Document Detail

Improvement of pregnancy rate in Japanese Black cows by administration of hCG to recipients of transferred frozen-thawed embryos.
MedLine Citation:
PMID:  12374129     Owner:  NLM     Status:  MEDLINE    
Japanese Black primiparous and multiparous beef cows (n = 120) were selected as recipients and randomly divided into three groups (A, B, and C) of 40 recipients each. Group A received an intramuscular (i.m.) treatment of 1500 IU human chorionic gonadotropin (hCG) on day 1 (day 0 = onset of estrus), while Group B received an i.m. treatment of hCG on day 6. Group C received an i.m. treatment of 5 ml saline on day 6 as a control. On day 7, frozen-thawed embryo transfer was conducted in all groups, and pregnancy was diagnosed by palpated per rectum 40-50 days after the transfer. Twelve recipients were randomly selected from each group. Plasma progesterone (P) and estradiol-17beta (E2) concentrations were determined in these recipients on days 6, 7 and 14, and at the time of pregnancy diagnosis, and their ovaries were examined for a corpus luteum and follicles by palpated per rectum. The pregnancy rate in Group B was higher (67.5%. P < 0.05) than the rate in Group C (45.0%) and in Group A (42.5%). The plasma P concentration on day 14 tended to be higher although not significantly in Group B than in Groups C and A. At the time of pregnancy diagnosis, the blood P concentration of pregnant recipients in Group B was higher (P < 0.05) than that of those in Groups C and A. The plasma E2 concentrations on days 7 and 14 were lower (P < 0.05) in Group B than in Groups C and A. These results showed that administration of hCG 6 days after estrus improved the pregnancy rate for non-surgical frozen embryo transfer 7 days after estrus by enhancing luteal function and depressing E2 secretion.
M Nishigai; H Kamomae; T Tanaka; Y Kaneda
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Theriogenology     Volume:  58     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2002 Nov 
Date Detail:
Created Date:  2002-10-10     Completed Date:  2002-12-31     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1597-606     Citation Subset:  IM    
Laboratory of Veterinary Reproduction, Tokyo University of Agriculture and Technology, Fuchu, Japan.
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MeSH Terms
Cattle / embryology,  physiology*
Chorionic Gonadotropin / administration & dosage,  pharmacology*
Embryo Transfer / veterinary*
Estradiol / blood
Insemination, Artificial / veterinary*
Progesterone / blood
Random Allocation
Reg. No./Substance:
0/Chorionic Gonadotropin; 50-28-2/Estradiol; 57-83-0/Progesterone

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