The Korean native cattle, Hanwoo, is the most popular breed of beef cattle in Korea. However, the reproductive performance data are limited although reproduction is one of the most economically and biologically important in beef production. Therefore, this study was undertaken to investigate reproductive performance parameters including calving interval, parity for life time production. Data collected from 206,827 calvings were analyzed. There were no significant differences in calving interval and gestation days as parity increased from 2nd and 13rd parity cow, from spring to winter. However, we found a dramatic increase in calving interval after year 2000. About 1 month were increased per year ( y = 30.578x + 344.45 R² = 0.9157). Interestingly, we observed that parities for life time can be affected by birth weight. Calves with 23 kg at birth showed highest parities, 3.4±2.0 times. In summary, this study provides valuable data on reproductive performance of Hanwoo and the data presented here can be used as a standard target for optimising and enhancing reproductive performance.

서 론
  1. 조사 자료 수집
  2. 자료 정의 및 분류
  3. 통계분석
 결 과
  1. 한우 암소의 산차 분포 및 산차별 번식능력
  2. 한우 암소의 년도별 분만간격 추이
  3. 한우의 번식 성적과 계절성
  4. 생시체중이 생애 산차 및 분만간격에 미치는 영향
 고 찰
 적 요
 REFERENCES

• 조재성(충남대학교 농업생명과학대학 동물자원과학부) | Jaesung Cho
• 도창희(충남대학교 농업생명과학대학 동물자원과학부) | Changhee Do
• 최인철(충남대학교 농업생명과학대학 동물자원과학부) | Inchul Choi Correspondence