Bioscientifica Proceedings

Summary. In calves made cryptorchid at birth, serum LH concentrations were elevated (P < 0.01) over those of intact controls by 7 weeks of age; a difference which persisted until after puberty. When intact and cryptorchid bulls were given LH-RH, i.v., at approximately 18 months of age, cryptorchid bulls were more responsive. Serum LH concentrations (mean ± s.e.m.) after 250, 1000 and 4000 ng LH-RH were 0.2 ± 0.03, 1.2 ± 0.3 and 12.1...