Abstract
Male chickens grow faster and are more efficient in their feed conversion than females. Due to their faster growth the male birds reach broiler weights about 7 to 10 days sooner than the females. These two factors are important to broiler growers since feed represents approximately 70% of their production costs.Implantation or injection of male sex hormones in the female sex of various farm animals has given varied results. Dinusson et al. (1950) found that the treatment of heifers with testosterone propionate appeared to stimulate growth but the effect was of short duraton. Woehling et al. (1951) found no significant deviation from the control in rate of gain or in feed efficiency of pigs. Bogart et al. (1951) reported both increased gains and feed efficiency for treated heifer calves (injected with an aqueous suspension of pure testosterone) over the control animals. Almquist (1952) implanted 50 mg. testosterone propionate pellets …
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