338 



EXPERIMENT STATION RECORD. 



"The data were obtained from 99 cows in all, and tliose of single 

 determination from 5S cows. The average determinations of the milk 

 from the different herds have been calcnlated, and ^vere as follows : 

 Summary of examination of fat globules. 



Number 

 of cows. 



Relative 

 size. 



Average 



diameter 



of jjlob- 



ules. 



Breed test Xo. :2 {90-day butter test) ; examinations 

 made Aug.26-W. 



Jersey 



Guernsey 



Shorthorn • 



290 

 217 

 177 



0. 00395 

 . 00358 

 . 00335 



Average 



Breed test No. 3 (30-day butter test) ; examinations 

 made Aug. 30-Sept. 2 and Hept. 35-^8. 



Jersey 



Guernsey • 



Shorthorn 



Average 



Breed test Xo. 4 (heifer test) ; examinations made 

 Oct. 1-4. 



Jersey ■ 



Shorthorn 



Average 



Average for all breeds and tests . 



142 

 121 

 132 



66 



107 



. 00363 



144 



164 

 162 



1.56 



80 



337 

 267 

 214 



. 00415 

 . 00384 

 . 00357 



309 

 504 



. 00403 

 . 00479 



, 00391 



"Twelve new cows were included in the test No. 3, and the number on the test 

 decreased to 15 cows from each herd. In tests Nos. 2 and 3 the average size of the 

 globules in the milk from the different herds was largest with the .Jerseys, the 

 Guernseys couiing next, and the Shorthorns last. In the heifer test, on the other 

 hand, the Shorthorns had the larger average globules, in spite of the fact that they 

 were 41 days further advanced in the period of lactation than the Jersey heifers, 

 which would naturally bring a diminution in the size of the globules. The aA'er- 

 age results for all herds and tests were 157 globules in 0.0001 cmm. and a relative 

 size of 289, corresponding to an average diameter of 0.00391 mm., the results having 

 been obtained with cows 128 days in milk." 



Attention is called to the case of a Shorthorn cow apparently in good 

 health, whose milk contained only 19 globules per 0.0001 cmm., the 

 average relative size being 1982, i. e., the average diameter of the glob- 

 ules was 0.00749 mm. 



"If Ave calculate the average data of the determinations of the globules in the 

 milk for the individual cows, considering the quality of milk produced by eacli ani- 

 mal in each case, Ave have the following statement : " 



Average number and size of globules in milk of different breeds. 



Breed test Xo. 3. 



Herd milk (average of Aug. 30-Sept. 2 

 and Sept. 25-28) 



Average for milk from single coavs 

 (average of examinations made Aug. 

 30-Sepl. 23) 



Breed test Xo. 4. 



Herd milk (average Oct. 1-4) 



Average for milk from single cow 

 (Oct. 1-4) 



