296 PRODUCTIVE FEEDING OF FARM ANIMALS 
eaten are secured from young pigs; or, to put it in another way, 
the amount of feed required for a pound of gain is smallest in the 
case of young pigs, and increases steadily with advancing age (Fig. 
72). The fact is brought out in a striking manner by the follow- 
ing compilation by Henry’ of over five hundred feeding trials 
conducted at American experiment stations with over 2200 pigs 
The Relation of Weight of Pigs to Feed Consumed and Rate of Gain 
Eee’ 
Average | Average deity pak Average f Feed 
Weight of pigs, | Number live feed eaten 100 gain per anda 
pounds of animals eHEnE per day, Pounds a Paik 
e ounds 4 
pounds pounds wont p pounds 
pounds 
15 to 50 174 38 2.2 6.0 0.8 293 
50 to 100 417° 78 3.4 4.3 0.8 400 
100 to 150 495 128 4.8 3.8 1.1 437 
150 to 200 489 174 5.9 3.5 1.2 482 
200 to 250 300 226 6.6 2.9 1.3 498 
250 to 300 223 271 7.4 2.7 1.5 511 
300 to 350 105 320 | 7.5 2.4 1.4 535 
in all. In compiling the results given in the table, six pounds of 
skim milk and twelve pounds whey were rated equal to one pound 
of concentrates (one feed unit). The table shows the average weight 
of the pigs in each group, the feed eaten daily and per 100 pounds 
live weight, the daily gains made, and the feed per 100 pounds 
gain (Fig. 73). 
WEIGHT OF 
PIGS- LBS 100 200 300 +400 += 500 ~——« 00 
15-50 
50-100 
100-150 
150-200 
200-250 
250-300 
300-3550 
Fia. 72.—The amount of feed consumed per 100 pounds of gain for fattening pigs increases 
with their live weights. 
2 Feeds and Feeding,” 10th ed., p. 502. 
