244 



Agricultural Chemistry. 



Standards for maintenance. The following table shows the 

 amount of digestible protein and net energy required per head 

 for the maintenance of cattle, sheep and horses of different 

 weights. No figures for swine are available. 



Arm^by's Maintenance Standards for Horses, Cattle and Sheep. 



Prom the table one sees that a colt of 500 Ibs. weight will re- 

 quire for daily support. 0.3 Ib. of digestible protein and 3.8 

 therms, while when it has trebled its weight the requirements are 

 0.65 Ib. of digestible protein and 7.9 therms. In other words the 

 requirements have not increased in proportion to the gain in 

 weight. 



Standards for growing animals. The following table gives 

 the digestible protein and energy required for growing cattle and 

 sheep, as set forth by Armsby. No data for horses and swine are 

 available. The table includes the maintenance requirement. 



The table shows that a six months old calf, weighing 425 pounds 

 requires 1.3 pounds of digestible protein and 6 therms of energy 

 value, which includes the 1.3 pounds of protein. Where the calf 

 has grown to weigh 1100 pounds, or more than doubled its weight, 

 it requires 0.35 pound more protein and 2 more therms. This 

 relative lessening in feed required is due to the fact that a larger 



