2 MAINE AGRICULTURAL EXPERIMENT STATION. 



■ I. The; Study and Analysis of Milk Records. 

 During the past year the work in this direction has fallen 

 into three chief divisions: viz., (a) The preparation for the 

 press of the results of the extended study of the relation of 

 milk flow to age in dairy cattle; (b) The preparation of a 

 Dairy Efficiency Table; (c) the transfer and analysis of the 

 Eiltmore herd records. 



(a) RELATION OF MILK FLOW TO AGE IN DAIRY CATTLE. 



The main essential results of this investigation were in 

 hand at the time of the last annual report. It has been pos- 

 sible to demonstrate in the most complete manner from exten- 

 sive data on the three breeds, Jersey, Holstein-Friesian, and 

 Ayrshire, that the change in milk-flow as a cow grows older 

 follows a definite law, expressible in the form of a mathemati- 

 cal equation. A preliminary statement of this law has been 

 published." 



The preparation of this material for printing has been a very 

 laborious and time-consuming task. It is now hoped that 

 within a few m.onths following this report the complete manu- 

 script will be ready for the printer. In connection with the 

 preparation of this material for the press a number of inter- 

 esting subsidiary matters 'have come to light. One may be 

 briefly considered here. It has to do with a 



Comparison of American Advanced Registry Ayrshires 



zuith Ayrshires in Scotland in Respect of 



Milk Production. 



As set forth in our last report, the records furnished by the 

 Scottish Milk Records Societv have been the basis of our studv 

 of Ayrshire milk production. These records, it will be re- 

 called, correspond to American cow-test association records 

 in this particular that the records of all cows in each herd 

 good, bad, and indifferent, are included. During this past year 

 we have been able, through the kindness of Dr. J. A. Ness, 

 President of the Ayrshire Breeders' Association, and Mr. C. M. 



'Pearl, R. On the Law Relating Milk Flow to Age in Dairy CatVie. 

 Proc. Soc. Exper. Biol, and Med., Vol. XII, pp. 18-19, 1914. 



