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Effect of Age at the First Pregnancy on Calving Status in Holstein Heifers

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동물자원연구 (Annals of Animal Resources Sciences)
강원대학교 동물자원공동연구소 (Institute of Animal Resources Kangwon National University)
초록

Raising replacement heifers is important aspect of dairy farm management that can be characterized as a long-term performance and high-cost production period. This study was investigated the effect of month of age at the first pregnancy on calving difficulty of Holstein heifers. Heifers was inseminated with semen of easy-calving sire and the reproductive performance was compared for the effect of first pregnancy at 12-14 months of age (12 month old), 15-16 months of age (15 month old), 17-19 months of age (17 month old) and > 20 months of age (20 month old) in Holstein heifers. Holstein heifers showed different easy calving score (ECS) depending on their ages; frequency of ECS 1 was 55.2%, 64.9%, 59.4% and 52.0% at 12, 15, 17 and 20 month of age, respectively. Frequency of ECS 4 was 5.2%, 1.8%, 6.3% and 4.8% at 12, 15, 17 and 20 month of age, respectively. The rates of retained placenta postparturition in first pregnancy age category was 12.3% at 12 months of age, 5.3% at 15 months of age, 9.4% at 17 months of age and 19.0% at 20 months of age. When It was evaluated by present results, the reproductive performance like easy calving score (ECS), retained placenta rates, and abortion and stillbirth rates of heifers which was inseminated at 14 months old or less and at 17 months old or more was reduced. Therefore, the first pregnancy age for optimum reproductive performance was 15-16 months.

저자
  • 백광수(농촌진흥청 국립축산과학원) | Kwang-Soo Baek Corresponding author
  • 윤현상(한국종축개량협회) | Hyun-Sang Yoon
  • 이왕식(제주대학교 생명공학부) | Wang-Shik Lee
  • 안현숙(농촌진흥청 국립축산과학원) | Hyun-Sook Ahn
  • 김원호(농촌진흥청 국립축산과학원) | Won-Ho Kim
  • 채현석(농촌진흥청 국립축산과학원) | Hyun-Seok Chae
  • 김남영(농촌진흥청 국립축산과학원) | Nam-Young Kim
  • 조인철(농촌진흥청 국립축산과학원) | In-Chul Cho