STOCK 



We have also to consider the source of the nutrients. It is 

 known that the digestible nutrients in coarse feeds yield smaller 

 returns, poung for pound, than those in grains. Then again 

 the matter of proportioning the quantity of nutrients to the 

 weight of the animal can at best give only approximate results. 

 The actual milk and butterfat production must always remain 

 the principal factor in determining the quantity of nutrients 

 required by the dairy cow. 



CALCULATING RATIONS. A ration is the amount of feed re- 

 quired by a cow in 24 hours. The method of compounding 

 rations consists in selecting from the feeds at our disposal such 

 quantities as will contain the amount of nutrients called for by 

 the standard. To illustrate, let us make up a ration for a cow 

 yielding daily 22 pounds of milk of average quality, using the 

 Wolff-Lehman standard (p. 6). The feeds at our disposal are 

 wheat bran, cotton seed meal, corn silage, and corn stover. 



By a number of trial calculations we find that the required 

 nutrients are approximately obtained by selecting 6 Ibs. of 

 wheat bran, 4 Ibs. of cotton seed meal, 8 Ibs. of corn stover and 

 40 Ibs. of corn silage. The calculation is made from Table 2 

 (p. 5) in the manner shown below : 



Amt. in 



100 Ibs. 



Protein in G Ibs. bran = 12.2 X -06 = 0.732 Ibs. 



Protein in 4 Ibs. cotton seed meal = 37.2 X -04 = 1.488 Ibs. 



Protein in 40 Ibs. corn silage. . . = 0.9 X .40 0.360 Ibs. 



Protein in 8 Ibs. corn stover = 1.7 X .08 = 0.136 Ibs. 



Total protein = 2,716 Ibs. 



Standard = 2.50 Ibs. 



Carbohydrates in 6 Ibs. bran = 39.2 X -06 2.352 Ibs. 



Carbohydrates in 4 Ibs. C.S. meal = 16.9 X .04 = 0.676 Ibs. 



Carbohydrates in 40 Ibs. corn sil. = 11.3 X .40 = 4.520 Ibs. 



Carbohydrates in 8 Ibs. corn sto. = 32.4 X .08 = 2.592 Ibs. 



Total carbohydrates = 10.140 Ibs. 



Standard . . = 13.00 Ibs. 



