Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species
A unique feature of the reproductive physiology of Asian elephants (Elephas maximus) is the occurrence of two LH surges before ovulation, instead of one. An anovulatory LH (anLH) surge, the function of which is unknown, occurs consistently 3 weeks before the ovulatory LH (ovLH) surge that induces ov...
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th-cmuir.6653943832-74892014-08-30T04:11:39Z Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species Thitaram C. Pongsopawijit P. Chansitthiwet S. Brown J.L. Nimtragul K. Boonprasert K. Homkong P. Mahasawangkul S. Rojanasthien S. Colenbrander B. Van Der Weijden G.C. Van Eerdenburg F.J.C.M. A unique feature of the reproductive physiology of Asian elephants (Elephas maximus) is the occurrence of two LH surges before ovulation, instead of one. An anovulatory LH (anLH) surge, the function of which is unknown, occurs consistently 3 weeks before the ovulatory LH (ovLH) surge that induces ovulation. Thus, the ability to induce an ovLH surge would be useful for scheduling natural mating or artificial insemination. The present study tested the efficacy of a gonadotrophin-releasing hormone agonist (GnRH-Ag) to induce LH surges during the follicular phase of the oestrous cycle, which resulted in varied LH responses, but generally none were as high as previously documented natural surges. Thus, for the ovulation-induction trials, nine females were administered 80 g GnRH-Ag intravenously at three time periods during the oestrous cycle, namely the anovulatory follicular phase, the ovulatory follicular phase and the luteal phase. During the late anovulatory follicular phase, nine of 10 females (90%) responded with an immediate LH surge followed 1522 days later by an ovLH surge or a post-ovulatory increase in progestagens. In contrast, despite responding to the GnRH-Ag with an immediate increase in LH, none of the females treated during other periods of the oestrous cycle exhibited subsequent ovLH surges. One cow got pregnant from natural mating following the induced ovLH surge. In conclusion, ovLH induction is possible using a GnRH-Ag, but only during a specific time of the anovulatory follicular phase. 2014-08-30T04:11:39Z 2014-08-30T04:11:39Z 2009 Article 10313613 10.1071/RD08296 19486604 RFDEE http://www.scopus.com/inward/record.url?eid=2-s2.0-67649695568&partnerID=40&md5=8652172b63105ea414b2591b27346455 http://www.ncbi.nlm.nih.gov/pubmed/19486604 http://cmuir.cmu.ac.th/handle/6653943832/7489 English |
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A unique feature of the reproductive physiology of Asian elephants (Elephas maximus) is the occurrence of two LH surges before ovulation, instead of one. An anovulatory LH (anLH) surge, the function of which is unknown, occurs consistently 3 weeks before the ovulatory LH (ovLH) surge that induces ovulation. Thus, the ability to induce an ovLH surge would be useful for scheduling natural mating or artificial insemination. The present study tested the efficacy of a gonadotrophin-releasing hormone agonist (GnRH-Ag) to induce LH surges during the follicular phase of the oestrous cycle, which resulted in varied LH responses, but generally none were as high as previously documented natural surges. Thus, for the ovulation-induction trials, nine females were administered 80 g GnRH-Ag intravenously at three time periods during the oestrous cycle, namely the anovulatory follicular phase, the ovulatory follicular phase and the luteal phase. During the late anovulatory follicular phase, nine of 10 females (90%) responded with an immediate LH surge followed 1522 days later by an ovLH surge or a post-ovulatory increase in progestagens. In contrast, despite responding to the GnRH-Ag with an immediate increase in LH, none of the females treated during other periods of the oestrous cycle exhibited subsequent ovLH surges. One cow got pregnant from natural mating following the induced ovLH surge. In conclusion, ovLH induction is possible using a GnRH-Ag, but only during a specific time of the anovulatory follicular phase. |
format |
Article |
author |
Thitaram C. Pongsopawijit P. Chansitthiwet S. Brown J.L. Nimtragul K. Boonprasert K. Homkong P. Mahasawangkul S. Rojanasthien S. Colenbrander B. Van Der Weijden G.C. Van Eerdenburg F.J.C.M. |
spellingShingle |
Thitaram C. Pongsopawijit P. Chansitthiwet S. Brown J.L. Nimtragul K. Boonprasert K. Homkong P. Mahasawangkul S. Rojanasthien S. Colenbrander B. Van Der Weijden G.C. Van Eerdenburg F.J.C.M. Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species |
author_facet |
Thitaram C. Pongsopawijit P. Chansitthiwet S. Brown J.L. Nimtragul K. Boonprasert K. Homkong P. Mahasawangkul S. Rojanasthien S. Colenbrander B. Van Der Weijden G.C. Van Eerdenburg F.J.C.M. |
author_sort |
Thitaram C. |
title |
Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species |
title_short |
Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species |
title_full |
Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species |
title_fullStr |
Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species |
title_full_unstemmed |
Induction of the ovulatory LH surge in Asian elephants (Elephas maximus): A novel aid in captive breeding management of an endangered species |
title_sort |
induction of the ovulatory lh surge in asian elephants (elephas maximus): a novel aid in captive breeding management of an endangered species |
publishDate |
2014 |
url |
http://www.scopus.com/inward/record.url?eid=2-s2.0-67649695568&partnerID=40&md5=8652172b63105ea414b2591b27346455 http://www.ncbi.nlm.nih.gov/pubmed/19486604 http://cmuir.cmu.ac.th/handle/6653943832/7489 |
_version_ |
1681420809273344000 |