Document Type : Original Article


1 Department of Food Hygiene and Quality Control, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.

2 Department of Food hygiene and quality control, Faculty of Veterinary Medicine, University of Tehran

3 Department of Theriogenology, Faculty of Veterinary Medicine, University of Tehran

4 Department of Internal Medicine and Clinical Pathology, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran.


The interval between parturition and the subsequent pregnancy is called Days Open or Calving to Conception Interval, which is affected by several factors, especially dystocia. Dystocia is abnormal or difficult calving for any reason necessary to help parturition through Labor.
This study is a health education field trial. For this purpose, the research team created a comprehensive training program for farmers. Then, several classes took place for farmers and tried to train them about the normal process of parturition in dairy cows and when/how must be needed to help in parturition or dystocia. Collectively, 486 multiparous dairy cows were covered in our study; 173 belonged to the trained farms (educated farmers) and 313 to the control farms (not educated farmers). Despite dystocia was lower than in the educated group but retained placenta had no significant differences between the two groups; meanwhile, cows in the educated group were a better conception rate (lower service per conception) in the following parturition. Therefore, days open medians in the cows of the trained farmers were significantly lower than in other farmers (85-days vise and versa 120-days respectively). Cox regression analysis showed that uterine prolapse, retained placenta, and dystocia could significantly impact the subsequent pregnancy. Dystocia affects days open, and training about parturition and dystocia management can effectively decrease the days open in dairy cows.


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