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The study was conducted to compare performance and abdominal adipose cellularity in broilertype female progeny o f commercial broiler breeder sires and White Plymouth Rock (WPR) dams, and in the W P R females. Nine hundred and eighty three WPR and 816 crossbred (CB) female progeny were fed diets containing 13 M J ME/kg" 1 and 20% CP ad libitum and body weight gain, feed intake and feed conversion, breast angle, carcass weight, abdominal fat weight and adipose cellular i ty were determined at 58 days o f age. Body weight gain and feed intake were significantly higher (P<0.05) by 15.3 and 18%, respectively, in the CB than in WPR progeny. Mean breast angle, carcass weight, abdominal fat weight and total l ip id in abdominal fat pad were also 12, 13.5, 33 and 42.8%, respectively higher (PO.05 ) in CB than WPR progeny. The CB progeny had significantly more fat cells o f 230 to 290 p m in diameter than W P R progeny (0.31 x 10 7 vs 0.12 x 10 ). Negative and highly significant (PO .01 ) correlations were observed between abdominal fat cell size and total fat cell number in abdominal fat tissue o f WPR and CB progeny (r = -0.89 and -0.93, respectively) suggesting that adipocyte hyperplasia and hypertrophy were contributing factors to adipose tissue growth. Al though the CB progeny outperformed WPR progeny, they however accumulated more abdominal fat and total l ip id and had more and larger adipocytes. K E Y W O R D S : crossbreeding, performance, adipose cellularity, broiler, chickens Corresponding author, currently at: Department o f Nutr i t ion and Food Science, 328 Spidle Hal l , Auburn University, Auburn, A L 36849-5605, U S A 380 PERFORMANCE OF BROILER CHICKENS

Performance and adipose cellularity of female progeny of White Plymouth Rock dams and commercial broiler breeder sires