Abstract
Two antibiotic feeding trials were conducted using New Hampshire cockerels. Zinc bacitracin was used at low (11 mg./kg. of feed) and at high (550 mg./kg. of feed) levels in one trial; oxytetracycline (at the same levels) was used in the other. Both levels of bacitracin caused significant increases in live weight; the high level of oxytetracycline depressed the growth rate at about two weeks of age.Under the allometric model, 1) a single equation sufficed to express the relationship between carcass weight and live weight for all six groups of birds; 2) high levels of either antibiotic led to smaller leg muscle per mass per unit body weight; 3) neither antibiotic had an effect on the growth of biceps brachii or superficial pectoral muscle up to 8 weeks of age; 4) bacitracin depressed the relative growth of the deep pectoral muscle; oxytetracycline did not.
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