Evaluation of fertility parameters in dairy COWS suffered from LEFT displaced abomasum

In the present study, it was aimed to reveal the effect of left displaced abomasum (LDA) on some fertility and yield parameters in Holstein dairy cows. Experiment group (n = 66) in which LDA was diagnosed and treated by surgery, was chosen from a total of 254 primiparous or multiparous cows in 1,74 ± 0,05 lactation number on average, whereas the cows diagnosed as healthy were the control group (n = 188). There was no significant difference in terms of male calf and twin births, whereas female birth rate was lower and still birth rate was higher in the experiment group than those detected in the control group (p < 0,01). The rate of placental retention, clinic mastitis and metritis did not show any significant difference between groups, whereas the average concentrations of blood β-HBA were higher in the experiment group (p < 0,01). Lactation number (p < 0,01), calf gender (p < 0,05), stillbirth (p < 0,05) and subclinical ketosis (p < 0,001) were the risk factors. The present study in which artificial insemination (AI) was performed at Ovsynch, Double Ovsynch protocols or standing heat, the pregnancy rates obtained from first AI did not differ between groups. The pregnancy rates obtained from Ovsynch protocol was higher than other protocols in the control group (p < 0,01). The total pregnancy rates after first AI in the experiment group were lower than those detected in the control group (p < 0,001). The overall results showed that the average number of AI per pregnancy (p < 0,01) and the calving pregnancy interval (p < 0,001) in the experiment group was lower than those detected in the control group, whereas pregnancy rates were lower (p < 0,05). The average first postpartum (pp) 100 days and lactation milk yield in the experiment group were lower than the milk yield in the control group (p < 0,001). It was observed that the duration of drying-off (p < 0,05) and culling (p < 0,01) in the experiment group were longer and the culling rate was higher than those detected in the control group (p < 0,001). Keywords: LDA, Ovsynch, Double Ovsynch, Pregnancy, Fertility, Cow, Milk Yield