70 



MANUAL OF MILK PRODUCTS 



fat globule was surrounded by a membrane, but this theory 

 has been almost abandoned at the present time. 



SIZE AND NUMBER OF FAT GLOBULES 



The size and number of fat globules in milk may vary widely 

 in different samples. The factors which seem to influence the 

 size and number of the globules are the breed, the age, and the 

 stage in the period of lactation. 

 Influence of breed. 



Woll 1 made extended studies on the size and number of fat 

 globules in the milk of cows entered in the breed tests at the 

 World's Columbian Exposition. He summarizes the results 

 obtained from the Jersey, Guernsey, and Shorthorn breeds in 

 the following table : 



Number and Size of Fat Globules prom Different Breeds 



Breed 



Number 

 of Cows 



Average 

 Number of 

 Days from 



Calving 



Number 



of Globules 



in .0001 



Cmm. 



Relative 

 Size 



Average 



Diameter 



of Globules 



Jersey . . 

 Guernsey 

 Shorthorn . - 



25 

 25 

 24 



156 

 151 

 150 



166 

 190 

 194 



290 

 217 

 177 



mm. 



.00395 

 .00358 

 .00335 



Average . 





152 



183 



228 



.00363 



It will be noted from these figures that the number of fat 

 globules was greatest in the milk of the Shorthorns and smallest 

 in the Jerseys. At the same time, the average size of the glob- 

 ules was decidedly greater in the milk of the Jerseys and smallest 

 in the Shorthorns. 



Eckles 2 reports the relative size of the fat globules in the milh 

 of eleven cows representing four breeds as follows : 



Wisconsin Report, 1894. 



2 B. A. I., 156, pp. 20-21. 



