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젖소의 번식성적과 분만후 혈장내 Vitamin E 및 Selenium에 관한 연구
이종완,주동열,임병순 공주대학교산업개발연구소 2000 産業開發硏究 Vol.8 No.-
In this study, records of 33 cows from 20 farms were studied for herd size, feeding career, breeding record, milk yield by parity, days of dry period, days at 1st AI, number of AIs per conception, birth interval, reproductive disorder, and retention of afterbirth. And also vitamine E and selenium contents for 3 to 9 weeks after calving to find relationships with primipara age, age, dry period, days at 1st calving, hours of afterbirth, days of vaginal discharge. This study was conducted to examine the association of reproductive characteristics of dairy cows with improvement of production performance. The results were as follows; 1. For the effect of herd size on reproductive performance, farms with more than 16 multiparous cows showed 2.6 days, 23.6 days, and 23.5 days shorter for dry period, days open, and birth interval respectively. And also, reproductive disorder was 3.4% lower than other farm sizes. For the effect of feeding career, farms with over 12 years of feeding career, dry period, days open, and birth interval were 2.1 days, 14.3 days, and 14.4 days shorter, respectively, and number of AIs per conception and reproductive disorder were reduced by 0.4 and 0.8%, respectively. 2. The herds with reproductive records keeping showed 21.9 days and 22.0 days shorter for days open and birth interval, respectively, than those without reproductive records keeping. And also, number of AIs per conception and reproductive disorder were reduced by 0.5 and 3.7% respectively. For the farms with annual milk production over 6,100㎏, dry period, days open, birth interval, and days at 1st AI were 3.7 days, 17.4 days, 17.3 days, and 0.7 day, respectively shorter than those with annual milk production less than 6,100㎏. The number of AIs per conception, reproductive disorder, and retention of afterbirth were also reduced by 0.1, 3.3%, and 3.4%, respectively. 3. For the herds with the level of vitamin E less than 7.0㎍/㎖ in blood serum 3 weeks after calving, dry period and retention of afterbirth were reduced by 4.5 days and 2.9%, respectively. For the farms with the level of vitamin E greater than 7.0㎍/㎖ in blood serum 3 weeks after calving, reproductive disorder and retention of afterbirth were reduced by 7.9% and 1.4%, respectively. 4. For the herds with primipara age less than 24 months, dry period and number of AIs per conception were reduced by 3.8 days and 0.2 respectively. In 3 to 9 weeks after calving, blood serum content was 4.8ng/㎖ more and hours of afterbirth and days of vaginal discharge was reduced by 0.5 hr and 1.9 day, respectively. 5. For the herds with cows age less than 48 month, days open and birth interval were 14.5 days and 23.6 days longer, respectively. The vitamin E content in blood serum was 0.9㎍/㎖ less but selenium content was 4.2ng/㎖ higher. The hours of afterbirth and days of vaginal discharge were reduced by 1.2 hr and 0.8 day. 6. For the herds with the level of vitamin E less than 7.0㎍/㎖ in blood serum 9 weeks after calving, dry period, days open, birth interval, and days of vaginal discharge were reduced by 8.4 days35.9 days, 45.6 days, and 3.6 days, respectively. However, for the herds with selenium content greater than 90ng/㎖, dry period, number of AIs per conception, hours of afterbirth, and days of vaginal discharge were reduced by 3.3 days, 0.3, 0.5 hr, and 1.8 day, respectively. 7. The vitamin E content in blood serum was 6.3 ㎍/㎖ in 2 weeks after calving and increased to 12.3㎍/㎖ in 6 weeks after calving. The selenium content was 38.2ng/㎖ in 2 weeks after calving and showed 62.3 to 66.7ng/㎖ in 7 to 9 weeks after calving.
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