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KMID : 0438219750120030649
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Korea University Medical Journal
1975 Volume.12 No. 3 p.649 ~ p.664
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A Study on Nutritional Effects of Dietary Fat Owing to Different Source and Level in Rats
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Abstract
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In order to observe the nutritional effects of the experimental diets supplemented with fats on different source and level in rats, body weight gained, protein efficiency rate, and absorption rates of protein, fat, - carbohydrate, calcium and phosphorus in the experimental diets have been measured.
Albino rats, 90 heads, weighing 80g to 95g, male were maintained with stock diet for two weeks and they were used as the experimental animals. The animals were divided in to 9 groups depend on the feeding diets and period.
The experimental diets used were 5 kinds for this study as follows: 1. Standard diet, 2 High fat diets containing-tallow or rape oil, 3. Low fat diets containing tallow or rape oil. The protein contents of each diet were controlled with casein to simillar level, 15.59-16.29 per 1008 of diet, and fats level of the high fats diet was 20% where as the low fat diet was 5%, and the metabolic energy value in 1,00g of each diet were 398 kcal in control diet, 457-458 kcal in high fats diets, and 370-373 kcal in low fats diets.
In the feeding period each diet, the control, the high fats, and the low fats diet groups were maintained with corresponding diet through out whole experimental periods, and exchanging diet groups were alternately exchanged with high fat diet and low fat diet by every 4 weeks for 8 weeks.
The results obtained are summarized as follows,
1. The body weight gained in the group of diet supplemented with tallow was increased more than that of diet group with rape oil, while that of the low fats diet group was higher than that of the high fats diet group.
2 Although the body weight gained of the-animals maintained with the-low fats diet after feeding of the high "tats diet for 4 weeks were increased more than that of animals with -the high fats diet alone, but it couldn´t reach to the level of the control group.
3 -The protein efficiency ratios of -the diet group exchanged with high ´fats aB 4ow fats diet by
every 4 weeks were better than that of non-exchanging diet group.
4. The protein absorption rate of each diet group was similar each other, but nitrogen retention effect in group of the high fats diet containing rape oil was lower than that of the other diet groups,
5 The fats absorption rate in group of the high fats diet supplemented with tallow was gradually increased where as in group of high fats diet containing rape oil was gradually decreased.
6 The calcium retention of the high fats diet group during early 6 weeks were lower than that of the control group, and the tendency of decreasing was eminent in the high rape group.
7. The phosphorus absorption rate was not significantly differed among each diet oil groups.
In view of these results, it would be emphasized that the protein utilization in rats fed by exchangeing the high fats diet and the low fats diet was better than that of non-exchanged feeding one, and the nutritional effect on the rat was better in the diet group with the tallow than the rape oil.
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KEYWORD
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