[Histochemical and biochemical studies of the circannual aspects of carbohydrate-dependent energy metabolism of the hair follicles of Turkish Angora goats].

Based on biopsy material, the study describes circannual variations of the accumulation of glycogen and organic carbon in the hair follicles. The results have been obtained by histochemical and biochemical methods. The histochemical-densitometric analysis of glycogen contents in the cells of the outer epithelial root sheath of the hair follicles exhibited a clear circannual course, with maxima in May/June and December, and minima in March and August. The content of organic carbon of the hair follicles was 7.61 micrograms/mg (max. 21.56 micrograms/mg) DW on average, with a corresponding annual cycle. The findings are discussed with regard to the energy metabolism of the hair follicle, especially in view of the fact that a biphasic cycle of hair growth becomes obvious in the Turkish Angora goat, a phenomenon that is obscured by other methods.