testing influence of injection oxytocin and prostaglandin f2α in process of uterus contraction and indexes of dairy cow fertility after parturition

the purpose of present study is testing influence of injection oxytocin immediately after parturition and injection prostaglandin f2α, 20 to 25 days after parturition in dairy cows upon process of uterus contraction distance between delivery till first estrus distance between parturition till first and second semenation, amount of pregnancy at first semenation and number of semenation for every pregnancy. in this study 30 holeshtain dairy cow are used in 2 group of 15 (treatment and control group). treatment's group received 10cc oxytocin immediately after parturition and 5cc prostaglandin f2α, 20 to 25 days after parturition. the result statistically using chi sequare and t student test were analyzed with spss. the result shows a meaning full difference (p≥0/05) in uterus contraction, amount of pregnancy at first semenation and number of semenation for every pregnancy between treatment and control group. there is a noticeable improvement in percent of pregnancy for treatment group (47/1percent for treatment group and 23/5percent for control group). the result also shows that injecting oxytocin immediately after parturition and prostaglandin f2α 20 to 25 days later can hare positive increase in amount of future fertility in dairy cow and also it can decrease economical loss in cow herd. this result can show connection of contraction influence of oxytocin and prostaglandinf2α in myometriom layer of uterus to enjection secrection and early contraction of ovary activity.