First of all, the performance of material and some related parameters have to be known before making a decision about a breeding program.

Some estimates of genetic parameters between performance of purebred and their crossbred progenies may indicate that which method of selection is more effective on the genetic improving of crosses. High and positive genetic correlation between performance of purebreds and their crossbred half sibs is the sign of additive gene action and proposes that performance of the cross might be improved through intra-population selection in both parents (5,17). It is suggested that 8th week body weight of a cross could be improved more rapidly by ihtra-population selection in the parental populations (7).

If genetic correlation is negative or has a low positive value some other selection method based on crossbred progeny performance might be more preferable (17). The reciprocal recurrent selection based on crossbred performance would be more effective for genetic improving of quantative traits which are determined by nonadditive genes than the within strain selection based on purebred performance (3 A,13).
While considering several characters similar studies are done in many species of animals and also in egg production of popultry (5,6,9,12,14,15,17,18).
But there are less studies especially on the body weights of different ages of broiler.

The main purpose of this study was to estimate heritability of body weights at different ages and genetic correlations between performance of purebred (RTxRT) and their crossbred (RTxYR) progenies and to find out an effective selection method on parent stock of broiler.

A Testik

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 831-834, 1982
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