Studies in Milk Secretion. 



83 



tered on grass and her record does not appear in our list because 

 no just comparison can be made as to the amount of dry matter 

 consumed which is the basis of this comparison. Numbers 190 

 and 202 refer to the same cow, Mutual Friend 3d, she being 

 tested in two successive years. On her last test she consumed 

 the least amount of food for one pound of fat that has been re- 

 quired by any cow of any age whose record is given in this bul- 

 letin. It will be remembered under F that No. 187 required the 

 least dr}' matter for 100 pounds of milk and one pound of fat of 

 any cow not on an " Economic Food Test." This is only a little 

 more food for a pound of fat than was required by No. 202, and 

 the former was not entered for a food test, but it was intended 

 to give her all the food she could well handle. This is well 

 shown in tabular form below. 



Mutual Friend 3d 



( On Economic Food Test 

 Helena Burke j 58 



(Cow requiring least dry 

 matter for j lb. product) 

 Mutual Friend 2d 



(Cow consuming most dry 

 matter per day. ) 

 Average for all cows not at 



pasture 



On the food test, the only two-year old entered required 16.53 

 pounds of dry matter for one pound of fat. This is a little more 

 than was required by the three- and four-year olds, numbers 99 

 and 133 respectivel3% and only a little less than by No. 59 of the 

 two-year olds. Neither of the three last named were entered on 

 food tests. The cow requiring the most dry matter for one 

 pound of fat among those entered for food tests is No. 201, with 

 18.79 pounds. It will be noticed, however, that she consumed 



