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Dwarf pullets (dw gene) did not perform satisfactorily in the laying period if they were fed a low protein diet from hatching : their adult liveweight, the number of eggs and feed consumption during the laying period were significantly lower than those of the control birds fed a balanced diet. This effect was not found in their normal sisters. The difference between dwarf and normal chickens seems to be due to the dwarfism gene since this observation was made with birds coming from two different genetic types : White Rock and Rhode Island Red. The explanation may be found in the mode of action of the dwarfism gene which seems to disturb the secretion of the growth hormone or its utilization.

CONTROLLED FEEDING OF THE GROWING PULLET : INTERACTION BETWEEN THE METHOD OF RESTRICTION, THE DWARFISM GENE AND THE TYPE OF BIRD