DAIRY HERD 



63 



careless milking. Great daily fluctuations in the yield 

 of milk are also in most cases the result of indifferent 

 and inefficient milkers. 



Collecting Samples of Milk for Testing. The milk 

 from each cow should be tested about once a month dur- 

 ing the whole period of lactation. A satisfactory way of 

 doing this is to collect what is known as a composite 

 sample, which consists in securing about one-half ounce 

 of milk from each of six consecutive milkings and placing 

 this in a half pint composite sample jar (Fig. 12) con- 



Fig. 13. Test Bottle Rack. 



taining a small amount of preservative. A test of this 

 composite sample will represent the average per cent 

 of butterfat for the period during which the sample 

 was taken and will serve with sufficient accuracy as the 

 average test for the entire month. 



Each composite sample jar should be carefully labeled 

 by placing the name or number of the cow upon it. A 

 convenient rack for these jars is shown in Fig. 13. 



