잠분(蠶糞) 급여가 돈육 등심의 화학적 조성에 미치는 영향
Effect of Dietary Silkworm Droppings on Chemical Composition of Pork Loin
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잠분은 건조상태(수분 10% 내외)의 잠분을 급여하였다. 대조구는 출하시까지(110kg) 일반사료를 급여, 처리구 1, 2, 3은 사료 함량에 잠분을 각각 1, 2, 3% 첨가하여 4주간 급여하였고, 처리구 4, 5, 6은 1, 2, 3%로 각각 첨가하되 8주간 급여하였다. 급여시험이 끝난 후 일괄적으로 도축하여 돈육의 등심부위를 함기포장하여 냉장온도(4℃)에서 12일간 저장하면서 돈육의 화학적 조성 변화에 대하여 조사하였다. 지방산화는 대조구와 잠분 급여 처리구간에 유의적인 차이가 없는 것으로 나타났으며, 저장기간이 경과함에 따라 모든 처리구가 유의적으로 증가하였다(P<0.05). 총 myoglobin 함량은 잠분 급여 처리구가 유의적으로 높은 함량을 보였다(P<0.05). 관능검사 중 마블링 점수와 전체적인 기호성은 대조구에 비하여 잠분 급여 처리구가 높은 평가를 받았다(P<0.05). 무기물 중 Na, Mg, Ca, Mn 및 Fe 함량은 대조구에 비하여 잠분 급여 처리구가 유의적으로 낮은 함량을 보였다(P<0.05). 반면에 P 함량은 대조구에 비하여 잠분 급여 처리구가 유의적으로 높은 함량을 보였다(P<0.05). 잠분 급여로 아미노산 함량에 많은 영향을 미쳤는데, aspartic acid, serine, tyrosine 함량은 감소하는 반면에 glutamic acid, alanine, isoleucine 함량은 증가하는 경향을 보였다. 잠분 급여수준과 급여기간이 증가할수록 stearic acid 함량은 유의적으로 감소하였으며, 반면에 oleic acid 함량은 유의적으로 증가하였다(P<0.05). 포화지방산 함량은 잠분 급여수준과 급여기간이 증가할수록 유의적으로 감소하였고, 불포화지방산 함량은 유의적으로 증가하였다(P<0.05).
Abstract
This study investigated the effects of silkworm droppings(SWD) added diet feeding on chemical composition of pork loin meat. Pigs were divided into 7 treatment groups(10 pigs/group) and subjected to one of seven treatment diets(0, 1%, 2%, 3% SWD for 4 weeks, 1%, 2%, 3% SWD for 8 weeks, SWD diets; total fed diets) before slaughter. Pork loin were collected from the animals(110kg body weight) slaughtered at a commercial slaughter house. Pork loin meat were aerobic packaged and then stored at 4℃ for 2, 5, 8, or 12 days. Samples were analyzed for TBARS, sensory evaluation, myoglobin content, fatty acid composition, amino acid and mineral content. TBARS value was not significantly different between the control and SWD treatment groups. Myoglobin content of SWD fed group pork was significantly increased than that of control group(P<0.05). Marbling score and acceptability were increased in SWD fed pork compared to those in control pork. Na, Mg, Ca, Mn and Fe content of SWD fed group pork was significantly decreased than those of control group(P<0.05). P content was significantly increased than that of control group(P<0.05). In the change of amino acid composition, the contents of aspartic acid, serine and tyrosine were decreased by dietary SWD-supplementation, whereas the SWD-supplementation resulted in the higher glutamic acid, alanine and isoleucine. As dietary SWD was increased in feed, the content of oleic acid was significantly increased, but stearic acid was significantly decreased(P<0.05).
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