γ-aminobutyric acid의 첨가가 비육기 거세한우의 성장특성, 혈액성상 및 도체특성에 미치는 영향
Effects of γ-aminobutyric Acids Supplementation on Growth Performance, Blood Profile and Carcass Characteristics of Fattening Hanwoo Steers
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γ-aminobutyric acids는 천연 스트레스 저감제로 알려져 왔으며, 인간용 건강보조제로서 활발하게 이용되고 있다. 하지만 축우에 대한 이용에 대한 연구는 거의 없는 실정이다. 본 연구는 GABA의 첨가가 비육기 거세한우의 성장특성, 혈구성상, 혈중 대사물질 및 도체특성에 미치는 영향에 대해 조사하기 위해 수행되었다. 21두의 비육기 거세한우를 공시하여 대조구(기초사료 : 배합사료+볏짚), T1구(기초사료+배합사료 급여량의 0.8% 수준의 GABA 첨가제) 및 T2구(기초사료+배합사료 급여량의 1.6% 수준의 GABA 첨가제)의 3처리로 완전 임의배치하였다. 사료섭취량 및 사료요구율은 처리구간 차이가 없었지만, 비육전기의 일당증체량은 대조구에서 0.80kg, T1에서 0.86kg, T2에서 0.92kg 으로 GABA의 급여에 따라 선형적으로 증가되었다(p<0.05). 혈장 γ-glutamyl transferase (37.5, 58.2, 42.8U/ℓ) 및 creatinine(1.32, 1.34, 1.49㎎/㎗) 농도가 GABA 급여구에서 대조구에 비해 증가되었다(p<0.05). 거세한우의 도체중(422.7, 427.1, 454.1kg), 등심단면적(86.67, 92.57, 91.14cm2) 및 근내지방도(3.67, 4.29, 4.14)는 GABA 첨가에 따라 증가하는 경향을 보였지만, 통계적인 유의성은 인정되지 않았다. 따라서 GABA 첨가는 일당증체량과 도체특성의 개선에 긍정적인 영향이 있는 것으로 판단된다. 하지만 GABA의 첨가비율에 따른 효과는 적은 것으로 판단되며, 추후 반추위 코팅기술을 활용한 GABA관련 연구가 필요할 것으로 생각된다.
Abstract
γ-aminobutyric acid (GABA) is a natural stress-reducing substance and is actively used as a human health supplement. However, minimal research has been conducted on its use in cattle. This study was conducted to evaluate the effects of GABA on the growth performance, complete blood count, blood metabolites, and carcass characteristics of fattening Hanwoo steers. Twenty-one fattening steers were randomly assigned to one of three treatments: control (basal diet: concentrate feed + rice straw), T1 (basal diet + GABA supplement at 0.8% of feed/head/day), and T2 (basal diet + GABA supplement at 1.6% of feed/head/day). Feed intake and conversion ratio did not differ among the treatments. However, the average daily gain during the early fattening period increased linearly to 0.80 kg, 0.86 kg, and 0.92 kg in the control, T1, and T2 groups (p<0.05). Plasma γ-glutamyl transferase (37.5, 58.2, 42.8 U/ℓ) and creatinine (1.32, 1.34, 1.49 ㎎/㎗) levels in the GABA supplement group were increased compared to those in the control group. The carcass weight (422.7, 427.1, 454.1 kg), rib eye area (86.67, 92.57, 91.14 cm2), and marbling score (3.67, 4.29, 4.14) were numerically higher in the GABA supplement group than in the control group. Thus, GABA supplementation positively affected the average daily gain and carcass characteristics of Hanwoo steers. However, the effect of the GABA supplement level of GABA was small, and further research using rumen-protected coating technology on GABA is necessary.
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