Title:A bal oldali oltógyomorhelyzetváltozás (OHV) által okozott veszteségek és a műtéti megoldás gazdasági elemzése egy nagy létszámú tehenészetben
SUMMARY The authors quantified the production and economic losses caused by left displaced abomasum (LDA) in a Hungarian 930-cow dairy herd between 1 January 2012 and 31 December 2014. Decision analysis was also performed regarding the profitability of the left flank abomasopexy. Losses were quantified by a partial budget model based on the performance of 178 LDA-positive cows, whereas the postoperative production of 166 cows was included in the decision analysis. The average annual prevalence of LDA was 6.6%, being highest in the first lactation. LDA-positive cows produced 303 kg less milk throughout their lactation and 1339 kg less milk annually than the control group. The LDA significantly deteriorated the cows’ reproduction (p < 0.0001); the calving interval was 58, the lactation 50 days longer, respectively, and the LDA-positive cows required 1.29 more inseminations and additional 57 days to conceive. Average losses related to LDA summed up to 612 EUR per case on average. Increased culling rate was the major source of loss, which caused 42.6% of the losses, followed by the increased mortality (14.2%) and reduced milk yield (14.1%). 9.0% of the cows died after surgery in the affected lactation, 42.2% was culled due to LDA or other reasons and 48.8% remained in the herd at least until drying-off. The decision analysis revealed that 1136 EUR loss could be avoided by the operation compared to immediate culling, hence, the surgery is suggested from an economic point of view.