Evaluation of the relationship between postpartum Body Condition Score reduction, season and parity on the incidence of clinical mastitis in dairy cattle

Negative energy balance, which usually occurs in transitional period, can have important implications for livestock life such as reduction in body condition score. The aim of this study was to determine the relationship between the rate of Body Condition score reduction, season and parity with the occurrence of clinical mastitis in the first weeks of postpartum period in one of the Fars province farms and it was conducted on the 1613 dairy cattle.For each cow BCS, the status of mastitis and the number of infected quarter was evaluated according to the parity and delivery season at two times, he first time being 2 or 3 days before calving and the second time approximately one month after that (30±3 day). Finally, the results were analyzed using SPSS software and chi square test.Results showed that the occurrence of clinical mastitis was significantly affected by BCS and the parity. As further decrease in the BCS, increases the incidence of clinical mastitis and increasing the parity is associated with anincrementin the incidence of clinical mastitis, But the effect of the season on this complication was not significant.% (p>0.05).