Survey on fertility of retained placenta and abomasal displacement cows after single or twin births in dairy cows in Korea / 대한수의학회지

ABSTRACT

Calving records of Holstein dairy cows from 2005 to 2010 comprising Goyang and Paju cities herd with 2,362 calving events representing 240 twin births were used to evaluate the effect of abomasal displacement and retained placenta after single or twin births on fertility. In retained placenta cows, the period of twin pregnancy (mean 270.5 days) was shorter than that of single pregnancy (mean 274.8 days), however first artificial insemination period (twin mean 107.4 days, single mean 92.0 days), non-pregnant period (twin 154.8 days, single 132.2 days), and number of insemination (twin mean 2.00 times, single mean 1.87 times) of twin pregnancy were increased as compared with single pregnancy. In abomasal displacement cows, first artificial insemination period (twin mean 122.9 days, single mean 106.0 days), non-pregnant period (twin 172.4 days, single 152.0 days), and number of insemination (twin mean 2.16 times, single mean 1.89 times) of twin pregnancy were increased as compared with single pregnancy. The prevalence of complication such as retained placenta, abomasal displacement with single or twin births increased first artificial insemination period, non-pregnant period, and number of insemination period.