To investigate the effects of reproductive gland on the pelt weight and fur quality of rabbit, experiments with rabbits which treated with common castration, partial castration, uncastration and D.E.S. implantation were conducted. The results were summarized as follows: 1) In pelt weight percentage female rabbit showed the lowest of 9.56% which was significantly lower (p$lt;0.01) as compared with the 10.36-12.18% 2) The pelt weight percentage of the D.E.S. implantation was higher as compared with that of the control. Apparently, the pelt weight percentage of 12.18% in the common castration with D.E.S. implantation eras significantly higher (P$lt;0.01) than the percentage 10.46 in the common castration. 3) The differences in male pelt weight were greater (P$lt;0.01) than in female. 4) The diameter of 31.8 μ in partial castration and that of 30.2 μ in uncastration were larger than the diameters in any other (P$lt;0.01) and the 25.6 μ in the common castration was the smallest. Therefore it is obvious that the thickness of hair is in proportion to the function of masculine hormone. 5) The hair length of 2.04 ㎝ in the uncastration and in the partial castration was longer than that of 1.54 ㎝ in the common castration (P$lt;0.01). Therefore, it could be said that masculine hormone is conducive to the growth of hair. 6) The hair growth was depressed by castration or D.E.S. implantation simulataneous treatment of castration and D.E.S. critically oppresses the growing of hair. 7) Definite relation between fur yielding and daily gain was not found.