Effects of Ovariectomy, Testosterone and 17.BETA.-Estadiol on Growth Rate and Body Composition of Female Turkeys.

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To determine the effects of testosterone and 17β-estradiol on female turkey growth, 36 female turkeys were ovariectomized and 36 female turkeys were sham-operated at 11 weeks of age in Experiment 1 and at 15 weeks of age in Experiment 2. One week after surgery, turkeys were implanted with pellets containing either placebo, testosterone or 17β-estradiol at the dose of 8.2mg/kg body weight at 12 weeks (Experiment 1) or 10.8mg/kg body weight at 16 weeks (Experiment 2). Turkeys were weighed weekly and body composition was determined at 21 weeks of age. Ovariectomy increased (P≤0.05) the growth rate when performed at 15 weeks, but not when performed at 11 weeks. 17β-Estradiol had no effects on the growth rate, whereas testosterone decreased the growth rate when implanted in turkeys at 16 weeks of age. Steroid implants interacted with ovariectomy to affect body composition in Experiment 1, in which 17β-estradiol reduced (P≤0.05) the moisture content and increased (P≤0.05) the fat content in intact female turkeys, but not in ovariectomized turkeys. Results in this study related 17β-estradiol only to body fat accumulation and ovarian development to the growth pattern characteristic to female turkeys.
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