Effects of Rumen-Protected Methionine and Lysine or IGF-I Supplementation on Growth Performance and Carcass Characteristics of Hanwoo Steers

초록

This study aimed to investigate the effects of rumen-protected methionine and lysine (RPML) or insulin-like growth factor I (IGF-I) supplementation on the growth performance, plasma metabolite, and carcass characteristics of Hanwoo steers. Thirty-nine steers (264.4 ± 60.7 kg, period : 11 ~ 28 months) were randomly assigned to the following groups: control group fed a basal diet (formula feed + rice straw), T1 group fed a basal diet + RPML, and T2 group fed a basal diet + IGF-Ⅰ. The average daily gain (ADG) was slightly, but not significantly, higher in the T1 and T2 groups than in the control group. The concentrations of plasma metabolites were similar between the treatments. The carcass weight and marbling score tended to be higher in the T1 and T2 groups than in the control group, and the rib eye area was wider in the T2 group than in the control and T1 groups (p<0.01). RPML or IGF-I supplementation did not affect back fat thickness, meat color, or texture of Hanwoo steers. Thus, RPML or IGF-I supplementation had slightly positive effects on ADG, marbling score, and rib eye area. In particular, IGF-I supplementation had a positive effect on the rib eye area in Hanwoo steers.

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