Growth Curve Characteristics of Bull and Steer of Hanwoo(Korean Cattle)

한우 거세 및 비거세우의 성장곡선 특성

  • Kim, N.S. (Dept. of Animal Science, Chungbuk Natl. Univ.) ;
  • Ju, J.C. (Dept. of Animal Husbandry, Yonam College of Agriculture) ;
  • Song, M.K. (Dept. of Animal Science, Chungbuk Natl. Univ.) ;
  • Chung, C.S. (Dept. of Animal Science, Chungbuk Natl. Univ.) ;
  • Choi, Y.I. (Dept. of Animal Science, Chungbuk Natl. Univ.) ;
  • Park, C.J. (Korean Native caattle Improvement Center)
  • Published : 2002.10.31


Body weight-age data from 60 bulls and 60 steer of Hanwoo in the Korean Native Cattle Improvement Center was used to determine the growth curve parameters with Gompertz equation. Estimated growth curve functions were as follows; Bul l : $W_t$ = 906.1.exp{-3.956.exp(-0.0034t)} Steer : $W_t$ = 823.1.exp{-3.301.exp(-0.0027t} Mature weight estimated with Gompertz equation of bull is higher than earlier studies. And the major factor raising differences from the other is feeding level. Relative body weights of steer to bull were rapidly decreased to 79.2% until 19.5 months of age, and then increased slowly. The ratio was 90.8% at mature state. Body weight was under-estimated for bull at birth, but over-estimated for steer, and the body weight variations of bull were larger than the steer.


Growth curve;Gompertz equation;Hanwoo;Korean cattle


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