Testosterone concentrations in the seminal plasma of cocks ranged from 0.46 to 5.05 ng/ml and were substantially lower than in blood plasma. No significant variation was noted in seminal plasma testosterone concentrations during the light phase of the day, whereas the concentration in blood declined over this period. Spermatozoal concentration and seminal testosterone decreased in the third sample of the semen collected sequentially at 3 h intervals. Testosterone concentrations in seminal plasma (1.57 +/- 0.17 ng/ml) and in the semen from the ductus deferens (1.34 +/- 0.24 ng/ml) were not significantly different.

No abstract

1. The effects of relatively small concentrations of polychlorinated biphenyls (PCB) in the diet of hens on the hepatic microsomal aryl 4-monooxygenase [EC 1.14.14.1] activity in their progeny were investigated. 2. PCB caused enhanced activity of aryl 4-monooxygenase in the progeny.