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. 1 



By Abthtjb D. Holmes, Specialist in Charge of Digestion Experiments, Office 



of Home Economics. 



CONTENTS. 



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 fats 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. 

 8 See list of bulletins on page 26. 

 95191°— 19— Bull. 613 1 



