i68 



Condensed Milk and Miek Powder 



the weaker is the relative resistance which they must overcome in 

 their upward passage. 



Effect of Locality and Season. — Since the predominating size 

 of fat globules in milk, varies with breed and period of lactation of 

 the cows, 1 the ease with which evaporated milk separates and the 

 difficulty of overcoming this defect, differ greatly with locality and 

 season of year. The fat globules in milk from the Channel Island 

 breeds, average two to three times as large as those in milk from the 

 Holsteins and Ayrshires. Therefore, factories located in Holstein 

 and Ayrshire territories are not troubled nearly as much with fat 

 separation in eVaporated milk, as factories in localities where Jerseys 

 and Guernseys predominate. 



Again, the fat globujes are largest at the beginning of the 

 period of lactation and decrease in size as the period of lactation 

 advances. 



Relation of Breed and Period of Lactation to Size of Fat Globules 1 



i Hunzilcer, Mills and Spitzer, "Moisture Control of Butter." 

 Experiment Station, Bulletin No. 159, 1912, pp. 330-334 



Indiana Agricultural 



In order to equalize the output of evaporated milk throughout 

 the year, condensing concerns make every effort to induce their 

 patrons to time the breeding of their cows in such a way that the 

 fresh cows are distributed throughout the year. The result of this 

 practice is, that the milk supply of these factories represents, at all 

 times a mixture of milk from cows at all stages of their period of 

 lactation. This naturally equalizes the behavior of the finished 

 product as far as separation of the fat is concerned, facilitating the 

 control of this separation. On the other hand, in localities of fac- 



