| Factors associated with shortened estrous cycles after abortion in beef heifers. | |
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MedLine Citation:
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PMID: 3230077 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Forty-six crossbred Hereford heifers were allotted into five experimental groups. Fenprotalene, a prostaglandin analogue, was administered to induce abortion and (or) to regress the corpus luteum (CL) in four groups of heifers about 75 d after conception. The four groups were 1) pregnant heifers, 2) pregnant heifers with the ovary contralateral to the gravid uterine horn removed 24 h after fenprostalene injection, 3) same as Group 2 but with the ipsilateral, rather than the contralateral, ovary removed and 4) heifers with uterus removed (ovaries intact) about 35 d after conception. A fifth group of nonpregnant heifers received implants containing norgestomet from 10 to 76 d after estrus and were given fenprostalene 24 h before removal of the implant. Average length of the first estrous cycle after the fenprostalene injection was 11.2, 8.3, 9.7 and 19.1 for Groups 1, 2, 3 and 5, respectively. Estrous cycles were longer (P less than .05) in norgestomet-treated heifers. Hysterectomized heifers (Group 4) did not exhibit a second estrus by 50 d after fenprostalene treatment; otherwise, all first estrous cycles after the fenprostalene injection were either "short" (7 to 13 d) or "normal" (17 to 23 d). Twenty-two of 24 heifers that aborted had short estrous cycles and two had normal estrous cycles. Short estrous cycles occurred after abortion regardless of whether the ovary ipsilateral or contralateral to the previously gravid uterine horn ovulated. Early regression of the CL (short luteal phase) did not occur in nonpregnant heifers after long-term progestogen stimulation or after hysterectomy, but it did occur in heifers with a previously gravid uterus.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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J M Wright; G H Kiracofe; K B Beeman |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of animal science Volume: 66 ISSN: 0021-8812 ISO Abbreviation: J. Anim. Sci. Publication Date: 1988 Dec |
Date Detail:
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Created Date: 1989-04-13 Completed Date: 1989-04-13 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 3185-9 Citation Subset: IM |
Affiliation:
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Dept. of Anim. Sci. and Ind., Kansas State University, Manhattan 66506. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abortifacient Agents
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pharmacology* Abortifacient Agents, Nonsteroidal / pharmacology* Abortion, Induced / veterinary* Abortion, Veterinary / physiopathology* Animals Cattle / physiology* Estrus / drug effects, physiology* Female Hysterectomy / veterinary Luteolysis / drug effects Ovariectomy / veterinary Pregnancy Prostaglandins F, Synthetic / pharmacology* |
| Chemical | |
Reg. No./Substance:
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0/Abortifacient Agents; 0/Abortifacient Agents, Nonsteroidal; 0/Prostaglandins F, Synthetic; 69381-94-8/fenprostalene |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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