한우 거세우의 TMR사양에서 비육후기 농후사료 첨가가 사양성적, 도체특성 및 등심의 이화학적 특성과 관능평가에 미치는 영향
Effects of Supplemental Concentrate During the Late Fattening Phase on Performance, Carcass Characteristics, Biochemical Composition and Sensory Test of Loin in TMR Feeding of Korean Steers
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본 연구는 한우 TMR사양에서 비육후기 동안 농후사료를 첨가하였을 때, 사양성적과 도체특성, 배최장근의 물리·화학적 특성 및 관능평가에 미치는 영향을 조사하기 위하여 수행되었다. 한우거세우 8두(24개월령, 평균체중 604kg)를 TMR구(Control)와 TMR에 배합사료 추가구(TMR+ conc.)에 각각 배치하여 출하 시(30개월령)까지 사양한 후, 도축하였다. 배합사료 추가구가 대조구에 비해 건물과 TDN섭취량 및 도체중과 근내지방도는 유의적(p<0.05)으로 높았으나, 도체등급에서는 차이가 없었다(p>0.05). 배최장근 아미노산 조성은 처리간 차이는 없었으며, glutamic acid 함량이 가장 높았고, cystine함량이 가장 낮았다. 필수아미노산 중에는 lysine, leucine, threonine, arginine, isoleucine 순으로 높았다. 배최장근 지방산 중에서 cis- oleic acid와 arachidonic acid 함량은 대조구가 배합사료 추가구보다 유의적(p<0.05)으로 높았으며, oleic acid, palmitic acid, stearic acid 순으로 높았고, 이들 지방산이 전체 지방산의 약 88%를 차지하고 있었다. 배최장근의 물리, 화학적 특성과 관능평가에서는 처리에 따른 유의적 차이는 없었으나(p>0.05), 대조구의 결과가 대체로 우수한 편이었다. 이상의 결과들로 볼 때, 한우거세우에게 비육후기 동안 농후사료를 추가 급여하면 도체중과 근내지방도는 증가되나, 배최장근내 cis-oleic acid함량이 줄어들어 육류 관능평가에서는 부정적인 효과를 나타낼 수 있을 것으로 사료된다.
Abstract
This study was conducted to investigate the effects by supplementing concentrates during the late fattening phase in TMR (total mixed ration) feeding of Korean steer on the performance, carcass traits, physico-chemical characteristics and sensory test of the longissimus dorsi muscle. Eight Korean steers (24 months of age) averaging 604 kg in body weight were fed the TMR (Control) or the TMR supplemented with concentrates (TMR+conc.) until 30 months of age, then they were slaughtered. Steers fed the TMR supplemented with concentrates had a higher (p<0.05) intakes of dry matter and TDN (total digestible nutrient), carcass weight and marbling score compared to those fed TMR only, but carcass grade did not differ (p>0.05) between treatments. Amino acid concentration of the longissimus dorsi muscle did not differ between treatments, However, the highest concentrations were for glutamic acid and lowest for cystine; further, and the content of essential amino acids was highest for lysine, leucine, threonine, arginine, and isoleucine in that order. Cis-oleic acid and arachidonic acid of fatty acids in the longissimus dorsi muscle were higher (p<0.05) in the control condition compared to TMR+conc. The contents of oleic acids, palmitic acid, stearic acid constituted about 88% of the total fatty acids. Although the physico-chemical characteristics of the longissimus dorsi muscle did not significantly differ between treatments (p>0.05), but the sensory test results were lower for the TMR+conc. condition. These results suggest that supplementing concentrates during the late fattening phase of Korean steers resulted in increasing the carcass weight and marbling score. However, the cis-oleic acid content of the longissimus dorsi muscle was decreased as a result of supplementing concentrates, which could affect negatively in meat sensory evaluation.
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