Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Relationship between Resumption of Postpartum Ovarian Cyclicity and Plasma Urea Nitrogen (PUN) in Holstein Cows

젖소의 분만 후 난소 주기의 재개와 혈장 요소태 질소(PUN)와의 관계

  • Park, S.B. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Son, J.K. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Park, S.J. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Baek, K.S. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Jeon, B.S. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Ahn, B.S. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Kim, H.S. (Dairy Cattle Research Division, National Livestock Research Institute, RDA) ;
  • Park, C.K. (College of Animal Life Sciences, Kangwon National University)
  • 박수봉 (농촌진흥청 축산연구소 낙농과) ;
  • 손준규 (농촌진흥청 축산연구소 낙농과) ;
  • 박성재 (농촌진흥청 축산연구소 낙농과) ;
  • 백광수 (농촌진흥청 축산연구소 낙농과) ;
  • 전병순 (농촌진흥청 축산연구소 낙농과) ;
  • 안병석 (농촌진흥청 축산연구소 낙농과) ;
  • 김현섭 (농촌진흥청 축산연구소 낙농과) ;
  • 박춘근 (강원대학교 동물생명과학대학)
  • Published : 2006.09.30
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Abstract

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 ${\ge}40days$ 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, $15{\sim}19.9\;and\;{\ge}20mg/dl$ had the likelihood ratios of normal ovarian cyclicity of 0.9, 1.14 and 0.55, respectively. Thus, PUN concentration of $15{\sim}19.9mg/dl$ had a favorable association with postpartum resumption of cyclicity, whereas lower or higher PUN had a negative association with postpartum resumption of cyclicity.

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 주기의 재개 지연 II형(22.7%)이 난소 주기 재개 지연의 일반적인 형태였다. 공시우의 18%(35/194)는 분만 후 60일이 경과되어도 난소 주기가 재개되지 않았다. 황체기의 연장과 첫 배란의 지연이 분만 후 난소 주기 재개를 지연시키는 대표적인 난소 이상이다. PUN의 농도가 <15, $15{\sim}19.9$와 ${\ge}20mg/dl$인 소들의 정상적 난소 주기 재개의 likelihood ratios는 각각 0.9, 1.74와 0.55이었다. $15{\sim}19.9mg/dl$의 PUN 농도가 난소 주기의 재개에 가장 좋았고, 높거나 낮은 PUN 농도는 난소 주기의 재개에 나쁜 관계가 있음을 보여주었다.

Keywords

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