コリデール種緬羊の毛胞群に関する研究-3-
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概要
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A histological observation has been made on the morphology of the hair follicle population, its density, S/P ratio and shedding of the hair from the follicle in the skin of the adult Corriedale sheep, as compared with those in the skin of the lamb of the same breed. Twelve sheep were used, of which 8 were adult 4 two years old and 4 three years old and 4 lambs.A small patch of skin was removed from the shoulder, belly and thigh regions of sheep a half, one and a half and two and a half years of age. Skin samples were prepared histologically.The results obtained were as follows:(1) There was little morphological difference in the hair follicle population between the adult (two and three years of age) and lambs. The hair follicle population of adult sheep is generally arranged In so-called "trio groups", but, in many cases, boundaries between trio groups and between primary groups in the trio group were not clearly seen.(2) New follicles with fibers of incomplete keratinizatlon are not seen in the follicle populations of adult sheep, except in the case of regrowth of fibers from shed follicles, while new follicles are found among the follicle populations in lambs.(3) It seems that the hair follicle and the sebaceous and sudoriferous glands associated with hair follicles increase in size and shape with the advancement in age from ono to three years.(4) A little difference exists among mean values of S/P ratio odtained from individuals of each age group of sheep and also among mean values of S/P ratio obtained from the shoulder, belly and thigh regions in each age group of sheep. The value is larger in the shoulder region than in the other two body regions.(5) A large individual difference in follicle density was found among age groups of sheep. Individual mean value of follicle density showed decrease in the two years old group and no large difference between the two and the three years old groups. A considerable difference in follicle density was also found among the 3 body regions of different age groups.(6) Shed follicles were found in the one, the two and the three years old groups of sheep. It seems that shed follicles are most numerous in the one year old group, and not so numerous in the two and the three years old groups. Therefore, a considerable difference in the number of shed follicles is found between the one and the two years old groups but no such difference between the two and the three years old groups.
- 公益社団法人 日本畜産学会の論文