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홀스타인 젖소의 생시체중과 분만난이도와의 상관관계 KCI 등재

Correlation among Calf Birth Weight, Calving Difficulty and Gestation Length in a Korean Holstein Dairy Cattle Herd

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

The objective of this study was to identify the phenotypic relationships among calving difficulty, calf birth weight and gestation length of Holstein dairy cattle under the environment of Korea. A total of 1,834 calving records collected by Dairy Science Division of National Institute of Animal Science, RDA from 2000 to 2014 was analyzed. General linear multivariate models for calving difficulty scores (CD: 1=no assistance, 2=minor assistance, 3=two to three persons assisted, 4=more than three persons assisted, 5=cesarean section), calf body weight at birth (BW), and gestation length (GL) included fixed effects of year and season (spring, summer, autumn, winter) of births (YS), sex of calves, and parity. For GL and BW, all three fixed effects (YS, sex of calves, parity) were significant (p<0.05). For CD, the effects of YS and sex of calves were significant (p<0.05). Bull calves were born with heavier BW by 3.18 kg, with greater CD by 0.18 point and with longer GL by 0.6 days than heifer calves. The least squares mean of BW was the heaviest at the third parity (44.1 kg) compared to those at the first, the second and the fourth parities or later (41.3-41.9 kg). The least squares mean CD at the first parity was 1.74 point, which was higher than CD at the second and later parities (about 1.68 points). Phenotypic correlation (partial residual correlation) between GL and BW was 0.36. But those between GL and CD and between BW and CD were -0.03 and 0.04, almost zeros. To conclude, we observed higher incidence of calving difficulty in the first calving than in the later ones. Further investigation on the relationships between calf’s birth weight and calving difficulty is needed

저자
  • 최연호(농촌진흥청 국립축산과학원) | Yun Ho Choy Corresponding author
  • 원정일(농촌진흥청 국립축산과학원) | Jeong Il Won
  • 윤호백(농촌진흥청 국립축산과학원) | Ho Baek Yoon
  • 조광현(농촌진흥청 국립축산과학원) | Kwang Hyun Cho
  • Alam Mahboob(농촌진흥청 국립축산과학원)
  • 조충일(농촌진흥청 국립축산과학원) | ChungIl Cho
  • 연성흠(농촌진흥청 국립축산과학원) | Seong Heum Yeon
  • 박병호(농촌진흥청 국립축산과학원) | Byoungho Park
  • 양보석(농촌진흥청 국립축산과학원) | Bohsuk Yang