거세한우 비육후기 농후사료 에너지 수준이 육질 및 경제성에 미치는 영향
Effects of Energy Level of Concentrate Feed on Meat Quality and Economic Evaluation in Finishing Hanwoo Steers
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참고문헌
초록
비육후기 거세한우 50두를 사료의 에너지 수준에 따라 2개 처리구(TDN 72구:농후사료의 TDN 함량 72%구, TDN 74구:농후사료의 TDN 함량 74%구)를 두어 6개월간 비육시험한 결과를 요약하면 다음과 같다. 24개월령 체중은 TDN 72구에 비해 TDN 74구에서 약간 증가되는 경향을 보였고. 일당증체량은 TDN 72구에 비해 TDN 74구에서 4.4% 개선되는 경향이었다. 1kg 증체 당 농후사료, 건물 및 TDN 요구량은 처리간에 차이를 보이지 않았으며, 비록 통계적인 유의성은 인정되지 않았으나, 1kg 증체 당 조단백질 요구량의 경우 TDN 72구에 비해 TDN 74구에서 6.4% 개선되는 경향을 보였다. 도체율은 TDN 72구에 비해 TDN 74구가 통계적인 유의성은 인정되지 않았으나 개선되는 경향을 보였으며, 거래정육율은 TDN 72구에 비해 TDN 74구에서 체지방 비율의 증가로 인해 감소되는 경향을 보였다. 육질특성 중 근내지방도, 육색 및 지방색의 처리구간 차이는 없었고, 육량특성 중 도체중, 배최장근단면적 및 등지방 두께도 처리구간 차이도 없어 육질 및 육량 등급의 차이도 없는 것으로 나타났다. 등심의 전단력, 가열감량 및 보수력의 경우 처리구간에 차이를 보이지 않았으며, 등심의 수분 및 조단백질 함량의 경우에도 처리구간에 차이를 보이지 않았고, 비록 통계적인 유의성은 인정되지 않았으나 TDN 72구에 비해 TDN 74구에서 등심의 조지방 함량이 다소 감소되는 경향을 보였다. 다즙성 및 향미는 통계적인 유의성은 인정되지 않았으나 TDN 72구에 비해 TDN 74구에서 개선되는 경향을 보였고, 특히, 연도의 경우 TDN 72구에 비해 TDN 74구에서 7.4% 개선되었다(p<0.05). 경제성에서 TDN 72구에 비해 TDN 74는 도체 판매가격이 높고 소득도 높아 TDN 72구에 비해 TDN 74구에서 경제성이 높은 경향을 보였다.
Abstract
This study was conducted to evaluate the effects of energy level of concentrate feed in finishing Hanwoo steers for 6 months before slaughter. Feeding trial was done with 2 treatment groups, TDN72 (72% of TDN in concentrate) and TDN74 (74% of TDN in concentrate). The body weight (from 19 to 24 months) tended to be higher in TDN74 than in TDN72, but was not significant. Average daily gain of TDN74 was higher by 4.4% in comparison to TDN72. There was no significant differences in concentrate, dry matter and TDN intake per 1kg body weight gain between TDN72 and TDN74. And there was a tendency to improve crude protein intake per 1kg body weight gain by increasing TDN content from 72 to 74%. The dressing percentage tended to be higher in TDN74 than in TDN72, but was not significant. Salable meat percentage tended to be lower in TDN74 than in TDN72 because of higher body fat percentage in TDN74 than in TDN72. There were no significant differences in marbling score, meat color, fat color, carcass weight, ribeye area and back fat thickness between TDN72 and TDN74. Significant differences were not found in shear value, cooking loss, water holding capacity or moisture and protein contents of longissimus dorsi (LD) muscles between TDN72 and TDN74. Fat content of LD muscles tend to be lower in TDN74 than in TDN72 but without any significance. There was a tendency to improve juiciness and taste by feeding TDN74 rather than TDN72. Especially, tenderness of TDN74 was increased by 7.4% in comparison to TDN72 (p<0.05). Gross income from TDN74 was higher than TDN72 by 5%. The results suggested that significant differences were not found in growth performance, feed conversion and carcass characteristics between TDN72 and TDN74. The results also show that more studies are required to clarify the energy level for finishing Hanwoo steers.
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