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

Kyung-Il Sung,Seok-Man Hong,Jalil Ghassemi Nejad,Do-Hyeon Ji,Byong-Wan Kim,Bae-Hun Lee,Sang-Jip Ohh,Jing-Lun Peng

doi:10.1186/s40781-015-0043-7

Kyung-Il Sung, Seok-Man Hong + Show 6 more

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https://doi.org/10.1186/s40781-015-0043-7

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Abstract

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

Highlights

Chromium is known to be partially liable in blood cholesterol regulation
The experiment was continued by investigating the effects of forage level and Cr-Met on carcass characteristics and blood metabolites in the 2nd fattening period (23-30 month age for Hanwoo) of Korean beef steers
Upon completion of the 1st fattening period, the steers with average body weights of 480 ± 37.6 kg were randomly assigned to four treatment groups: LF (40 F plus no added Cr-Met in the 2nd fattening period), LFCM (40 F plus added 400 ppb of Cr-Met in the 2nd fattening period), HF (60 F plus no added Cr-Met during the 2nd fattening period) and HFCM (60 F plus added 400 ppb of Cr-Met in the 2nd fattening period)

Summary

Introduction

Chromium is known to be partially liable in blood cholesterol regulation. Chromium-Met chelate absorbs directly through the intestinal cell membrane in an intact form [1]. Availability of Cr-Met chelate remains high [2]. Chromium is an essential trace mineral that has a principal role in glucose, protein and fat metabolisms in animal tissues [3]. Organic forms of chromium, such as yeast culture containing high Cr concentration, are usually more absorbable than inorganic forms [8]. Other organic forms of chromium, such as chromium propionate or chromium-methionine, have shown consistent positive effects on glucose metabolism, feed intake, and milk production in dairy cattle compared with other chromium compounds [9,10,11]

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