Inmost of the flocks of laying hens,selection on the quantitative increase of productivity,disregarding egg and shell quality traits,is being carried out.At the same time it is observed that the greater increase of laying level,the higher number of cracked eggs per flock is/Van Tijen,1977/.Hamilton and others found that 6-8J0 of eggs was damaged on the way to the consumer.On some farms the number of cracked eggs deviates from 1 to 2% sometimes exceeding even 35%

The actual researches aimed at determining interdependences between formation of egg qualitative traits and selection on the quantitative increase of productivity in two strains of Leghorn hens

S Wezyk, B Roztcka

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 858-868, 1982
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