Avian postnatal growth can be treated as a process where birds undergo changes in form due to differential growth rates of their different organs and tissues. These changes are reflected in the morphology and physiology of the animal. In the present study we compare early embryonic development, especially somitogenesis and muscle cell formation, in birds from lines of quail exhibiting different patterns of postnatal growth. We use classical staging techniques that use developmental landmarks to categorize embryonic maturity as well as morphological measurements of specific tissues. These techniques were combined with immunodetection of somite specific gene products to test the hypothesis that differences in postnatal development would be reflected in patterns of embryonic tissue partitioning.
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