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Dystocia is an economically important problem in the cattle industry because it is a major causes of calf mortality. This problem has received increased attention by the cattle industry because of the utilization of some of the incompetible sire breeds in crossbreeding programs. The aim of this study was to investigate the effect of year and season on cattle dystocia using poisson regression methodology. Only first-calf heifer data record, including a total of 1787 birth records over threedoi:10.1501/vetfak_0000002605 fatcat:plqadbyygve4tdiu5szdcfy6dq