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식이구성 성분에 따른 흰쥐의 열량대사 연구

식이구성 성분에 따른 흰쥐의 열량대사 연구
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(The) effect of dietary composition on energy metabolism in growing rats
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대학원 식품영양학과
이화여자대학교 대학원
This study was designed to investigate the effects of various food combination on energy metabolism. Forty male and same number of female rats weighing approximately 125g were divided into 5 dietary groups: Control, CI, FA, CO, MO groups representing diets of Laboratories, City, Farm, Coastal area, Mountainous area, respectively. The main protein sources in each diet were as follows; casein for Control, combination of meat and fish for CI, soy for FA and MO, fish for CO group. Rats were fed each diet, ad libitum, for 15 days. Energy efficiency was significantly in Control, CI, CO groups than in FA, MO groups. There were no significant differences in feed intakes and in gross, digestible and metabolizable energy among experimental diet groups and sexes. But the fecal energy content was the highest in MO group and the Lowest in Control group. Thus the efficiency of rate of energy absorption was decreased in order of Control, CI, CO, FA, MO group. The metabolizable energy seemed to be not much differ from digestible energy for each groups, since there were no significant differences in urinary N excretion among the groups, and the urinary N was very slight excreted. Weight gain and food efficiency were significantly higher in animal protein groups (Control, CI, CO) than in plant protein groups (FA, HO). No difference were found in protein, fat, energy contents of empty carcass among the groups and between sexes. The weights of liver and epididymal fat pad were higher in Control, CI, CO groups compared with FA, MO groups. There was no significant difference in serum lipid content and protein concentration among experimental groups. However, there was a tendency of higher HDL proportion in FA, MO groups compared with Control, CI, CO groups and in female compared with in male. There were no significant difference in hepatic glycogen, protein and cholesterol contents among experimental groups and between sexes. But there were a tendency of higher Lipid and TG concentration in liver of the rats in FA, MO groups. In conclusion, since there was lower growth rate and lower energy efficiency rate with plant protein diet, it would be desireable to supplement animal protein food to diet, especially for diets in Farming, Mountainous areas.;본 연구는 성장기의 흰쥐에게 열량영양소 비율 및 급원식품을 달리하여 급여시켰을때 열량효율 및 체내대사에 미치는 영향을 조사하였다. 평균체중이 125g 정도인 흰쥐 암 수 각각 40마리를 크게 단백질급원이 동물성식품인 표준군 (Control group), 도시형식이군(Cl group), 어촌형 식이군 (CO group)과 식물성식품인 농촌형 (FA group), 산촌형식이군(MO group)의 5가지 식이군으로 나누어 15일동안 자유섭취법(adlibitum feeding method)으로 섭취시켰다. 식이 및 열량섭취량은 식이의 종류 및 동물의 성에 따른 차이가 없었으나 증체량은 Control ,CI, CO군이 FA, MO군보단 높았고 수컷이 암컷보다 높은 경향이었다. 따라서 열량효율도 Control, CI, CO군이 높았다. 섭취한 gross energy, digestible energy, metabolizable energy은 실험식이 및 성에 따른 차이는 없었으나 fecal energy배설량은 MO군이 가장 높고 Control군이 가장 낮아 열량 소화흡수율도 Control, CI, CO, FA, MO군의 순을 보여주었다. 그러나 urine으로의 energy배설량은 실험군간에 차이가 없었으므로 열량이용율은 흡수율과 같은 경향이었다. Empty carcass의 단백질, 지방, 열량함량은 실험식이 및 성에 따른 차이가 없었다. 그러나 체중, 간, epididymal fat pad의 무게는 Control, CI, CO군이 FA, MO군보다 높았으며 성에 따른 차이는 증체량과 같은 경향이었다. 혈청내 단백질 및 지방함량은 차이가 없었으나 lipoprotein구성 비율은 FA, MO군이 HDL percentage가 Control, CI, CO군보다 높았으며 암컷이 수컷보다 높은 경향이었다. 간내 glycogen 및 단백질, cholesterol함량은 실험식이 및 성에 따른 차이가 없었으며 총지방 및 triglyceride함량은 FA, MO군이 Control, CI, CO군보다 높았다. 그러나 성에 따른 차이는 보이지 않았다. 결론적으로 본 연구에서는 실험식이가 식물성식품만으로 구성되었을때는 성장 및 열량이용율의 저하를 보여 주었으므로 농촌 및 산촌식이에 동물성식품 첨가 문제를 고려하여 앞으로 식품급원에 따른 열량대사에 대한 연구가 더 많이 필요하다고 생각된다.
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