|
KMID : 1005220070220020111
|
|
Journal of Embryo Transfer
2007 Volume.22 No. 2 p.111 ~ p.114
|
|
|
Survey on Reproductive Traits of Average and High Yielding Holstein Cattle
|
|
Baek Kwang-Soo
Lee Wang-Sik
Ahn Byeong-Seog
Kim H. S.
Kim S.-B.
Son Jun-Kyu
|
|
|
Abstract
|
|
|
|
This study was carried out to investigate the reproductive performance of average (less than 10,000 liters milk in 305 days) and high yielding (more than 10,000 liters milk in 305 days) Holstein cattle at commercial dairy herds (n=22). Data on milk progesterone (10 to 60 days postpartum), days to post-partum estrous, days to post-partum conception, service per conception and calving interval were recorded for two consecutive years. Post-partum milk progesterone concentration and days to reach peak milk progesterone concentration were similar in high and average yielding cows. High yielding cows took more days to show signs of first postpartum estrous than average yielding cows. Post-partum conception was 20 days earlier in average yielding cows than high yielding cows. Artificial insemination per conception was similar between average and high yielding cows. Calving interval was 26.9 days longer in high yielding cows compared to average yielding cows. In conclusion, better reproductive and feeding management may help improve the reproductive performance of high yielding dairy cattle in commercial dairy farms.
|
|
|
KEYWORD
|
|
|
Holstein, progesterone, calving interval, conception, estrus
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
|