11250-011-9920-3. Epub 2011 Jul 8.
The aim of the present study was to evaluate the control of ovulation by the administration of human chorionic gonadotropin (hCG) or gonadotropin-releasing hormone (GnRH) at the onset of estrus. Thirty-three multiparous sows housed under tropical conditions and showing standing estrus within 5 days after weaning were included. The sows were allocated to three groups, spontaneous ovulation (control group, n = 10), induced ovulation using 750 IU hCG (hCG group, n = 10), and induced ovulation using 50 μg GnRH (GnRH group, n = 13). The hormones were given at the onset of estrus and the occurrence of ovulation was monitored every 6 h by transrectal ultrasonography. Data for weaning-to-estrus interval, onset of estrus-to-ovulation interval (EOI), and the length of estrus were recorded. All sows in the control and hCG groups ovulated, while 3 out of 13 sows treated with GnRH developed cystic ovaries (did not ovulate). Of those sows ovulating, the EOI of the hCG (40.2 ± 1.7 h) and GnRH (37.5 ± 3.3 h) groups were shorter than that of the control group (63.6 ± 9.6 h; P < 0.05). In conclusion, the administration of either hCG or GnRH at the onset of estrus can control time of ovulation but, at the dose employed, sows receiving GnRH may develop ovarian cysts.
本研究的目的是评估在发情开始时给予人绒毛膜促性腺激素（hCG）或促性腺激素释放激素（GnRH）对排卵的控制情况。纳入了33头在热带条件下饲养、断奶后5天内出现静立发情的经产母猪。将这些母猪分为三组，即自然排卵组（对照组，n = 10）、使用750 IU hCG诱导排卵组（hCG组，n = 10）和使用50 μg GnRH诱导排卵组（GnRH组，n = 13）。在发情开始时给予激素，并通过经直肠超声检查每6小时监测一次排卵情况。记录断奶至发情间隔、发情开始至排卵间隔（EOI）以及发情持续时间的数据。对照组和hCG组的所有母猪均排卵，而在13头接受GnRH治疗的母猪中，有3头出现了卵巢囊肿（未排卵）。在那些排卵的母猪中，hCG组（40.2±1.7小时）和GnRH组（37.5±3.3小时）的EOI短于对照组（63.6±9.6小时；P<0.05）。总之，在发情开始时给予hCG或GnRH均可控制排卵时间，但在所使用的剂量下，接受GnRH的母猪可能会出现卵巢囊肿。
