Abstract
Summary A genetic study of the annual egg production and 23 different partial records was done on 950 Fayoumi pullets, daughters of 40 sires and 3dams, belonging to the Faculty of Agriculture Cairo University. The partial records include the egg production till 4044452 and 70 weeks of age using full trapnesting and partial trapnesting ( days every week), together with the annual partial trapnesting record, beside the production during six fixed periods all in the first year of the bird’s life (also using full and partial trapnesting). Sire, dam and combined heritability estimates were computed for the 24 traits beside the genetic correlations between the annual full record and each of the 23 partial records. Relative efficiencies of the genetic progress expected in the annual record using the different part records were studied. It was shown that the highest annual relative efficiency could be obtained by using for selection the production of the pullet during the 4 week period between 40 and 44 weeks of her age (trait Di2). A selection index using the production from first egg to the age of 40 weeks (trait Ai) beside trait Di2 was shown to excel that of D
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