Document Detail

Seasonal variation in preovulatory events associated with synchronization of estrus in dwarf goats.
MedLine Citation:
PMID:  11665879     Owner:  NLM     Status:  MEDLINE    
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.
J T Pierson; H Baldassarre; C L Keefer; B R Downey
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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    
Department of Animal Science, McGill University, Quebec, Canada.
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MeSH Terms
Administration, Intravaginal
Estrus / physiology
Estrus Synchronization*
Goats / physiology*
Luteinizing Hormone / secretion
Medroxyprogesterone Acetate / administration & dosage
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

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