There was no difference (P > 0.05) in body weight between the Control and GnRHa-treated rams at any age. Peripubertal GnRHa-treatment significantly (P < 0.01) suppressed normalized testes size, compared to Control rams, at both 28 and 41 weeks of age (Fig. 2). In the GnRH-Rec group, normalized testes size increased significantly (P < 0.001) by 25% over the 37 weeks following discontinuation of GnRHa-treatment. Normalized testes size during the breeding season in the second year of life, being 47% higher compared to the breeding season of the previous year. At 81 and 99 weeks of age, there was no difference (P > 0.05) in normalized testes size between Control and GnRHa-Rec groups.