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젖소에서 산유량이 분만 후 건강과 번식 능력에 미치는 영향
Effects of Milk Yield on the Postpartum Health and Reproductive Performance of Dairy Cows 원문보기

Journal of veterinary clinics = 한국임상수의학회지, v.30 no.3, 2013년, pp.178 - 185  

김상곤 (충북대학교 수의과대학) ,  정재관 (충북대학교 수의과대학) ,  허태영 (국립축산과학원) ,  강현구 (충북대학교 수의과대학) ,  김일화 (충북대학교 수의과대학)

초록
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본 연구는 젖소에서 산유량이 분만 후 건강과 번식 능력에 미치는 영향에 대하여 조사하였다. 젖소 목장 6개소의 총 1,060두로부터 산유 성적, 신체충실지수(BCS), 분만 후 질병 및 번식 능력에 대한 자료를 수집하였으며, 모든 자료는 305일 산유량에 기준으로 대조군(< 10,000 kg, n = 445)과 고산유량군(${\geq}$ 10,000 kg, n = 615)으로 구분하였다. 유지방, 유단백 및 BCS는 분만 후 5개월 동안 대조군에 비해 고산유량군에서 낮았다(p < 0.01). 자궁내막염 발생은 대조군(35.1%)에 비해 고산유량군(29.6%)에서 낮은 경향이 있었으나(p = 0.06), 난소낭종의 발생은 대조군(15.3%)에 비해 고산유량군(28.6%)에서 증가되었다(p < 0.0001). 번식 호르몬 처리를 받은 소의 비율은 대조군(56.6%)에 비해 고산유량군(62.4%)이 높은 경향을 보였으나(p = 0.06), 첫 수정 수태율은 대조군(35.2%)에 비해 고산유량군(30.2%)에서 낮은 경향을 나타내었다(odds ratio = 0.78, p = 0.07). 분만 후 210일까지 임신율은 대조군에 비해 고산유량군에서 낮았으며(hazard ratio = 0.84, p = 0.04), 이것이 분만 후 평균 임신 간격의 연장(20일)을 초래하였다. 결론적으로, 젖소에서 고산유량은 유지방, 유단백질 및 BCS의 저하, 난소낭종의 발생 증가 및 번식 호르몬의 사용 증가로 번식 능력의 감소를 초래하였다.

Abstract AI-Helper 아이콘AI-Helper

This study evaluated the effects of milk yield on the postpartum health and reproductive performance of dairy cows. In total, data were collected from 1,060 cows on six dairy farms, including their milk production, body condition score (BCS), postpartum disorders, and reproductive performance. The l...

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제안 방법

  • Ovsynch was used, which combined the GnRH analogue gonadorelin (Fertagyl, MSD AH Korea, Seoul, Korea) on day 0 (initiation of the Ovsynch), PGF2α on day 7, and the GnRH analogue on day 9, with or without the insertion of an internal drug-release device containing 1.9 g of progesterone (CIDRTM, InterAg, Hamilton, New Zealand) between days 0 and 7.
  • The Cox models included farm, group, cow parity, calving season, and postpartum disorders (retained placenta, metabolic disorders, endometritis, and ovarian cysts). The proportional hazard rate was evaluated based on the interactions between the explanatory variables and time, and by evaluating the Kaplan-Meier curves. The median and mean days to first insemination or pregnancy were determined by a survival analysis based on the Kaplan-Meier model using the LIFETEST procedure in SAS.

대상 데이터

  • Data were collected from 1,060 lactating cows on six dairy farms. These data included detailed information on milk production and composition, health, and reproduction.
  • In total, 1060 Holstein dairy cows (331 primiparous and 729 multiparous; mean parity = 2.6 ± 0.1) were enrolled in this study.
  • This study was conducted in six Holstein dairy farms (AF) in Chungcheong. In total, 1060 Holstein dairy cows (331 primiparous and 729 multiparous; mean parity = 2.

데이터처리

  • Backward stepwise regression was used in all models and elimination was performed based on the Wald statistic criterion when p > 0.11.
  • The occurrence of postpartum disorders (retained placenta, metabolic disorders, endometritis, and ovarian cysts), the percentage of cows that received reproductive hormones, and the culling rate were compared using a Chi-squared test. The mean number of hormonal treatments per cow was compared using an ANOVA test. Cox’s proportional hazard model with the PHREG procedure in SAS was used to analyze the hazard of first insemination by 150 DIM and the hazard of pregnancy by 210 DIM for cows in the ≥ 10,000 kg and < 10,000 kg classes.
  • The milk contents (fat and protein) and BCS during 5 months postpartum were compared using a repeated measures ANOVA in SAS (SAS version 9.1; SAS Inst. Inc., Cary, NC, USA). The occurrence of postpartum disorders (retained placenta, metabolic disorders, endometritis, and ovarian cysts), the percentage of cows that received reproductive hormones, and the culling rate were compared using a Chi-squared test.
  • The probability of the first insemination conception was analyzed by logistic regression using the LOGISTIC procedure in SAS. The logistic regression model for the initial insemination pregnancy rate included farm, group, cow parity, calving season, and postpartum disorders.

이론/모형

  • The proportional hazard rate was evaluated based on the interactions between the explanatory variables and time, and by evaluating the Kaplan-Meier curves. The median and mean days to first insemination or pregnancy were determined by a survival analysis based on the Kaplan-Meier model using the LIFETEST procedure in SAS. A survival plot was generated using the survival option in MedCalc version 11.
  • , Cary, NC, USA). The occurrence of postpartum disorders (retained placenta, metabolic disorders, endometritis, and ovarian cysts), the percentage of cows that received reproductive hormones, and the culling rate were compared using a Chi-squared test. The mean number of hormonal treatments per cow was compared using an ANOVA test.
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