논문 상세보기
pp.199-205
본 연구는 젖소의 분만 후 난소 주기의 재개, 난소 주기 재개와 PUN과의 관계를 구명하기 위해 수행하였다. 정상적인 난소 주기가 진행이 되면 배란된 날에 난소 주기가 재개된 것으로 간주하였다. 공시우의 58.8%(l14/194)가 정상적인 난소 주기의 재개를 하였고 41.2%의 소에서 난소 주기의 재개가 지연되었다. 배란 후 황체기가 20일 이상 유지되는 난소 주기의 재개지연 I형(17.5%)과 분만 후 40일 이전에 첫 배란이 나타나지 않는 난소 주
The objective of this study was to investigate the resumption of postpartum ovarian cyclicity, and to determine the relationship between concentrations of plasma urea nitrogen (PUN) and resumption of ovarian cyclicity in Holstein cows. The cows were considered to have resumed ovarian cyclicity on the day of ovulation, if followed by regular ovarian cycles. 58.8 percentage of the cows (114/194) had normal resumption of ovarian cyclicity (resumption within 40days after calving), and 41.2% (80/194) had delayed resumption (resumption did not occur until> 40days after calving). Delayed resumption Type I (one or more ovarian cycles with luteal phase> 20days, i.e. prolonged luteal phase; 17.5%) and delayed resumption Type II (first ovulation did not occur until after calving, i.e. delayed first ovulation 22.7%) were the most common types of delayed resumption. 18 percentage of the cows (35/194) did not resume their ovarian cyclicity until 60days postpartum. Prolonged luteal phase and delayed first ovulation were two important ovarian dysfunctions that delayed postpartum resumption of cyclicity in dairy cows. Cows with PUN of <15, had the likelihood ratios of normal ovarian cyclicity of 0.9, 1.14 and 0.55, respectively. Thus, PUN concentration of had a favorable association with postpartum resumption of cyclicity, whereas lower or higher PUN had a negative association with postpartum resumption of cyclicity.
