Food Science of Animal Resources (한국축산식품학회지)

Korean Society for Food Science of Animal Resources (한국축산식품학회)
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Changes of Physicochemical Properties of Conjugated Linoleic Acid(CLA) Accumulated Pork during Storage Time

Conjugated Linoleic Acid(CLA)가 축적된 돈육의 저장기간중 이화학적 특성변화

  • 이정일 (경상남도 첨단양돈연구소) ;
  • 정재두 (경상남도 첨단양돈연구소) ;
  • 이진우 (경상남도 첨단양돈연구소) ;
  • 이제룡 (경상남도 첨단양돈연구소) ;
  • 정진연 (경상대학교 축산과학부) ;
  • 양한술 (경상대학교 축산과학부) ;
  • 주선태 (경상대학교 축산과학부)
  • Published : 2003.09.01
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Abstract

To investigate the effects of dietary conjugated linoleic acid 011 changes of physicochemical properties of pork. Twenty pigs were divided into 5 treatment groups and subjected to each experimental diet(0, 1.25% and 2.5% CLA for 2 weeks, 1.25% and 2.5% CLA for 4 weeks, as total fed diet before slaughtering(about 110 kg). Pork loin samples were aerobically packed and stored for 14 days at 4$^{\circ}C$. Samples were then analyzed for general compositions, physicochemical characteristics and sensory evaluation. pH value of CLA fed group pork was significantly increased than that of control group(p<0.05). Crude fat content of CLA treated group pork was significantly higher than the control pork(p<0.05), but there were no significant differences in crude protein, crude ash and total moisture contents between control and CLA treated groups. AU CLA fed group pork showed higher WHC value than control pork. Drip loss was significantly lower compared to those of control porks. No significant differences in lean meat and fat color(CIE L*, a*, b*) were observed between control and the CLA treated group porks. Meanwhile, CLA pork tended to be lower in content of total heme pigment compared to control pork. No remarkable differences were found in sensory properties(color and drip loss) among control and CLA diet-fed group porks. Marbling score and acceptability were significantly increased in CLA diet-fed pork compared to the control pork.

Conjugated linoleic acid(CLA)를 비육돈에 급여하여 비육돈체조직내에 CLA를 축적시키고, CLA가 축적된 돈육의 품질 특성에 대한 연구를 수행하였다. 대조구는 80∼110 kg 까지는 일반사료회사에서 생산하는 사료를 급여하였으며, 처리구 1은 출하(출하체중: 110 kg) 2주전부터 일반사료회사에서 생산하는 사료에 CLA를 1.25% 첨가하여 급여하였으며, 처리구2는 출하 2주전부터 사료함량에 CLA를 2.5% 첨가하여 급여하였다. 처리구 3은 사료함량에 1.25% CLA를 첨가하여 4주간 급여하였으며, 처리구 4는 2.5% CLA를 4주간 급여하였다. 급여기간이 끝난 후 일괄적으로 함양도축장에서 도축하여 돈육의 등심부위를 함기포장하여 냉장온도(4'E)에서 14일간 저장하면서 각 실험항목을 조사하였다 저장기간에 따른 돈육등심의 일반성분, 이화학적 특성 및 관능평가등을조사하여 CLA가 축적된 돈육의 저장기간에 따른 품질특성을 규명하고자 하였다. pH변화를 보면 전 저장기간동안 대조구에 비하여 CLA 급여 처리구가 유의적으로 높은 pH를 보여(p<0.05) CLA 급여가 PH 변화에 영향을 미치는 것으로 나타났다. 저장기간에 따른 pH 변화에서 모든 처리구가 저장기간이 경과함에 따라 pH가 증가하는 경향을 보였다. CLA급여 수준과 급여기간이 등심근내 조지방 함량에는 유의적인 영향을 미치는 것으로 나타났으며(p<0.05), 대조구와 CLA 급여처리구간에는 대조구에 비하여 CLA급여 처리구가 높은 조지방 함량을 보였다(p<0.05). 보수성은 대조구에 비하여 CLA 급여 처리구가 높은 경향을 보였다. 저장 초기에는 대조구에 비하여 CLA 급여 처리구가 유의적으로(p<0.05) 낮은 육즙손실을 보였으며, 모든 처리구가 저장기간이 경과함에 따라 육즙손실이 유의적으로 감소하는 경향을 보였다. CLA 급여수준과 급여기간이 육색과 총육색소 함량에는 영향을 미치지 않는 것으로 나타났다. 관능적 특성평가 중 육색과 육즙참출은 대조구와 비교하여 CLA급여 처리구가 유의적인 차이가 없었으나, 근내지방 축적 정도와 전체적인 기호성은 대조구에 비하여 CLA 급여 처리구가 유의적으로 높은 평가를 받았다(p<0.05).

Keywords

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