MAINE AGRICULTURAL EXPERIMENT STATION. 3 



Winslow, Secretary, to compare the American Advanced 'Reg- 

 istry Ayrshire records with these Scottish records. The re- 

 sults of such comparison, in part, are shown in Table i. 



TABLE I. 



Comparing Mean Weekly Yields (in Gallons) of (a) American 



Advanced Registry, and (b) Scottish Milk Record 



Society Ayrshire Cows. 



Age of Cow. 



American 

 Advanced 

 Registry. 



Scottish Milk 

 Records Society. 



Difference. 



Two years 



14.84± .08 

 16.76± .14 

 17.47=fc .14 

 20.32± .13 



13.61 ± .18 1.23 

 13.84 ± .04 2.92 



Four years 



' ' Mature " 



15.23 ± .06 

 18.56 ± .093 



2.24 

 1.76 







SThis figure is for 9-year-old cows. 



From this table it will be seen that the American Advanced 

 Registry Ayrshires outyield their Scottish sisters, on the aver- 

 age, from about one and a quarter gallons to three gallons per 

 week, or roughly from lo to 25 pounds. Looked at from a 

 relative standpoint it appears that the American Advanced 

 Registry animals give, as two year old heifers or as mature 

 cows, about 9 per cent, on the average more milk than the 

 Scottish herds. For the three year and four year ages the per- 

 centage is higher. 



The standards for admission to advanced registry are just 

 as high for the Ayrshire as for any other breed. It appears a 

 fair question as to whether a standard which runs less than 10 

 per cent, above the general average of the breed for mature 

 cows is sufficiently high to get the best results in the direction 

 of breed improvement. 



(b) A DAIRY EI^FICIE:NCY TABLE. 



. The following kind of question constantly arises in cow- 

 test association work: Herd X is made up of cows of various 

 ages from 2 to 14 years, the majority of the cows being fully 

 matured (6 years or over). These cows last freshened at 



