340 PRODUCTIVE FEEDING OF FARM ANIMALS 
The foregoing applies to ducks, turkeys, etc., as well as chickens. 
Feeding standards are not in any way iron-bound, but they are 
valuable guides to the feeder in aiding him to mix rations which 
many years of careful feeding investigations, borne out by practical 
experience, have found to be most suitable to the needs of poultry. 
Growth.—The growing chick requires quite a large amount of 
protein in its feed to build the new bone, muscle and feathers 
which develop as growth goes on. 
Laying.—The laying hen, on the other hand, has stopped 
growing, and less protein in the ration is needed to repair the con- 
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Fic. 98.—Farm poultry colony house, 8x10 feet, capacity 25 to 30 birds. 
stantly breaking-down body tissue, but for the production of eggs 
proteid material is required in considerable amounts for the making 
of albumen, so that a laying hen requires almost as narrow a ration 
as growing stock. 
Fattening.—The mature fowl that is being fattened for market 
should be fed a wider ration than laying or growing stock as it is 
being fed largely for the purpose of developing fatty tissue. Such 
fowls are fed only enough protein to repair body waste and supply 
sufficient extra protein material to lay on some new meat tissue 
mixed in with the fat so that the resulting carcass will be juicy and 
well marbled. To properly fatten, a fowl must lay on a mixture 
of lean-meat and fatty tissue; if lacking in fat well interspersed 
