Testing Milk on the Farm. 157 



It should be remembered that a high production of but- 

 ter fat in the course of the whole period of lactation is 

 of more importance than a very high test. 



1. How does the test of the milk yielded by a cow generally 

 change with the advance of the. period of lactation? 



2. Mention at least six causes of variations in the test of a 

 cow's milk. 



3. How is an accurate sample taken of a cow's milk? 



4. Between which limits is the test of milk of single cows 

 and of a herd likely to vary? 



5. Will it introduce any error in the! test of a cow's milk to 

 measure out the sample directly after milking ?If so, how much? 



6. How many times should the milk of a cow be weighed and 

 tested to calculate! the total production of milk and butter fat 

 by the cow during a whole period of lactation? 



7. What is an official test of a cow? 



8. How does the test, as a general rule, change during the 

 first couple of wc^eks after the cows are let out on pasture in the 

 the spring? 



9. How do changes in the feed of a cow influence the quan- 

 tity and the quality of her milk? 



