MASSACHUSETTS 

 AGRICULTURAL EXPERIMENT STATION 



Bulletin No. 357 March 1939 



The Effect of Feeding 



a Vitamin A Supplement to 



Dairy Cattle 



By J, G. Archibald and C. H. Parsons 



The role of vitamins in the diet of man and animals has become a matter of 

 vital and practical interest. This bulletin reports the results of a two-year study 

 of the effect of vitamin A used as a supplement to natural dairy rations. 



MASSACHUSETTS STATE COLLEGE 

 AMHERST, MASS. 



