DAIRYING 



25 



There is more or less variation in this respect among cows, 

 but the average figures obtained from the milk records of 1300 cows 

 has been reported as ist month, 3.75 per cent, fat; 3rd month, 

 3.50 per cent, fat, and last month of the period of lactation, 4.14 

 per cent. fat. ** 



C. Different Portions of One Milking. 



173. No one thing probably interferes more with the accuracy 

 of the results obtained by inexperienced persons in testing the 

 milk of each cow in a herd than the failure to take into considera- 

 tion the difference in richness of the first and the last milk drawn 

 from a cow's udder. When one wishes to know the richness of 

 milk given by a cow, all the milk including the "strippings" as well 

 as the "fore" milk should be included in the total amount; this 

 total quantity is then thoroughly mixed by pouring from one pail 

 to another before taking a sample of it for testing. The reason 

 for this mixing may be seen in the following figures which show the 

 richness of the milk drawn from different quarters of a cow's udder 

 in separate portions at one milking. 



Amount and Richness of Milk from Beginning to End of 

 Milking of One Cow.* 



In this case only a small amount of milk was- drawn in each 

 of the several samples into which the milking was divided. A 

 more striking difference between the richness of the first and the 

 last portion of one milking is shown when a cow gives a large 



** Kirchner Milchwirtschaft. 

 * Kirchner Milchwirtscaft. 



