96 



A STUDY OF FARM ANIMALS 



more digestible nutrients, and make the nutritive ratio cor- 

 respond closer to the standard. We might use a small 

 amount of some commercial feed stuff, to adjust this ration, 

 but suppose we use a common home-grown product, and add 

 three pounds of oats and note the result. Turning to the 

 table of the composition of feeding stuffs, Table A, Ap- 

 pendix, we find the following relating to oats. 



Oats Dry matter Digestible Total digestible 



protein nutrients 



100 Ibs. contain 90.3 Ibs. 9.7 Ibs. 70.4 Ibs. 



Then 3 Ibs. contain 2.72 Ibs. .29 Ibs. 2.11 Ibs. 



Adding this to the total in the original ration, we have 

 the following: 



This ration contains a slight excess of dry matter which 

 is not at all serious, while it is actually balanced in its nutri- 

 ents, and very nearly meets the nutritive ratio standard. 

 We may, therefore, regard this ration properly calculated 

 and corrected to suit the animal's needs. It also has the 

 advantage of consisting of feeds easily produced or obtained 

 over much of this country. 



COMPUTING STANDARDS FOR DAIRY CATTLE 



The feeding standards for dairy cattle as previously 

 stated, are based on the yield of milk as well as the weight 

 of the animal. Haecker adopted a standard in which he 

 first established a maintenance ration for the support of a 

 1,000-pound cow, consisting of 0.7 pound digestible protein, 

 7.0 pounds digestible carbohydrates and 0.1 pound digestible 



