2 FIRST LESSONS IN DAIRYING 



tion and breeding have developed the udder of the 

 cow until we have reports of an udder which 

 weighed 41 pounds and 6 ounces; another which 

 measured nearly 6 feet in circumference, or w r ithin 

 6 inches of the animal's heart girth ; and others that 

 have secreted over 100 pounds of milk in a day, 

 another more than the animal's weight of milk in 

 less than two weeks and its own weight of butter 

 fat within a year, and over ten tons of milk within 

 a year. 



Structure of the cow's udder. The udder of the 

 cow is described as one large gland with four distinct 



CROSS SECTION OF COW'S UDDER AND ENLARGED ALVEOLI SHOWING: 



A, EPITHELEAL CELLS ENLARGED. AS WHEN GIVING MILK, AND 



B, THE SAME WHEN NOT IN MILK 



