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There is a growing consensus that improving market access for smallholder farmers will help them earn more income and enhance food security. In this respect, we employed system dynamics approach to evaluate interventions to expand market access for the traditional system dairy producers in West Shewa zone, Oromia region, Ethiopia. Investment by dairy cooperatives in milk collection capacity and/or raising the price of milk for producers are the interventions identified in the study. These interventions were assessed ex-ante for impacts on (1) milk collection and dairy enterprise balance for dairy cooperatives and (2) milk production and profitability of dairying for producers. Analysis results show that compared to the baseline, the interventions can increase milk production by 17 to 57 %, milk collection by 24- to 43-fold, dairy household's profit by 11- to 21-fold, and cooperatives' dairy enterprise balance by 27- to 55-fold. In the long-term, both dairy cooperatives and producers are better off under market access improvement than under market access with higher milk price for producers. The findings suggest that continued improvement in market access for the traditional dairy farmers in Ethiopia is necessary to sustain higher gains in milk production, milk marketed, and income from dairying., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Milkessa Temesgen reports financial support was provided by 10.13039/501100004535Ethiopian Institute of Agricultural Research., (© 2024 The Authors.)

Despite having a larger herd size and a favourable climate, Ethiopia generally lags behind developing nations in terms of both production and consumption of dairy products. For the purpose of finding and assessing ways to increase milk production by the traditional dairy system in Ethiopia's West Shewa zone, we integrated system dynamics (SD) modelling with a participatory model building approach. The main objective of the research was to develop SD model for West Shewa dairy value chain and apply it to assess ex-ante milk production and dairy household profit impacts of various interventions. The interventions evaluated in the study include enhanced urea treatment of crops residue, increased production of improved feed, and investment in more dairy cows. Analysis reveals that policies targeting feed development can boost milk production and household profits above the baseline. They also lead to a higher seasonal variability in milk production. Through the feed development strategy producers can achieve a 70 % and 735 % increase in milk production and household profit, respectively. However, the implementation of improved feed policy still leaves a gap in the average feed protein requirement of a dairy cattle in the study area. On the other hand, policy of increasing cow herd is not profitable. In addition, improved feed policy in drought results in reduced herd size, yet it leads to a higher milk output and household profit. Hence, with the feed development options explored in this study, increasing herd size is not a recommended course of action for improvement of the West Shewa dairy value chain. Therefore, future research should explore for further enhancement of the supply as well as quality of feed resources and the potential of investment in improved breeds., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Milkessa Temesgen reports financial support was provided by 10.13039/501100004535Ethiopian Institute of Agricultural Research., (© 2023 The Authors.)