1. The cows slaughtered at age of 3, 4, 6, 7, 8, and 9 years old were 1.5, 1.5, 15.0, 62.5 and 4.4% respectively. 2. The cows slaughtered at 351-450kg and more than 500kg were 60 and 28% respectively. 3. Best, very good, good and bad cows in nutritional condition were 1.6, 25.8, 62.9, and 9.7% respectively. Among the six cows which were bad nutrition, the two were with severe endometritis, the three were normal in genital function and one was on 70 days of pregnancy. 4. Holstein cows(55.2%) showed higher reproductive failure than the Korean cows(33.3%). 5. The slaughted ratio of the Korean cattle and Holstein cows was 36 and 64% respectively. 6. Pregnant cows were about 16% among the slaughtered one. 7. Reproductive failures were composed of 46% in uterus, 32% in ovaries, 8% in udder, 6% in oviduct, 4% in cervix of uterine, 2% in vagina and 2% inmummified fetus. 8. Forty six percentages of uterine diseases were as follows; horn, 13%, body of uterus, 32% and ovary diseases were 32%, that is, 12% of ovary atrophy, 8% of ovarycyst and 6% of lutealcyst. 9. The cows of reproductive failures were commonly infected with 1.6 kinds of diseases. 10. According to classification, six type of ovaries were as follows; normal, 58%, ovary-cyst, 11%, luteum cyst, 4%, coexistence of follicles and corpus luteum, 16%, weak function of ovaries, 10% and ovarian atrophy, 1%. 11. Major axis, minor axis and thickness of right ovary were larger than those of left one both in Korean cattle and Holstein cows. Holstein cow had generally larger size of ovary than these of the Korean cattle.. 12. The left and right oviducts showed no difference in length, but Holstein had longer oviduct than Korean cow. 13. There was no difference in the length of uterine horn between right and left in the Korean cows, but the right was longer than the left in Holstein cows. 14. Holstein had longer horn and body of uterine than the Korean cows. 15. The weight of right ovary was heavier than that of left in both breeds, but there was no differences in weight of left ovary between two breeds and right ovary of Holstein breed was heavier than that of the Korean cow. 16. The weight of right oviduct and uterine born was heavier than that of the left, and Holstein had heavier oviducts and uterine horns than the Korean cows. 17. Holstein had heavier uterine body and cervix of uterine than the Korean cows. 18. The length of reproductive systems of Korean cow is as follows; Major and minor diameter and thickness ofovary are 3.6${pm}$0.7, 2.3${pm}$0.4 and 1.6${pm}$1.4 cm in left and 3.7${pm}$0.6, 2.5${pm}$0.5 and 1.8${pm}$0.5 cm in right. Oviduct is 28.4${pm}$3.1 cm in left and 27.8${pm}$3.3 cm in right. Uterine horn is 27.4${pm}$4.5 cm in left and 27.7${pm}$4.9 cm in right. Uterine body and cervix are 3.4${pm}$1.1 and 6.5${pm}$1.7 cm. 19. The length of female reproductive systems ofHolstein cow is as follows; Major and minor diameter and thickness of ovary are 3.9${pm}$1.3, 2.3${pm}$0.5, and 1.5${pm}$0.6 cm in left and 4.0${pm}$0.8, 2.8${pm}$0.6 and 1.8${pm}$0.6 cm in right. Oviduct is 29.4${pm}$4.2 cm in left and 29.3${pm}$4.1 cm in right. Uterine horn is 30.2${pm}$7.4 cm in left and 32.6${pm}$8.4 cm in right. Uterine body and cervix are 4.5${pm}$2.5 and 7.8${pm}$2.9 cm. 20. The weight of reproductive systems of Korean cow is as follows; Ovary is 8.4${pm}$4.1 g in left and 9.3${pm}$3.6g in right. Oviduct is 1.5${pm}$0.5 g in left and 1.6${pm}$0.5 g in right. Uterine horn is 109${pm}$27 g left and 118${pm}$32 g in right. Uterine body and cervix are 30.4${pm}$14.1 and 76.7${pm}$38.4g. 21. The weight of r..