FEEDING OF GROWING ANIMALS 301 



the body about 3 g. must be present in the food, 

 then the daily amount required is in round numbers 

 12 g. (^ oz.) each of lime and phosphoric acid, but 

 on a milk diet less than half this quantity. It is 

 thus possible to estimate whether a ration contains 

 sufficient of these nutrients, and what addition of 

 phosphate of lime is necessary if there is a deficiency 

 of phosphoric acid. 



As regards the fattening of young pigs, a large 

 number of investigations have taught that the 

 protein in the ration must be kept at a fairly high 

 figure. In one series of experiments with pigs of 

 the Yorkshire breed, which weighed 57-60 kg. 

 (125-130 lbs.) each, the daily increase of weight 

 over a period of 90-95 days was : with maize, 

 0-465 kg. (1 lb.) ; with barley, 0-665 kg. (i"5 lbs.) ; 

 with maize and separated milk, 0-735 kg. (i-6 lbs.) ; 

 and with barley and separated milk 0-745 kg. 

 (1-64 lbs.). The total increase of weight with 

 maize alone was 45-0 kg. (99 lbs.), and with barley 

 and separated milk 70-5 kg. (155 lbs.) — a remarkable 

 increase which must be ascribed to the extra 

 quantity of protein. The pigs, it is true, would 

 become fat on the maize, which is poor in protein, 

 but they would never reach the perfect develop- 

 ment which is assured by a more nitrogenous diet, 

 and — what is very important from the financial 

 side of the question — they require considerably 

 more food for an increase of 100 lbs. than when 



