Biol Reprod Keystone Symposia Conference on Frontiers in Reproductive Biology & Regulation of Fertility.
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Biology of Reproduction, Vol 32, 1080-1086, Copyright © 1985 by Society for the Study of Reproduction

ARTICLES

The effect of exogenous testosterone on homospermic and heterospermic fertility in the cock

DR Hagen and PJ Dziuk

Cocks were administered testosterone (T) for 14 days via 0, 1, 2, or 4 Silastic capsules implanted subcutaneously. Each capsule released 1.04 mg of T per day. Concentrations of T in plasma and the proportion of eggs fertilized from homospermic insemination of hens were determined. Concentrations of T in plasma were variable and unaffected by treatment. The proportion of eggs that were fertilized by cocks decreased during treatment with 1 capsule, increased over the experiment in the group with 2 capsules, and increased after treatment ended in the group with 4 capsules. In heterospermic tests, cocks with distinguishable offspring were paired and semen was mixed within pairs. One cock in each pair received either 1 or 4 Silastic capsules containing T for 14 days; the other cock in the pair received none. The proportion of chicks sired by cocks treated with 1 capsule remained unchanged throughout the experiment, whereas the proportion sired by cocks treated with 4 capsules decreased markedly during the recovery period. The response to T was apparently dependent upon dosage and the sensitivity of the cock to T. The concentration of T in the plasma of the cock had little relationship to fertility. These results indicate that heterospermic insemination can be used as a sensitive method to detect the subtle effects of hormonal treatment.




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Copyright © 1985 by the Society for the Study of Reproduction.