UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 613 
Contribution from the States Relations Service 
A. C. TRUE, Director 
Washington, D. C. 
PROFESSIONAL PAPER 
April 25, 1919 
DIGESTIBILITY OF CERTAIN MISCELLANEOUS 
ANIMAL FATS/ 
By Arthur D. Holmes, Specialist in Charge of Digestion Experiments, Office 
of Home Economics. 
~ 
CONTENTS. 
Page. 
Introduction 1 
Methods of procedure 2 
Subjects 3 
Goat's butter 3 
Kid fat 6 
Hard-palate fat 8 
Horse fat 10 
Oleooil 12 
Oleo stearin 15 
Ox-marrow fat 17 
Ox-tail fat 19 
Turtle fat , 22 
Summary 24 
INTRODUCTION. 
Earlier papers 2 of this series have reported the coefficients of 
digestibility of lard, beef and mutton fats, and butter; cream, 
chicken, goose, egg-yolk, brisket and fish fats; olive, cottonseed, 
peanut, coconut and sesame oils and cocoa butter; almond, black- 
walnut, Brazil nut, butternut, English walnut, hickory nut, and 
pecan oils; corn, soy-bean, sunflower-seed, Japanese mustard-seed, 
rapeseed and charlock-seed oils. The present paper deals with the 
digestibility of goat's butter, kid fat, hard-palate fat, horse fat, oleo 
oil, oleo stearin, ox -marrow, ox-tail, and turtle fats. Though oleo oil 
and oleo stearin are of much importance commercially, the fats dis- 
cussed in this bulletin, as a whole, are not commonly known in 
American homes. However, they are, for one reason or another, of 
interest in considering culinary and table fats as well as in the con- 
sideration of general problems related to the use of fats as food. A 
few of these ±ats were purchased in the open market and the re- 
mainder were secured through the cooperation of Government and 
commercial activities. The hard-palate, horse, kid, and turtle fats 
were rendered in the laboratory by cutting the unrendered fat very 
fine, heating in a double boiler until the fat was completely melted, 
and then straining through rather thick cloth. The oleo oil, oleo 
1 Prepared under the direction of C. F. Langworthy, Chief, Office of Home Economics. 
a See list of bulletins on page 26. 
95191°— 19— Bull. 613 1 
