32 



SWINE PRACTICE 



foods are used in repair and growth. Non-nitrogenous foods, which 

 are largely carbohydrates and fats, are the source of energy and 

 the portion not consumed: in eiiergy products is stored as fat. 

 Inorganic foods are necessary to replace the same elements that 

 are found in various tissues and removed in secretions and ex- 

 cretions. Water and various mineral salts are the usual inorganic 

 foods. 



Diet depends upon the type of animal and its use. Mothers' 

 milk is the natural diet of new born mammals. Bv a series of 



Fig. 6. This "Cafeteria" is open twenty-four hours of the day. Pigs choose 

 what they want, as often as they want, and as much as they want. The 

 curl in their tails "registers" perfect contentment. (Cir. 119, Col. Agri. U. 

 of Wis.) 



experiments conducted at the Wisconsin Station, it was found that 

 sows produced on an average of from 4.9 to 6.3 lbs. of milk for a 

 series of 84 days. There is a wide variation in the quantity and 

 perhaps also in the quality of sow's milk. Analysis of milk from 

 a limited number of sows, shows that it contains approximately 7 

 per cent butterfat, 6 per cent casein and albumin, 5.7 per cent 

 sugar and 1 per cent of ash, or total solids of over 19 per cent. 

 The total solids of cow's milk rarely exceeds 13 per cent. The fat 



