Studies on Spermatogenesis in Korean Native Cattle

Lee, Jae-hong; Lee, Seong-ho; Park, Young-seok

Korean Journal of Veterinary Research 1986;26(2):201-210.

Jae-hong Lee¹, Seong-ho Lee², Young-seok Park¹

¹Department of Veterinary Medicine, College of Agriculture, Chonnam National University
²Gong-joo National Junior College

한우(韓牛)의 정자발생(精子發生)에 관한 연구(硏究)

이재홍¹, 이성호², 박영석¹

¹전남대학교 농과대학 수의학과
²공주전문대학

Abstract

The cycle of the seminiferous epithelia in the testis of mature Korean native cattle was divided into twelve stages, using criteria the morphological changes in the acrosomic system and the nuclei of developing spematids and germ cells. The results were summarized as follows; 1. The minimum number of tripe A spermatogonia were the average of 1.8 in both at stages I and VI, while maximum numbers were the average of 4.2 at stage XII. Some type A spermatogonia divided at stage XII to produce the type intermediate(IN) spermatogonia at following stage I. The intermediate type spermatogonia divided at stage IV to produce the type B spermatogonia at stage V. 2. The type B spermatogonia divided at stage VII to produce the preleptotene primary spermatocytes at stage XII. The pachytene primary spermatocytes divided at stage XI to produce the secondary spermatocytes at stage VII. The secondary spermatocytes observed at stag XII divided to give rise to the round spermatids at following stage I. Each numbers of the first spermatocytes and of spermatids were almost constant, respectively, through the cycle of the seminiferous epitherium. 3. The relative frequencies of each stage among stages I to XII of the cycle of the seminiferous epithelia were 6.1, 3.7, 5.2, 7.8, 2.2. 3.3, 13.8, 18.4, 11.8, 7.2, 18.1% and 2.4%, respectively.