Consideration the relationship between sub fertility and its predisposing factors in the referral cows of Veterinary Hospital of Shahid Chamran University of Ahvaz

Infertility is one of the main causes of economic losses and also affects the reproductive performance in dairy farms. The aim of this study was to consider the factors affecting infertility in dairy cows. The information, including nutritional status, parities, parturition, calving season, retention of placenta and metritis, was collected from the case of the referred cows to the Veterinary Hospital  of Shahid Chamran University of Ahvaz. Data analysis was performed using logistic regression and chi-square tests. The chance of a normal parturition for cows used a proper diet was 5.020 times more than of poorly fed cows (p<0.05).The effect of dystocia and placental retention on metritis was also significant (p<0.05). The chance ratio for metritis in cow with dystocia at parturition time compared to cows with normal parturition was 31.419. Also, this ratio for cows with retained placenta compared to normal cows was 1.377. Prevention the predisposing factors such as poor nutrition, dystocia, retention of placenta and metritis complex, even in native cows, can play a significant role in reducing infertility in dairy cows.