پردیس کشاورزی و منابع طبیعی دانشگاه تهران Iranian Journal of animal Science 2008-4773 52 4 2022 01 21 Estimation of financial losses associated with abortion in‏ ‏dairy herds using partial ‎budgeting model ‎ Estimation of financial losses associated with abortion in‏ ‏dairy herds using partial ‎budgeting model ‎ 261 270 86631 10.22059/ijas.2021.325915.653834 FA Hamideh Keshavarzi Ph.D. Graduate in Animal Breeding & Genetics,, Department of Animal Sciences, Faculty of Agriculture, ‎Isfahan University of Technology, Isfahan, Iran‎ Ali Sadeghi-Sefidmazgi Associate Professor in Animal Breeding & Genetics,, Department of Animal Sciences, Faculty of Agriculture, Isfahan University of ‎Technology, Isfahan, Iran‎ Journal Article 2021 06 22 Abortion in dairy cow can be categorized into two types of abortion: Rebreeding (RA, abortion incidence between 60 and 260 d of gestation, without change in lactation number), and new lactation abortion (NLA, abortion incidence after 200 d in gestation which leads to a new lactation). According to this definition, the losses of abortion might be different based on the type of abortion at the herd level. For this purpose, a partial budgeting model was developed to estimate the losses of abortion in 6 Holstein dairy herds located in Isfahan and Chaharmahal-Bakhtiari provinces during 2020. Financial losses due to reduction in productive and reproductive performances, replacement costs and calf loss were considered in this modeling. On average, loss of pregnancy was estimated 27.7 million IRR per case. Although the probability of NLA incidence was much lower than RA abortion (2.3% vs 12.5%), but NLA imposes significant financial losses to farmers (on average 32.4 million IRR vs. 22.0 million IRR per case). In general, decline in fertility was the most crucial factor of losses (63.3%) due to abortion, and decrease in milk yield (22.8%) placed in the second rank. The results obtained in this study can be used by farmers who make the optimal decision to keep or cull the aborted cows in the dairy farms. Abortion in dairy cow can be categorized into two types of abortion: Rebreeding (RA, abortion incidence between 60 and 260 d of gestation, without change in lactation number), and new lactation abortion (NLA, abortion incidence after 200 d in gestation which leads to a new lactation). According to this definition, the losses of abortion might be different based on the type of abortion at the herd level. For this purpose, a partial budgeting model was developed to estimate the losses of abortion in 6 Holstein dairy herds located in Isfahan and Chaharmahal-Bakhtiari provinces during 2020. Financial losses due to reduction in productive and reproductive performances, replacement costs and calf loss were considered in this modeling. On average, loss of pregnancy was estimated 27.7 million IRR per case. Although the probability of NLA incidence was much lower than RA abortion (2.3% vs 12.5%), but NLA imposes significant financial losses to farmers (on average 32.4 million IRR vs. 22.0 million IRR per case). In general, decline in fertility was the most crucial factor of losses (63.3%) due to abortion, and decrease in milk yield (22.8%) placed in the second rank. The results obtained in this study can be used by farmers who make the optimal decision to keep or cull the aborted cows in the dairy farms. https://ijas.ut.ac.ir/article_86631_589f9d6296d0c05ad24dea228425e263.pdf