PLANNING A R.\TION 73 



sufficient for twenty-four hours. If animals are heavier 

 in weight, the standard can be changed to vary in direct 

 proportion to the five weight of the animal; the iioo 

 pound animal requiring 10 per cent more and the 900 

 pound animal requiring 10 per cent less than the amount 

 given in the table. The 250 pound hog will require ^ of the 

 amounts set forth in the standard. In the Appendix will 

 be found the number of pounds of total dry matter, di- 

 gestible protein, carbohydrates, and fats in feed stuffs. 

 If the feeds are combined so that the sum of the nutrients 

 they furnish in combination corresponds to the number 

 of pounds called for in the standard, the ration will be 

 balanced according to the standard. 



Figuring a Ration. — To plan a ration for a 1000 pound 

 steer at rest, first find the requirements according to the 

 standard used. The Wolff-Lehmann standard calls for 

 18 pounds of total dry matter, 0.7 pound of digestible 

 protein, 8.0 pounds of digestible carbohydrates, and o.i 

 pound of digestible fats in the ration. The nutritive ratio 

 of the mixture should be i : 11.8, which is wide, because 

 the steer at rest needs little protein but requires considerable 

 heat-making food to maintain the temperature of the body. 

 Roughage is better for this purpose than are concentrates. 



Assuming that timothy hay and oat straw are both 

 available, 10 pounds of each can be taken as a trial ration. 

 The Appendix tables show that in 100 pounds of timothy 

 hay there are 86.8 pounds of dry matter, 2.8 pounds of 

 digestible protein, 42.4 pounds of digestible carbohydrates, 

 and 1.3 pounds of digestible fats. In 10 pounds of timothy 

 hay there will be rU of those amounts, or 8.68 pounds of 

 dry matter, 0.28 pound of digestible protein, 4.24 pounds 

 of digestible carbohydrates, and 0.13 pound of digestible 



