Abstract
To investigate the control of pulsatile LH secretion by testosterone in male sheep, castrated rams (wethers) were implanted at the time of castration with Silastic capsules filled with crystalline testosterone. The capsules were either 15 cm (0.5T capsule) or 30 cm (T capsule) in length, and the following treatments were imposed: no capsules (intact rams; control wethers); one 0.5T capsule; 2T capsules; 4T capsules. Testosterone and LH secretory patterns and LH responses to LHRH were characterized after 6 weeks of hormone treatment. Serum testosterone concentrations (nanograms per ml; mean ± SE) were as follows: rams, 2.25 ± 0.49; control wethers, 0.22 ± 0.01; 0.5T, 0.54 ± 0.1; 2T, 1.11 ± 0.08; 4T, 2.01 ± 0.09. Basal LH concentrations (nanograms per ml) and number of LH pulses per 24 h were, respectively: rams, 1.2 ± 0.1 and 3.3 ± 1.2; control wethers, 9.3 ± 3.6 and 29.5 ± 0.5; 0.5T, 14.6 ± 3.3 and 27.7 ± 1.8; 2T, 8.9 ± 0.6 and 20.3 ± 0.9; 4T, 1.3 ± 0.2 and 2.7 ± 1.8. Wethers with 2T implants showed a sig...
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