360 The Feeding of Animals 



volves the storage of more food substance than with 

 other domestic animals. The data at our command 

 warrant the statement, in a general way, that when a 

 pig gains 1.5 lbs. daily in live weight he stores not 

 less than .84 lb. of dry substance, of which .18 lb. 

 is protein and .63 lb. is fat, these figures representing 

 the average growth during the life of the animal. 



Lawes and Gilbert estimate that the increase of pigs 

 while fattening has the following composition: 



Water Dry substance Ash Protein Fat 



22% 78% .10% 6.4% 71.5% 



According to these figures the protein storage, with 

 1.5 lbs. daily gain, would be only .10 lb. and the fat 

 1.07 lbs. 



FOOD REQUIREMENTS FOR PORK PRODUCTION 



Feeding the r/r/>;?. — Under a system of intensive 

 production pigs go to market so young that we may 

 properly discuss their feeding from birth. We deal 

 first with the mother as a milch animal. According 

 to observations by Henry, in an inquiry as to the 

 yield and composition of sow's milk, it seems probable 

 that in proportion to their weight small sows yield as 

 large a quantity of milk solids dailj^ as a good cow. 

 The average daily production of milk solids per animal 

 appeared to be about one pound. This would be four 

 pounds for four sows, which is the equivalent of the 

 solids in over thirty ]iounds of cow's milk of average 

 quality. It follows, therefore, that the demands upon 



