Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Effect of Age at First Calving on Productive and Reproductive Performance in Dairy Cattle

  • Sung, Mu-Kyung (College of Veterinary Medicine, Chungbuk National University) ;
  • Lee, Soo-Chan (College of Veterinary Medicine, Chungbuk National University) ;
  • Jeong, Jae-Kwan (College of Veterinary Medicine, Chungbuk National University) ;
  • Choi, In-Soo (College of Veterinary Medicine, Chungbuk National University) ;
  • Moon, Sung-Ho (College of Veterinary Medicine, Chungbuk National University) ;
  • Kang, Hyun-Gu (College of Veterinary Medicine, Chungbuk National University) ;
  • Kim, Ill-Hwa (College of Veterinary Medicine, Chungbuk National University)
  • Received : 2016.01.25
  • Accepted : 2016.02.20
  • Published : 2016.04.30
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Abstract

This retrospective study evaluated the effect of age at first calving on the productive and reproductive performance in Holstein dairy cattle. Data were collected on 2,297 lactations from 19 dairy farms, including dates of birth, insemination, pregnancy, calving, and lactation and milk production (305-day milk yield at first lactation and lifetime milk yield). Lactation data were grouped based on age at first calving into the early (< 24 months, n = 414), moderate (24 ${\leq}$ and ${\leq}$ 28 months, n = 1,268), and late (> 28 months, n = 615) groups. The 305-day milk yield at first lactation was higher (p < 0.005) in the late group (8,461.9 kg) than in the early (8,130.8 kg) and moderate (8,261.9 kg) groups. Lifetime days in milk were shorter (p < 0.01) in the early group (1,045.7) than in the moderate (1,143.1) and late (1,110.7) groups, whereas the lifetime milk yield was higher (p < 0.05) in the moderate group (34,171.8 kg) than in the early group (31,791.6 kg). The second calving interval (days) differed (p < 0.0001) between the early (416.9), moderate (438.9), and late (455.3) groups. The culling rate at the first and second lactations tended to be higher (p = 0.08) in the early group (31.2%) than in the moderate group (26.0%), whereas it was intermediate in the late group (29.3%). In conclusion, dairy heifers aged 24-28 months at first calving showed a higher productive performance through an increased lifetime milk yield and a decreased culling rate.

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References

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