AN EARLIER report on the percentage of various carcass parts indicated that differences due to age and sex with one commercial source broiler chicken between 6 and 10 weeks were not particularly outstanding (Moran and Orr, 1969). Confirming the data shown by Swanson et al. (1964) the female was observed to have a larger proportion of breast but smaller percentage of drumstick than the male. With regard to age there appeared small but noticeable increases in the relative amount of breast at 8 and 9 weeks with the male and female, respectively. To investigate the degree of variation which might be encountered with the multitude of commercial crosses yet avoid actual experimentation with each, Moran et al. (1970) determined the differences which existed between two of the most commonly used broiler breeds and their reciprocal crosses. The breeds studied were pure but not inbred lines of Cornish and White Rocks.…
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Moran et al. (1970) studied this question.