Abstract
This study was designed to evaluate the relationship between plasma testosterone titers and mating behavior in lines of chickens that had undergone bidirectional selection for high and low mating frequency and in the unselected population from which the selected lines originated. Plasma testosterone (T) concentrations were determined by radioimmunoassay procedures. Also measured were packed blood cell volumes (PCV) and two behaviors, courtship and completed matings. Significant differences were found among lines for all measures with the high mating line ranking above the low mating line and the unselected control line being intermediate to the selected lines for all measures. Also found was a positive correlated response of plasma T titers to selection for the cumulative number of completed matings.
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