TY  - BOOK
AU  - VAN, Middelkeep J.H
TI  - Physiological and gentical aspects of egg production in white plymouth Rock Pullets
U1  - 636.582 V19P 
PY  - 1973///
PB  - Wageningen
KW  - EGGS -- PRODUCTION
KW  - PLYMOUTH ROCKS (POULTRY)
KW  - POULTRY -- PHYSIOLOGY
KW  - POULTRY BREEDING
ER  -