140 KLEMENTARY TREATISi; ON STOCK FEEDS AND FEEDING 



Work Requirements. — A working animal requires protein to 

 repair the broken down tissues and carbohydrates and fats to 

 produce energy. Therefore the harder an animal has to work 

 the more protein and carbohydrates are needed. The protein 



Fig. 11. — Saddle horse; a moderately worked animal — after Good. 



is usually increased in greater proportion than the carbohydrates. 

 The standards for horses illustrate this : 



Dry matter 

 pounds 



Digestible 

 protein 

 pounds 



Digestible 

 carbohy- 

 drates 

 pounds 



Nutritive 

 ratio 



Horses, lightly worked 

 Horses, moderately worked 

 Horses, heavily worked 



20 

 21 



23 



1-5 

 1-7 



2-3 



10.4 

 II. 8 

 14-3 



1:6.9 

 1:6.9 

 1:6.2 



Milk Production Requirements. — The protein requirements for 

 milk production are not entirely satisfactory for all parts of this 

 country, and this will be discussed later. Suffice it to say that 

 milk contains nitrogenous compounds, and enough protein must 



