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Effects of Feeding Patterns and Sexes on Growth Rate, Carcass Trait and Grade in Korean Native Cattle

  • Choi, B.H. (Department of Animal Science, Institute of Biotechnology, Chonnam National University) ;
  • Ahn, B.J. (Department of Animal Science, Institute of Biotechnology, Chonnam National University) ;
  • Kook, K. (Department of Animal Science, Institute of Biotechnology, Chonnam National University) ;
  • Sun, S.S. (Department of Animal Science, Institute of Biotechnology, Chonnam National University) ;
  • Myung, K.H. (Department of Animal Science, Institute of Biotechnology, Chonnam National University) ;
  • Moon, S.J. (Department of Animal Science, Institute of Biotechnology, Chonnam National University) ;
  • Kim, J.H. (Department of Animal Science, Institute of Biotechnology, Chonnam National University)
  • Received : 2001.10.25
  • Accepted : 2002.01.25
  • Published : 2002.06.01

Abstract

The objectives of this study were to examine growth performance and meat quality by three different feeding patterns in Korean native cattle (KNC). In each of 3 years, fifteen KNC were randomly assigned in a (3 feeding management)${\times}$(3 sex) factorial design experiment; thus, in total, there were 5 animals in each of the 9 treatments. The three feeding management treatments were longterm (24 month) restriction feeding (LTFR), long-term restriction feeding-hormone implant (LTFR-tH), and short-term (18 month) nonrestriction feeding (STFNR). Three sexes were bull, steer, and heifer. Concentrate diet was fed restriction-feeding method based on body weight in LTFR and LTFR-tH. However, the diet was fed ad libitum in STFNR. Hormonal implantation was made three times with M-$PO^{TM}$ for bulls and with F-$TO^{TM}$ for heifers at 18, 20, 22 month of age in LTFR-tH. Animal were purchased from the local cattle market and managed in two local farms and at the university research unit. Animals were slaughtered at 24 months for long-term trial and at 18 month for short-term trial. The growth rate was the highest in bulls and the lowest in heifers. However, the differences were diminished in F-$TO^{TM}$ implanted heifers. The average daily gain was high in STFNR due to ad libitum feeding. The carcass grade was similar among the treatments on percentage bases. Hormonal implants improved significantly the meat quality grade in all sexes. Castration increased body fat content and improved meat quality grade by intramuscular fat deposition. In conclusion, long-term feeding and hormone treatment increased meat quality grade more than short-term feeding. However, ADG was higher in the short-term trial although feedefficiency was lower.

Keywords

Growth Rate;Carcass Grade;Feeding Pattern;Korean Native Cattle

Acknowledgement

Supported by : the Agriculture and Forestry Science Foundation, Academic Research of Chonnam National University

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