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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

Abstract

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.

농협 한우 개량부에서 시험 사육한 거세우 및 비거세우 각각 60두의 자료를 근거로 곰페르츠 방정식에 의한 성장곡선을 추정한 결과 비거세우의 성장곡선 방정식은 $W_t$ = 906.1.exp{-3.956.exp(-0.0034t)}이었으며, 거세우의 성장곡선 방정식은 $W_t$ = 823.1.exp{-3.301.exp(-0.0027t}이었다. 이 추정식에 의한 성숙체중은 과거에 추정한 식보다 높게 추정되었는데 이는 사양조건의 차이에 의한 것으로 사료된다. 비거세우에 대한 거세우의 체중비는 19.5개월까지는 급격히 감소하여 79.2% 정도에 이르렀으나, 이후 격차는 서서히 줄어들어 성숙시에는 90.8%에 이르렀다. 추정식은 생시 체중이 거세우의 경우 과다하게 그리고 비거세우의 경우 과소하게 추정되었으며, 실제 체중의 변이는 비거세우가 거세우에 비해 큰 경향을 보였다.

Keywords

References

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  1. Estimation of Growth Curve Parameters for Evaluation of Withers Height Growth Characteristics of Holstein Heifers in Republic of Korea vol.52, pp.4, 2018, https://doi.org/10.14397/jals.2018.52.4.73