| Comparison of long- versus short-term CIDR-based protocols to synchronize estrus prior to fixed-time AI in postpartum beef cows. | |
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MedLine Citation:
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PMID: 22560859 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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This experiment was conducted to compare pregnancy rates in postpartum beef cows resulting from fixed-time AI (FTAI) after treatment with controlled internal drug release (CIDR)-based protocols to synchronize estrus. Cows assigned to the Show-Me-Synch (n=167) protocol received a CIDR from d 0 to 14, and prostaglandin F(2α) (PGF(2α)) on d 30. Cows assigned to 7-d CO-Synch+CIDR (n=177) received a CIDR and gonadotropin releasing hormone (GnRH) on d 23. On d 30, CIDRs were removed and PGF(2α) was administered. Blood sampling occurred on d -10 and 0 of treatment to determine estrous cyclicity status (progesterone ≥0.5ng/mL estrous cycling). Treatments were balanced on age, DPP and BCS. Estrous detection was performed using HeatWatch from PGF(2α) to FTAI. Artificial insemination was performed at predetermined fixed times (72h, Show-Me-Synch; 66h, 7-d CO-Synch+CIDR) and all cows were administered GnRH at FTAI. This experiment was conducted over a two year period; no differences were found between years so the data were pooled for further analysis. Pregnancy rate resulting from FTAI did not differ (P>0.10) between technicians or AI sires. Pregnancy rate resulting from FTAI was similar between treatments (P=0.20); however, cows that exhibited estrus prior to FTAI had a higher pregnancy rate (P<0.01) than for those that did not. Pregnancy rate at the end of the breeding period was similar between treatments (P=0.28). In summary, FTAI pregnancy rates were similar among postpartum beef cows following treatment with either a short- or long-term CIDR-based estrous synchronization protocol. |
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Authors:
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J M Nash; D A Mallory; M R Ellersieck; S E Poock; M F Smith; D J Patterson |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-4-4 |
Journal Detail:
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Title: Animal reproduction science Volume: - ISSN: 1873-2232 ISO Abbreviation: - Publication Date: 2012 Apr |
Date Detail:
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Created Date: 2012-5-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7807205 Medline TA: Anim Reprod Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012 Elsevier B.V. All rights reserved. |
Affiliation:
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Division of Animal Science, University of Missouri, Columbia, S132 ASRC, 920 E. Campus Dr., Columbia, MO 65211, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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