| Seasonal variation in preovulatory events associated with synchronization of estrus in dwarf goats. | |
| | |
MedLine Citation:
|
PMID: 11665879 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
This experiment was conducted to define the temporal relationships among estrus, the LH surge and ovulation after estrus synchronization in dwarf goats and to assess the effect of season on these parameters. In November (breeding season), March (transition period) and July (non-breeding season), estrus was synchronized in 12 dwarf goats by means of intravaginal sponges containing 60 mg medroxyprogesterone acetate (MAP) for 10 d, coupled with 125 microg cloprostenol i.m. 48 h before sponge removal and 300 IU eCG i.m. at sponge removal. A different group of animals was used during each time period. Onset of estrus was monitored using two males, and blood samples for the measurement of plasma LH were collected at 2-h intervals from 24 to 60 h after sponge removal. Ovulation was confirmed by laparoscopy at 54 and 72 h after sponge removal. A seasonal shift was detected in the intervals to onset of estrus, LH surge, and ovulation after sponge removal (P<0.05), with sponge removal to onset of estrus being shorter (P<0.05) in November (25.0 +/- 1.56 h) and July (28.9 +/- 2.43 h) than in March (40.9 +/- 3.27 h). The intervals between onset of estrus and the LH surge and between the LH surge and ovulation were found to be constant throughout the different seasons. An optimal time for breeding, artificial insemination, oocyte and embryo recovery, and embryo transfer may be predicted using information gained from these studies. |
| | |
Authors:
|
J T Pierson; H Baldassarre; C L Keefer; B R Downey |
Related Documents
:
|
1976479 - Effect of bacterial pyrogen on three lizard species. 21367319 - 337 production of transgenic sheep using recombinant lentivirus microinjection of in vi... 5788699 - Biosynthesis of riboflavine in corynebacterium species: the purine precursor. 9852259 - The role of melatonin in the human fetus (review). 3377319 - Seasonal prevalence of gastrointestinal nematodes of beef calves grazed on irrigated pa... 21353369 - Maternal plasma lipopolysaccharide binding protein (lbp) concentrations in pregnancy co... 22889289 - Evaluation of neonatal outcomes in elective repeat cesarean delivery at term according ... 7176289 - Fetal mortality associated with cleft lip and cleft palate. 20166149 - First-trimester assessment of placenta function and the prediction of preeclampsia and ... |
Publication Detail:
|
Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Theriogenology Volume: 56 ISSN: 0093-691X ISO Abbreviation: Theriogenology Publication Date: 2001 Sep |
Date Detail:
|
Created Date: 2001-10-22 Completed Date: 2001-12-04 Revised Date: 2009-11-19 |
Medline Journal Info:
|
Nlm Unique ID: 0421510 Medline TA: Theriogenology Country: United States |
Other Details:
|
Languages: eng Pagination: 759-69 Citation Subset: IM |
Affiliation:
|
Department of Animal Science, McGill University, Quebec, Canada. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Administration, Intravaginal Animals Estrus / physiology Estrus Synchronization* Female Goats / physiology* Luteinizing Hormone / secretion Medroxyprogesterone Acetate / administration & dosage Ovulation* Seasons* |
| Chemical | |
Reg. No./Substance:
|
71-58-9/Medroxyprogesterone Acetate; 9002-67-9/Luteinizing Hormone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Effect of homologous preovulatory follicular fluid on in vitro maturation of equine cumulus-oocyte c...
Next Document: Frequency of aneuploidy in pig oocytes matured in vitro and of the corresponding first polar bodies ...