226 



Feeds and Feeding. 



m. Cbw'« Mine and its By-prodtidt. 

 Digestible nutrients and fertilizing constituents. 



Kind of mlllL. 



Dry 



matter 



In 100 



pounds. 



Digestible nutrients 

 In 100 pounds. 



Pro- 

 tein.* 



Carbo- 

 hy- 



dratesf 



Ether 



ex- 

 tract.! 



Fertilizing constlto- 

 enta in 1,000 pounds. 



Nltro- 

 G^en. 



Phos- 



phorle 



acid. 



Pot 

 Mb. 



Coyfr,'B milk 



C!ow'b milk, colostrum. 



Bkim milk, gravity 



Bkim nulk, centrifugal 



Buttermilk 



Whey „ 



Lbs. 



12.8 

 25.4 

 9.6 

 9.4 

 9.9 

 6.6 



Lbs. 



3.6 

 17.6 

 3.1 

 2.9 

 3.9 

 0.8 



Lbs. 



4.9 

 2.7 

 4.7 

 5.2 

 4.0 

 4.7 



Lbs. 



3.7 

 3.6 

 0.8 

 0.3 

 1.1 

 0.3 



Lbs. 



5.3 



28.2 

 5.6 

 5.6 

 4.8 

 1.5 



Lbs. 



1.9 

 6.6 

 2.0 

 2.0 

 1.7 

 1.4 



Lbi. 



1.8 

 1.1 

 1.9 

 1.9 

 1.6 

 1.8 



• Omseln and albumen. f Milk susar. J Fat. 



349. Concerning miik. — ^Milk is a substance designed by nature 

 for the sole purpose of nourishing young animal life. For this 

 reason it must always possess a peculiar interest to the student 

 of animal nutrition. It seems reasonable to suppose, from its 

 single purpose, that TnilV not only contains all the nutrients nec- 

 essary to sustain the life of young aniTnala but that these are 

 arranged in proper proportion. 



350. Fat and serum. — The milk of the cow may be divided into 

 fe.t and milk serum. The percentage of fat in the milk of the 

 same cow may vary greatly both in the entire milk produced al; 

 different periods and in different portions drawn at the same 

 milking. The first milk drawn is poor in fat, while that last 

 drawn is very rich, as is shown by the following table prepared 

 by Babcock of the Wisconsin Station: i 



Percentage composition of first and last mUk from the cow and of the 

 serum — Wisconsin Station. 



1 Bui. 18. 



