ILLUSTRATION FROM ACTUAL EXPERIMENT. 



While these two hays approach each other very closely in composi- 

 tion, the Timothy proves to be much more digestible, and conse- 

 quently the more valuable as a source of nourishment. 



In order to ascertain the digestible matter in a cattle feed, it is 

 necessary to know the amount and composition of the feed that is 

 consumed by an animal in a given length of time, and also the amount 

 and composition of the solid manure or undigested portion excreted 

 in the same time. The difference between the amounts of the 

 different groups consumed, and the different groups undigested, will 

 give the amounts digested. The percejitoj^es of the groups digested 

 are called digestion coeflficients. 



DIGESTIBLE NUTRIENTS NEEDED BY THE DAIRY COW. 



A great many experiments have been made, principally by German 

 investigators, to ascertain the most suitable quantities of digestible 

 protein, carbohydrates, and fat, to be fed to milch cows daily in order 

 to secure the best results. Emil von Wolff an investigator himself 

 and also a close student of all experiments made along this line, has 

 expressed it as his belief that average milch cows of 1000 lbs. live 

 weight, need the following quantities daily. 

 Digestible : Protein, Fat, Carbohydates, Total. 



Pounds: 2.50 0.50 13.00 16.00 



Cows need approximately 16 pounds of total nutrients daily. 

 Animals th it are very thin in flesh, especially when fresh in milk can 

 consume two pounds more to advantage. Of these 16 pounds, 2.50 

 pounds of digestible protein are necessary, in order to enable the 



