Resumption of postpartum ovarian cyclicity in high-producing Holstein cows

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 progesteron...

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Bibliographic Details
Published in:Theriogenology 2004-02, Vol.61 (4), p.637-649
Main Authors: Kumar Shrestha, Hemanta, Nakao, Toshihiko, Higaki, Tsuneo, Suzuki, Toshihiko, Akita, Masashi
Format: Article
Language:English
Subjects:
Animals
Body Composition
Body Weight
Cattle - physiology
corpus luteum
Dairy cows
Enzyme-Linked Immunosorbent Assay
Estrous Cycle
Female
Japan
Lactation
Milk - chemistry
Ovarian cyclicity
Ovulation
Postpartum
postpartum interval
Postpartum Period
Progesterone - analysis
Progesterone ELISA
Reproduction
subtropics
Time Factors
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Summary: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 ≥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
ISSN:0093-691X
1879-3231
DOI:10.1016/S0093-691X(03)00233-4