山羊間性の遺傳學的研究

Abstract

The object of this present study is to classify the intersexual goats on the basis of the anatomical observation. As materials 70 intessexual goats were used which showed various types of abnormality of genital organs. The results obtained are summerlised as follows :1. The external genital organs of the intersexual goats are different considerably according to different individuals. In some animals the clitoris develops so conspicuously as the penis, while in others the external genital organ is of female type. It is difficult to distinguish such animals as the latter ones from the normal femals. In addition to these types, there are many grades of intermediate ones.2. All the intersexual goats used in the present study have both Mullerian and Wolffian ducts. Their grades of development and differentiation are in accordance with those of the gonads and the secondary sexual characters.3. The intersexes of goats can be divided into 5 types on the basis of the anatomical structure, viz. male-, intermediate wale-, intermediate-, intermediate female- and female-type. It shows that number of individuals belonging to the male and female- types is somewhat smaller than that of three intermediate types.4. From the facts obtained in the present study, it is probable that the grade of intersexuality does not change according to age.