Abstract
Six adult Angora bucks, housed under natural photoperiod for 15 months in a temperate southern hemisphere environment, were examined for seasonal changes in testicular size and secretion of LH and androgens. The pattern of testicular growth and regression lagged behind the photoperiod by 9 weeks over which time the continuing development due to maturation of the animals was superimposed. The seasonal secretion of androgens was parallel to, but lagged behind, the photoperiod by 16 weeks. Blood sampling over 24 hours every second month revealed that the mean LH and androgens levels were respectively 47 and 876% higher in March than at their lowest levels at the end of the breeding season (July), and the secretion of both hormones remained low from July to January. There appeared to be no diurnal pattern for the secretion of either hormone at any time of the year.
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