... Q. Original articleIncrease of egg weight with age in normal and dwarf, purebred and crossbred laying hensF Minvielle,P MératJL MonvoisinG Coquerelle,A BordasInstitut ... and with egg production traits (egg number, age at first egg, egg weight at end of test and bodyweights at 17 and 52 weeks of age) were calculated both within and ... exponentielleINTRODUCTION Egg weight increases curvilinearly with age of hen (Cowen et al, 1964). Althoughit might be advantageous to have egg- laying hens producing quickly and...