454 



EXPERIMENT STATION RECORD. 



produced by the cows in the Mustiahi College herd has been ascer- 

 tained since 1885, and also the food eaten by the cattle. The cream 

 content of each cow's milk was determined daring 1889-'91, inclusive, 

 once a week by means of Fjord's control centrifuge. The average per- 

 centages of cream ' for the various breeds for the 3 years are given in 

 the following table. The author compares the relative economy of the 

 different breeds on the basis of units of concentrated feed consumed 

 (3 lbs. of hay considered equal to 1 lb. of concentrated feed). The 

 average data for the various breeds during 1885-81) is as follows: 



Cream in 7nilk of different breeds. 



Breed. 



Holsteiu 

 Ayr.sliire 

 Angler . . 

 Native . . 



Concen- 

 trated 

 feed per 

 100 lbs 

 of milk. 



Units 

 About 32 

 A bout 37 

 About 35 

 About 45 



a Approximate. 



The food consumed during tlie 3 years mentioned, as well as the milk 

 produced by the various breeds, is given in the following summary: 



Summary of food consumed per year per head and products obtained 1889-91, 



Breed. 



Holatein . 

 Ayrshire 

 Angler . . 

 Native . . 



Average 

 number 



of C0W8. 



Approxi- 

 mate 

 quanti- 

 ties of hay 

 eaten. 



Pounds. 

 3,530 

 3,248 

 3,178 

 2,826 



Concen- 

 trated 

 feeds. 



Pounds. 

 1,305 

 1,021 

 1, 023 



Milk pro- 

 duced per 

 year 



Pounds. 

 6,513 

 5, 125 

 5,035 

 4,093 



.Concen- ] Concen- 

 trated feeds trated feed.s 

 per 100 lbs.' per pound 

 of milk. of fat 



Units. 

 7.7 

 6.8 

 8.1 

 8.4 



The/at content of mi Uc from Holstein coirs. — The determinations were 

 made weekly during 1889-'91, by means of a lactocrite, and an account 

 kejit of the quantity of milk produced and the food consumed. The 

 average percentage of fat in the milk of all the Holstein cows during 

 1889-'91, arranged by months, was as follows: January, 3.09; February, 

 2.94; March, 2.79; April, 2.89; May, 2.98; June, 3.19; July, 3.53; 

 August, 3.G5; September, 3.15; October, 3.23; November, 3.10; and 

 December, 3.01. The average fat content of the milk from the indi- 

 vidual cows during these years varied from 2.69 to 3.79 per cent; the 

 annual milk production varied from 4,210 to 7,977 lbs.; the production 

 of fat from 127.9 to 251 lbs.; and the number of units of concentrated 

 feed from 887 to 1,302. 



'One pel* cent of cream, as found by Fjord's test, corresiiouds very nearly to 0.6 

 per cent fat. 



