Abstract
Effects of fats having different fatty acid distribution to 2-position of glycerol and of calcium contents in diets on digestion and absorption of lipids, individual fatty acids, calcium, magnesium, phosphorus and protein were studied by weaning rats.
Absorbability of lipids was affected by calcium contents in diets, but there was no difference in absorbability between human milk fat and cow's milk fat at the same calcium level. Absorbability of coconut oil was the highest.
At high calcium level, palmitic and stearic acids of fats in which palmitic or stearic acid was distributed more preferably to 2-position of glycerol were better absorbed except for coconut oil. But this relationship was not distinct at medium calcium level.
Lipids excretion of individual rats fed on fat free diet was different each other, but was not affected by calcium level.
Absorbability of calcium was low at high calcium level and was higher in fat free diet than in fat containing diets, and among fat containing diets was low in cow's milk fat and interesterified lard oil diets, especially at high calcium level. Quantity of calcium absorbed itself increased at high calcium level.
Absorbability of magnesium, phosphorus and protein were also affected by calcium level in diet and were lower at higher calcium level.
Calcium and magnesium excreted in feces were fairly equivalent to salt form fatty acid and phosphorus excreted in feces, supposing that at high calcium level almost all phosphorus take the form HPO42- and that at medium calcium level almost all phosphorus take the form HPO42- and H2PO4-.
During growth absorbability of calcium was most apparently changed and that of palmitic and stearic acids was also changed.
