Effects of forage level and chromium-methionine chelate supplementation on performance, carcass characteristics and blood metabolites in Korean native (Hanwoo) steers

초록

A feeding trial was carried out to determine the effects of chromium methionine (Cr-Met) chelate and forage levelover two years, 1st fattening and 2nd fattening period on growth parameters, carcass characteristics and bloodmetabolites of 46 Korean native (Hanwoo, Bos Taurus, BW = 183 ± 44 kg) steers. Treatments were: 1) Steers in thelow forage (LF) group were fed diets that consisted of 60% concentrate and 40% forage; 2) Steers in the highforage (HF) group were fed diets that consisted of 40% concentrate and 60% forage. Following the 1st fatteningperiod, steers (BW = 480 ± 37.6 kg) were randomly assigned to four treatment groups: LF (40 F plus no Cr-Metsupplementation in the 2nd fattening period), LFCM (40LF plus added 400 ppb of Cr-Met during the 2nd fatteningperiod), HF (60 F plus no added Cr-Met during the 2nd fattening period) and HFCM (60 F plus added 400 ppb ofCr-Met in the 2nd fattening period). Dry matter intake of the treatment diets did not differ during the raising and1th fattening period (P > 0.05). The ADG in the raising period showed no difference between the 40 F and 60 Fgroups (P > 0.05). Carcass characteristics including rib-eye area and meat yield index were higher in HF than theother treatment groups (P < 0.05). The HF group tended to show a higher (P = 0.08) marbling score than the LFgroup whereas the HFCM group showed a higher marbling score than the LFCM group (P < 0.05). HDL washigher and LDL lower in groups fed with Cr-Met than in other groups whereas glucose showed the lowest valuein HF group (P < 0.05). Triglyceride (TG), Cholesterol, PUN and total protein (TP) were the same among all treatmentgroups (P > 0.05). The Insulin concentration in the blood was significantly higher for the HFCM group than for the LF,LFCM and HF groups (P < 0.05). It is concluded that supplementation of chromium-methionine chelate could improvemeat quality in beef steers.

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