LESSON THIRTY-SEVEN. 
SECRETION OF MILK. 
. Source of milk. 
. Structure of the udder. 
Mammary glands. 
How the udder is supported. 
Milk veins. 
. Factors influencing secretion. 
. Why milk is secreted. 
. Colostrum. 
CoONanrwne 
. Length of milking period. 
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. Evil of improper milking. 
. Regularity of milking. 
. When cows hold up their milk. 
. Hard milking cows. 
. Milking by hand. 
15. Machine milking. 
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m ow bo 
Note to the Teacher.—A large milk yield is a basic 
principle in profitable dairying. .The milk factory is the 
udder. A study of the udder and of milk secretion should 
be useful to every person who expects to ownacow. The 
teacher should emphasize the importance of good udders 
and well-developed milk veins. In judging work these 
points are discussed in detail. Consult the score card on 
page 191. 
400 
