| Autor: |
Crampton, E.W., Farmer, Florence A., McKirdy, Helen B., Lloyd, L.E., Donefer, E., Schad, Donna J. |
| Zdroj: |
The Journal of Nutrition; October 1960, Vol. 72 Issue: 2 p177-184, 8p |
| Abstrakt: |
During each of the years 1957–′58–′59 biscuits and/or muffins were prepared from a dry mixture that when eaten in amounts daily to meet energy needs furnished the nutrients called for in the Canadian Dietary Standard. They were prepared from the same recipe each year and formed the sole diet during 4- (or 5-) day periods for 103 senior university students at Macdonald College. A statistical study using methods of covariance and partial regression was made of voluntary food intake, and of the coefficients of apparent digestibility of dry matter, energy (calories), crude protein, ether extract, and of carbohydrate by difference. The range of voluntary caloric intake varied from as low as 25 to as high as 175% of the computed daily maintenance needs; but neither sex, weight of subject, nor diet intake, relative to computed maintenance requirement significantly affected the coefficients of apparent digestibility for any of the above 5 diet components. Weight of subject and level of diet intake together accounted for (i.e., R2) only about 7% of the variability in the digestibility coefficients, and of this insignificant total the relative beta values indicated that 90% was traceable to the varying amounts eaten. It was shown that digestible energy, determined by bomb calorimeter combustion of food and of feces, could be converted directly to metabolizable energy by deducting from the digestible calories per 100 gm of diet, one Calorie for each percentage unit of crude protein in the dry matter of the diet. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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