제주도 한우의 번식장해 발생원인과 대책에 관한 연구 제2보 , 제주한우의 번식장해 발생상황 조사연구 = Studies on the Cause of Occurrence and Treatment for the Reproductive Disorder in Jeju Native Cattle 2 . A Study on the occurrence status of the reproductive disorder in Jeju native cows

다국어 초록 (Multilingual Abstract)

The objective of this study was the status of reproductive disorder for Korean cattle in Jeju-do area and provide the fundamental data for the suitable control of this problem. Four hundred and fifty seven cows were used in this survey according to the coast area, mountain area and enterprise properties in Jeju-do. The results are summarized as follows; 1. The total occurrence rate of the reproductive disorder due to genital discase(12.9%) and. distocia (3.3%) was 16.2%, but the figure did not include the delayed puberty and postpartum Estrus. 2. In total 457 cases, the cows with ovarian disease were 39 cows(8.5%), 6cows (1.3%), in uterine disease, 3 cows (0.7%) in vaginal disease and 11 cows (2.4%) in repeat breeder. 3. In 43 sterile cows, the animals with overian disease were over 65% ; in which ovarian atrophy appeared 30.5%, ovarian hypoplasia 15.2%, delayed ovulation 10.2% and ovarian cyst and persistent corpora lutes were both 5.1%. 4. The delivery disorders in total investigated cows were 1.5% with abortion, 0.9% stillbirth, 0.22 dystocia and 0.65% retained plecenta, and these results demonstrated that native cattle showed less delivery disorders than that of dairy cattle. 5. On the investigation of the delayed puberty 123 heads (40.9%) among 301 cows showed delayed puberty at 26-30 months old and 45 heads (14.9%) showed it at 31 months old. 6. Among 284 cows 103 heads (36.3%) were the alternate year calving cows which showed alternation more than once and in 760 total calving frequencies, the alternate year calving was 118 frequencies (15.5%).