STUDIES ON FATS, OILS, AND FATTY ACIDS 217 



Table 10 



Average Coefficients of Digestibility of Different Animal Fats and Oils Fed 



to Human Subjects" 



Av. Coeff. 



Number of daily fat of 



Fat or oil expts. intake, g. digestibility 



Bacon 6 289 96 . 7 



Beef (ni.p., 45°C.) C 10 100 93 



Brisket* 7 80 97.4 



Butter 6 8 100 97 



Butter' — 214 97 



Chicken* 8 95 96.7 



Cod-liver/ 4 47 97.7 



Cream* 7 78 96.9 



Egg yolk* 6 83 93.8 



Fish* 3 60 95.2 



Goat's butter' 4 45 98.4 



Goose* 7 95 95.2 



Hard palate (m.p., 34°C. )" 3 90 93 . 7 



Horse" 3 65 93.9 



Kid" ' 3 62 95.3 



Lard e 9 90 97 



Oleo" 8 59 96.8 



Ox marrow" 4 87 93 . 5 



Oxtail" 3 77 96.6 



Turtle" 4 49 98.6 



° H. J. Deuel, Jr., in K. S. Marklev, ed., Soybeans and Soybean Products, Vol. II, Inter- 

 science, New York-London, 1951. 



6 K. Blunt and M. G. Mallon, J. Biol, ('hem.., 38, 43-48 (1919). 



' C. F. Langworthy and A. D. Holmes, U. S. Dept. Agr., Bull. No. 810, 1-20 (1915). 



* C. F. Langworthv and A. D. Holmes, U. S. Dept. Aqr., Bull. No. 507, 1-19 (1917). 



« M. Buhner, Z. Biol., 15, 115-202 (1879); cited by It. P. Cook, Comparative Aspects 

 of Lipid Absorption and Excretion, in R. T. Williams, Lipid Metabolism, Biochem. Soc. 

 Symposia, No. 9, Cambridge Univ. Press, 14-29 (1952), p. 15. 



i H. J. Deuel, Jr., and A. D. Holmes, U. S. Dept. Agr., Bull. No. 1083, 1-15 (1922). 



" A. D. Holmes, U. S. Dept. Agr., Bull. No. 613, 1-27 (1919). 



with the exception of avocado fat (87.8) and teaseed oil, for which the 

 result of a single test gave a coefficient of digestibility of 91.2. All of 

 the eighteen animal fats studied had coefficients of digestibility of 93 or 

 better. 



The results of the tests reviewed by Langworthy 60 may be open to 

 some question, in view of the fact that the method employed for the 

 determination of fecal lipids accounts for only neutral fat, fatty acid, 

 and non-saponifiable components, but does not include soaps. It is 

 well known that soaps may comprise a considerable proportion of the 

 stools, especially in the case of subjects on high calcium diets and when 

 abnormalities in fat absorption obtain. Holmes and Kerr 61 recognize 

 this as a possible criticism of the U.S.D.A. work. However, when the 



* l A. D. Holmes and R, H. Kerr, J. Biol. Chem., 58, 377-381 (1923-1924). 



