4OO 



NUTRITION OF FARM ANIMALS 



TABLE 92. AVERAGE GAINS BY GROWING CALVES PER 1000 POUNDS 



LIVE WEIGHT 



b. Swine. Similar approximate estimates may be made for 

 the pig from data reported by Henry. 2 At weekly intervals, 

 up to 70 days old, the computation is based on the live weights 

 and gains shown in Henry^s table. The gains by the older 

 animals are estimated on the basis of his statement 3 that the 

 larger breeds should weigh 250 pounds at one year, it being 

 assumed that the rate of gain would decrease at an approxi- 

 mately uniform rate. 



It is evident that the results on the heavier animals as compiled 

 by Henry were obtained by heavy feeding for fattening, since it may 

 be computed from the figures for the weights and gains that the ani- 

 mals would reach a weight of about 320 pounds at about 10 months 

 old. The energy content per pound of gain is estimated on the as- 

 sumption that it would increase uniformly from the average of 

 about 500 Cals. obtained by Wilson and by Wellmann for young 

 pigs (458) up to 2485 Cals. as computed in Table 65 of Chapter X 

 (442) for Soxhlet's swine No. 3 at 500 days old. 



1 Average of Soxhlet's experiments. 

 3 Loc. cit., p. 553. 



2 Feeds and Feeding, xoth Ed., p. 499. 



