Abstract
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 ± 2.0 ng/ml for intact bulls and 1.0 ± 0.6, 5.1 ± 0.8 and 19.6 ± 2.1 ng/ml for cryptorchid bulls.
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