| Improvement of pregnancy rate in Japanese Black cows by administration of hCG to recipients of transferred frozen-thawed embryos. | |
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MedLine Citation:
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PMID: 12374129 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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M Nishigai; H Kamomae; T Tanaka; Y Kaneda |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Theriogenology Volume: 58 ISSN: 0093-691X ISO Abbreviation: Theriogenology Publication Date: 2002 Nov |
Date Detail:
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Created Date: 2002-10-10 Completed Date: 2002-12-31 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0421510 Medline TA: Theriogenology Country: United States |
Other Details:
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Languages: eng Pagination: 1597-606 Citation Subset: IM |
Affiliation:
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Laboratory of Veterinary Reproduction, Tokyo University of Agriculture and Technology, Fuchu, Japan. nisigai@lib.bekkoame.ne.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cattle / embryology, physiology* Chorionic Gonadotropin / administration & dosage, pharmacology* Embryo Transfer / veterinary* Estradiol / blood Female Insemination, Artificial / veterinary* Male Pregnancy Progesterone / blood Random Allocation |
| Chemical | |
Reg. No./Substance:
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0/Chorionic Gonadotropin; 50-28-2/Estradiol; 57-83-0/Progesterone |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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