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Influence of GnRH administration on timing of the LH surge and ovulation in dwarf goats
This study was conducted to determine whether or not exogenous gonadotropin releasing hormone (GnRH) alters the timing or improves the synchrony of estrus, the LH surge, and ovulation following estrous synchronization in dwarf goats, and to assess the effects of season on these parameters. In Januar...
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| Published in: | Theriogenology 2003-08, Vol.60 (3), p.397-406 |
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| cites | cdi_FETCH-LOGICAL-c385t-d606d7bd489684fd7d6e396e5c102a52b9623d7fc2c79e897c9f43f77d16df8f3 |
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| container_start_page | 397 |
| container_title | Theriogenology |
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| creator | Pierson, Janice T. Baldassarre, Hernan Keefer, Carol L. Downey, Bruce R. |
| description | This study was conducted to determine whether or not exogenous gonadotropin releasing hormone (GnRH) alters the timing or improves the synchrony of estrus, the LH surge, and ovulation following estrous synchronization in dwarf goats, and to assess the effects of season on these parameters. In January and June, estrus was synchronized in 12 Pygmy and Nigerian Dwarf goats with a 10-day progestagen sponge, 125
μg cloprostenol i.m. 48
h before sponge removal, and 300
IU equine chorionic gonadotrophin (eCG) i.m. at sponge removal. Six of the 12 goats were given 50
μg GnRH i.m. 24
h after sponge removal. Onset of estrus was monitored using two males. Samples for plasma LH were collected at 2
h intervals beginning 22
h after sponge removal and ending at 48
h in January and at 58
h in June. Time of ovulation time was confirmed by laparoscopy at 36, 50, 60, and 74
h in January and at 50, 60, and 74
h in June. Administration of GnRH had no significant effect on the onset of estrus; however, it reduced the interval from sponge removal to the LH surge and improved the synchrony of the LH surge (
P |
| doi_str_mv | 10.1016/S0093-691X(03)00037-2 |
| format | article |
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μg cloprostenol i.m. 48
h before sponge removal, and 300
IU equine chorionic gonadotrophin (eCG) i.m. at sponge removal. Six of the 12 goats were given 50
μg GnRH i.m. 24
h after sponge removal. Onset of estrus was monitored using two males. Samples for plasma LH were collected at 2
h intervals beginning 22
h after sponge removal and ending at 48
h in January and at 58
h in June. Time of ovulation time was confirmed by laparoscopy at 36, 50, 60, and 74
h in January and at 50, 60, and 74
h in June. Administration of GnRH had no significant effect on the onset of estrus; however, it reduced the interval from sponge removal to the LH surge and improved the synchrony of the LH surge (
P<0.05). Treatment with GnRH also reduced the interval from sponge removal to ovulation and improved the synchrony of ovulation (
P<0.05). Season had a significant effect on the timing and the synchrony of estrus with and without GnRH treatment (
P<0.05). A seasonal shift was also observed in the timing of the LH surge in the absence of GnRH treatment (
P<0.05). Further research is required to determine the optimum time for GnRH administration and the minimum effective dose in dwarf goats.</description><identifier>ISSN: 0093-691X</identifier><identifier>EISSN: 1879-3231</identifier><identifier>DOI: 10.1016/S0093-691X(03)00037-2</identifier><identifier>PMID: 12763154</identifier><language>eng</language><publisher>United States: Elsevier Inc</publisher><subject>Administration, Intravaginal ; Animals ; Chorionic Gonadotropin - administration & dosage ; cloprostenol ; Cloprostenol - administration & dosage ; Dwarf goats ; equine chorionic gonadotropin ; estrus ; Estrus Detection ; Estrus Synchronization ; Female ; GnRH ; goats ; Goats - physiology ; gonadotropin-releasing hormone ; Gonadotropin-Releasing Hormone - administration & dosage ; Horses ; Kinetics ; laparoscopy ; LH surge ; luteinizing hormone ; Luteinizing Hormone - blood ; Luteinizing Hormone - metabolism ; males ; Medroxyprogesterone Acetate - administration & dosage ; Nigerian Dwarf (goat breed) ; Ovulation ; Ovulation - drug effects ; sampling ; Season ; Seasons ; Time Factors</subject><ispartof>Theriogenology, 2003-08, Vol.60 (3), p.397-406</ispartof><rights>2003 Elsevier Science Inc.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c385t-d606d7bd489684fd7d6e396e5c102a52b9623d7fc2c79e897c9f43f77d16df8f3</citedby><cites>FETCH-LOGICAL-c385t-d606d7bd489684fd7d6e396e5c102a52b9623d7fc2c79e897c9f43f77d16df8f3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/12763154$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Pierson, Janice T.</creatorcontrib><creatorcontrib>Baldassarre, Hernan</creatorcontrib><creatorcontrib>Keefer, Carol L.</creatorcontrib><creatorcontrib>Downey, Bruce R.</creatorcontrib><title>Influence of GnRH administration on timing of the LH surge and ovulation in dwarf goats</title><title>Theriogenology</title><addtitle>Theriogenology</addtitle><description>This study was conducted to determine whether or not exogenous gonadotropin releasing hormone (GnRH) alters the timing or improves the synchrony of estrus, the LH surge, and ovulation following estrous synchronization in dwarf goats, and to assess the effects of season on these parameters. In January and June, estrus was synchronized in 12 Pygmy and Nigerian Dwarf goats with a 10-day progestagen sponge, 125
μg cloprostenol i.m. 48
h before sponge removal, and 300
IU equine chorionic gonadotrophin (eCG) i.m. at sponge removal. Six of the 12 goats were given 50
μg GnRH i.m. 24
h after sponge removal. Onset of estrus was monitored using two males. Samples for plasma LH were collected at 2
h intervals beginning 22
h after sponge removal and ending at 48
h in January and at 58
h in June. Time of ovulation time was confirmed by laparoscopy at 36, 50, 60, and 74
h in January and at 50, 60, and 74
h in June. Administration of GnRH had no significant effect on the onset of estrus; however, it reduced the interval from sponge removal to the LH surge and improved the synchrony of the LH surge (
P<0.05). Treatment with GnRH also reduced the interval from sponge removal to ovulation and improved the synchrony of ovulation (
P<0.05). Season had a significant effect on the timing and the synchrony of estrus with and without GnRH treatment (
P<0.05). A seasonal shift was also observed in the timing of the LH surge in the absence of GnRH treatment (
P<0.05). Further research is required to determine the optimum time for GnRH administration and the minimum effective dose in dwarf goats.</description><subject>Administration, Intravaginal</subject><subject>Animals</subject><subject>Chorionic Gonadotropin - administration & dosage</subject><subject>cloprostenol</subject><subject>Cloprostenol - administration & dosage</subject><subject>Dwarf goats</subject><subject>equine chorionic gonadotropin</subject><subject>estrus</subject><subject>Estrus Detection</subject><subject>Estrus Synchronization</subject><subject>Female</subject><subject>GnRH</subject><subject>goats</subject><subject>Goats - physiology</subject><subject>gonadotropin-releasing hormone</subject><subject>Gonadotropin-Releasing Hormone - administration & dosage</subject><subject>Horses</subject><subject>Kinetics</subject><subject>laparoscopy</subject><subject>LH surge</subject><subject>luteinizing hormone</subject><subject>Luteinizing Hormone - blood</subject><subject>Luteinizing Hormone - metabolism</subject><subject>males</subject><subject>Medroxyprogesterone Acetate - administration & dosage</subject><subject>Nigerian Dwarf (goat breed)</subject><subject>Ovulation</subject><subject>Ovulation - drug effects</subject><subject>sampling</subject><subject>Season</subject><subject>Seasons</subject><subject>Time Factors</subject><issn>0093-691X</issn><issn>1879-3231</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNqF0FtLwzAYgOEgis7DT1BzJXpRzaFNmiuRoU4YCE7Ru5DlMCNdo0k78d_b2qGXQiAQni8JLwCHGJ1jhNnFDCFBMybwyymiZwghyjOyAUa45CKjhOJNMPolO2A3pbceMYa3wQ4mnFFc5CPwfFe7qrW1tjA4eFs_TKAyS1_71ETV-FDDbjW-O1n0oHm1cDqBqY0LC1VtYFi11eB8Dc2nig4ugmrSPthyqkr2YL3vgaeb68fxJJve396Nr6aZpmXRZIYhZvjc5KVgZe4MN8xSwWyhMSKqIHPBCDXcaaK5sKXgWricOs4NZsaVju6Bk-He9xg-WpsaufRJ26pStQ1tkpxSTHNRdLAYoI4hpWidfI9-qeKXxEj2ReVPUdnnkojKn6KSdHNH6wfa-dKav6l1wg4cD8CpINUi-iSfZgThAiGCGBNlJy4HYbsQK2-jTNr3yY2PVjfSBP_PJ74BYZaO0g</recordid><startdate>20030801</startdate><enddate>20030801</enddate><creator>Pierson, Janice T.</creator><creator>Baldassarre, Hernan</creator><creator>Keefer, Carol L.</creator><creator>Downey, Bruce R.</creator><general>Elsevier Inc</general><scope>FBQ</scope><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20030801</creationdate><title>Influence of GnRH administration on timing of the LH surge and ovulation in dwarf goats</title><author>Pierson, Janice T. ; Baldassarre, Hernan ; Keefer, Carol L. ; Downey, Bruce R.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c385t-d606d7bd489684fd7d6e396e5c102a52b9623d7fc2c79e897c9f43f77d16df8f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>Administration, Intravaginal</topic><topic>Animals</topic><topic>Chorionic Gonadotropin - administration & dosage</topic><topic>cloprostenol</topic><topic>Cloprostenol - administration & dosage</topic><topic>Dwarf goats</topic><topic>equine chorionic gonadotropin</topic><topic>estrus</topic><topic>Estrus Detection</topic><topic>Estrus Synchronization</topic><topic>Female</topic><topic>GnRH</topic><topic>goats</topic><topic>Goats - physiology</topic><topic>gonadotropin-releasing hormone</topic><topic>Gonadotropin-Releasing Hormone - administration & dosage</topic><topic>Horses</topic><topic>Kinetics</topic><topic>laparoscopy</topic><topic>LH surge</topic><topic>luteinizing hormone</topic><topic>Luteinizing Hormone - blood</topic><topic>Luteinizing Hormone - metabolism</topic><topic>males</topic><topic>Medroxyprogesterone Acetate - administration & dosage</topic><topic>Nigerian Dwarf (goat breed)</topic><topic>Ovulation</topic><topic>Ovulation - drug effects</topic><topic>sampling</topic><topic>Season</topic><topic>Seasons</topic><topic>Time Factors</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pierson, Janice T.</creatorcontrib><creatorcontrib>Baldassarre, Hernan</creatorcontrib><creatorcontrib>Keefer, Carol L.</creatorcontrib><creatorcontrib>Downey, Bruce R.</creatorcontrib><collection>AGRIS</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Theriogenology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pierson, Janice T.</au><au>Baldassarre, Hernan</au><au>Keefer, Carol L.</au><au>Downey, Bruce R.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of GnRH administration on timing of the LH surge and ovulation in dwarf goats</atitle><jtitle>Theriogenology</jtitle><addtitle>Theriogenology</addtitle><date>2003-08-01</date><risdate>2003</risdate><volume>60</volume><issue>3</issue><spage>397</spage><epage>406</epage><pages>397-406</pages><issn>0093-691X</issn><eissn>1879-3231</eissn><abstract>This study was conducted to determine whether or not exogenous gonadotropin releasing hormone (GnRH) alters the timing or improves the synchrony of estrus, the LH surge, and ovulation following estrous synchronization in dwarf goats, and to assess the effects of season on these parameters. In January and June, estrus was synchronized in 12 Pygmy and Nigerian Dwarf goats with a 10-day progestagen sponge, 125
μg cloprostenol i.m. 48
h before sponge removal, and 300
IU equine chorionic gonadotrophin (eCG) i.m. at sponge removal. Six of the 12 goats were given 50
μg GnRH i.m. 24
h after sponge removal. Onset of estrus was monitored using two males. Samples for plasma LH were collected at 2
h intervals beginning 22
h after sponge removal and ending at 48
h in January and at 58
h in June. Time of ovulation time was confirmed by laparoscopy at 36, 50, 60, and 74
h in January and at 50, 60, and 74
h in June. Administration of GnRH had no significant effect on the onset of estrus; however, it reduced the interval from sponge removal to the LH surge and improved the synchrony of the LH surge (
P<0.05). Treatment with GnRH also reduced the interval from sponge removal to ovulation and improved the synchrony of ovulation (
P<0.05). Season had a significant effect on the timing and the synchrony of estrus with and without GnRH treatment (
P<0.05). A seasonal shift was also observed in the timing of the LH surge in the absence of GnRH treatment (
P<0.05). Further research is required to determine the optimum time for GnRH administration and the minimum effective dose in dwarf goats.</abstract><cop>United States</cop><pub>Elsevier Inc</pub><pmid>12763154</pmid><doi>10.1016/S0093-691X(03)00037-2</doi><tpages>10</tpages></addata></record> |
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| ispartof | Theriogenology, 2003-08, Vol.60 (3), p.397-406 |
| issn | 0093-691X 1879-3231 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_73313495 |
| source | Elsevier |
| subjects | Administration, Intravaginal Animals Chorionic Gonadotropin - administration & dosage cloprostenol Cloprostenol - administration & dosage Dwarf goats equine chorionic gonadotropin estrus Estrus Detection Estrus Synchronization Female GnRH goats Goats - physiology gonadotropin-releasing hormone Gonadotropin-Releasing Hormone - administration & dosage Horses Kinetics laparoscopy LH surge luteinizing hormone Luteinizing Hormone - blood Luteinizing Hormone - metabolism males Medroxyprogesterone Acetate - administration & dosage Nigerian Dwarf (goat breed) Ovulation Ovulation - drug effects sampling Season Seasons Time Factors |
| title | Influence of GnRH administration on timing of the LH surge and ovulation in dwarf goats |
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