422 ANIMAL BIOCHEMISTRY 



An estrogenic compound in Ladino clover has been identified 

 (coumesterol). These compounds are dissimilar in structure to 

 estrone (page 322). Whether they act as direct substitutes or 

 function through the stimulation of estrone production in the 

 animal has not been determined. 



ELEMENTS 



The elements essential for animal growth arc .iscussed in Chapter 

 15. Most of these elements are adequately supplied in normal dietary 

 components. Commercial mineral supplements are available, some- 

 times admixed with vitamins, at reasonable cost. Other preparations 

 are often sold as cure-alls for Bang's disease (contagious abortion) 

 and other animal diseases. There is no evidence to support such 

 claims. The practice of feeding minerals in quantities beyond the 

 requirements of the animal enriches only the mineral salesman. 



REFERENCES 



Feeds and Feeding, twenty-second edition. F. B. Morrison. Morrison Publishing Co., 

 Ithaca, N. Y., 1956. 



Applied Animal Nutrition. E. W. Crampton. W. H. Freeman and Co., San Fran- 

 cisco, 1956. 



Antibiotics in Nutrition. H. Jukes. Medical Encyclopedia, Inc., New York, 1955. 



Animal Nutrition, fourth edtion. L. A. Maynard and J. K. Loosli. McGraw-Hill 

 Book Co., New York, 1956. 



