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Investigation and Prevention of Reproductive Disorders in Postpartum Dairy Cows (II)
According to the investigation in 2006, it was reported that bovine reproductive disorders, mastitis and lameness were still the 3 major problems of dairy cows in Taiwan. Indeed, the infertility problem played especially an important role of cow culling. Cystic ovarian disease remains a common and costly reproductive disorder of dairy cows. Incorrect differentiation of ovarian cysts followed by inappropriate treatment is a problem in the field. Many cows suffering from ovarian cysts administered with an inaccurate hormone therapy may increase their open days and are culled finally by the owners. The aim of this study this year is designed to investigate the ovarian diseases in postpartum dairy cows. The effect of different hormone therapy on ovarian cysts will be investigated in order to make the dairy clinicians aware of the accurate medical intervention and to improve the postpartum fertility of the dairy cows. The preliminary results indicated that ultrasonography has determined 23 cases for follicular cysts and 8 for luteal cysts in postpartum dairy cows. All 31 cows returned to a normal estrus cycle after treatment with either GnRH or Prostaglandin, with 24 cows (77.4 %) becoming pregnant. Further work is therefore necessary to amplify the sample size for establishing a better model of prevention as well as treatment of ovarian dysfunction in the postpartum dairy cows.
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