MAinjAL OF OATTLE-FEEBIITG. 



471 



count be taken of tlie fact tliat the total digestible carblij- 

 drates are likelj to exceed tbe nitrogen-free extract in 

 coarse fodder which is rich in protein, and to fall short of 

 it in feeding-stuffs having a low percentage of protein. 



There remains to be considered only the protein of the 

 coarse fodder, and just this substance shows the greatest 

 variations of digestibility. In general it is most digestible 

 in those feeding-stuffs which contain most protein and least 

 crude fibre, that is, in yomig and tender fodder, wiiile in 

 that which is old and woody or of coarse texture it is 

 generally less digestible. 



In the case above supposed both the hay and straw are 

 of nearly average composition, and we therefore assume 

 average digestion coefiicients for their protein, viz., 57 for 

 that of the hay and 38 for that of the straw. 



A simple computation now shows us that 100 pounds of 

 each of our four feeding-stuffs will furnish the following 

 amoimts of digestible nutrients : 



Lbs. 



Odt Btraw. 

 Lbs, 



Mangx>lds. 

 Lbs. 



Brewers* 



grains. 



Lbs. 



Protein 



Carbhydrates, 

 Fat.. 



5.13 



3.51 



1 



43.00 



33.00 



10 



0.92 



0.30 



« * 



4.25 



16.00 



0.80 



From these data w^e can easily calculate that the quanti- 

 ties of hay, straw, and mangolds which we have assxmied 

 to be available per day and 1,000 lbs. live-weight, together 

 with twenty pounds of brewers' grains, will furnish the 

 cows with the following quantities of digestible protein^ 

 carbhydratcs, and fat : 



