Document Detail


Resumption of postpartum ovarian cyclicity in high-producing Holstein cows.
MedLine Citation:
PMID:  14698054     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The objective of this study was to investigate the resumption of ovarian cyclicity postpartum in high-producing dairy cows in commercial dairy farms under subtropical conditions. The cows were kept in a free-stall or tie-stall barn. Milk samples were collected from cows twice weekly, and progesterone in the skim milk was assayed by double-antibody ELISA. Cows were examined rectally and vaginoscopically at 2-week intervals after calving. Body condition score (BCS) and body weights were taken before and after calving. A cow was considered to have resumed ovarian cyclicity on the day of ovulation if followed by regular ovarian cycles. Thirty seven percent (n=20/54) of the cows had normal resumption of ovarian cyclicity (resumption within 45 days after calving), and 63% (n=34/54) had delayed resumption (resumption did not occur until >45 days after calving). Delayed resumption Type I (one or more ovarian cycles with luteal phase >20 days, i.e. prolonged luteal phase; 31.5%) and delayed resumption Type II (first ovulation did not occur until > or =45 days after calving, i.e. delayed first ovulation; 24.1%) were the most common types of delayed resumptions. Almost half (46.3%) of the cows did not resume their ovarian cyclicity until >65 days postpartum. Cows with delayed resumption Type I had a higher incidence of abnormal cervico-vaginal discharge (64.7%) and incomplete uterine involution (94.1%) compared to cows with normal resumption (P<0.01). The BCS of cows with delayed resumption Type II were lower than those of normal resumption cows at 5 weeks and later in the postpartum period (P<0.05). Approximately two-thirds of high-producing cows had delayed resumption of ovarian cyclicity postpartum. Prolonged luteal phase and delayed first ovulation were two important ovarian dysfunctions that delayed postpartum resumption of cyclicity in high-producing dairy cows.
Authors:
Hemanta Kumar Shrestha; Toshihiko Nakao; Tsuneo Higaki; Toshihiko Suzuki; Masashi Akita
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Theriogenology     Volume:  61     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2004 Feb 
Date Detail:
Created Date:  2003-12-30     Completed Date:  2004-03-19     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  637-49     Citation Subset:  IM    
Affiliation:
Animal Science Laboratory, Graduate School for International Development and Cooperation (IDEC), Hiroshima University, 1-5-1 Kagamiyama, Higashi-Hiroshima 739-8529, Japan.
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MeSH Terms
Descriptor/Qualifier:
Animals
Body Composition
Body Weight
Cattle / physiology*
Enzyme-Linked Immunosorbent Assay
Estrous Cycle*
Female
Japan
Lactation*
Milk / chemistry
Ovulation*
Postpartum Period*
Progesterone / analysis
Reproduction
Time Factors
Chemical
Reg. No./Substance:
57-83-0/Progesterone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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