Document Detail

Endocrinological evaluation of the induction of superovulation with PMSG in water buffalo (Bubalus bubalis).
MedLine Citation:
PMID:  16726846     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Ten nonlactating buffalo were superovulated with 3000 IU PMSG. Luteolysis was induced with 500 microg Cloprostenol (PG) 60 and 72 h after PMSG. Five buffalo were alloted for natural mating and five were bred by artificial insemination 60 and 84 h after the first PG treatment. Since four buffalo developed pyometra, only 6 of 10 underwent embryo collection successfully 180 to 190 h after PG. Three buffalo yielded only one morula each, while the remaining three yielded a total of two, three and four morulae and/or blastocysts as well als zero, one and three unfertilized ova, respectively. Six of the ten buffalo were assigned to an intensive blood collection regimen. Mean concentrations of progesterone (ng/ml) increased from 1.9 at PMSG stimulation to 4.8 at induction of luteolysis and decreased to a nadir of 0.2 about 72 h after PG treatment. The preovulatory surge of LH occurred 36 +/- 9 h after PG and was low in magnitude (7.3 +/- 1.3 ng/ml). Stimulation of 3 to 12 follicles resulted in concentrations of estradiol-17beta exceeding 5 pg/ml within 48 h after PMSG treatment and reaching a maximum of 32 +/- 11 pg/ml about the time of the preovulatory surge. Only in two individuals did concentrations decrease below 5 pg/ml within the following 12 h. In the other four buffalo 3 to 10 unovulated structures remained palpable, secreting estradiol-17beta far exceeding the preovulatory concentrations. The fast appearing, low magnitude LH surges were key problems resulting from PMSG treatment. They caused unovulated endocrinologically active follicles. High estrogen levels during the early luteal period may activate subclinical uterine infections, which in turn may negatively affect embryonic development.
E Schallenberger; H G Wagner; R Papa; P Hartl; H Tenhumberg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Theriogenology     Volume:  34     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  1990 Aug 
Date Detail:
Created Date:  2006-05-26     Completed Date:  2009-12-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  379-92     Citation Subset:  -    
Lehrstuhl f??r Physiologie der Fortpflanzung und Laktation, Technische Universit??t M??nchen, 8050 Freising-Weihenstephan, FRG.
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