The relationship between subclinical ketosis and periparturient disorders in dairy cattle in Shahrekord

This study was carried out to determine the prevalence of subclinical ketosis and relation to periparturient disorders in dairy farm in Shahr-e-kord. A total of 20 multiparous Holstein cows (parity 2-9) were randomly selected from 5 commercial dairy herds. Since the likely risk time for occurrence of ketosis is during 2-5 weeks after parturition, the blood samples were taken wk 1 before calving and at wk 2 and 3 after calving. From 3 weeks before calving to 3 months after calving, peripartum diseases informations including milk fever, metritis, mastitis, clinical ketosis, displaced abomasum, retained placenta, dystocia, pneumonia and lameness were gathered in data sheet form. Beta-hydroxy butyrate was measured in serum by using automated analyzer and statistical analysis was performed to investigate the prevalence of ketosis (clinical and subclinical) and related periparturient diseases. The prevalence of subclinical ketosis, using cut-off 1200 μmol/lit of beta-hydroxy butyrate was 0.98 in wk 1 before, 9.8 in wk 2 and 13.79 percent in wk 3 after parturition respectively. It was shown that there is a significant correlation between subclinical ketosis and left displacement of abomasum, metritis and mastitis, separatively so that the odds ratio of each disease was 9.74, 4.26 and 6.64 respectively.