Nagekeo Regency, East Nusa Tenggara, is a beef cattle production centre with 47,218 cattle and 9,540 farming households, yet its contribution to national food security is constrained by inter-island supply chain inefficiencies rooted in institutional coordination failure. This qualitative study, based on 13 respondents, aimed to analyse the institutional structure using the Food Supply Chain Network (FSCN) approach, measure operational performance using the Supply Chain Operations Reference (SCOR) model, and assess distribution efficiency through marketing margin and farmers' share analysis. Data were collected via snowball sampling, in-depth interviews, Focus Group Discussions, and field observation during May–July 2025, triangulated with official quarantine and port documents. The supply chain operates through two channels: a local channel (farmer's share 82.6%, 1–3-day cycle) and an inter-island channel (farmer's share 75.4%, 21–28-day cycle). SCOR performance showed good reliability (90–98%) but weak responsiveness attributable to vessel scheduling constraints rather than actor inefficiency. Collector operational costs reached approximately IDR 452,000 per head across 12 components, dominated by holding and quarantine feed costs (46.5%). Four critical findings were identified as manifestations of institutional coordination failure: duplication of Rose Bengal Test screening, unregulated transfer of test-tube costs to traders, mismatch between minimum weight regulation and market demand, and unformalized port charges. This study contributes by demonstrating that the integrated FSCN–SCOR–margin framework detects institutional inefficiencies unidentifiable by single frameworks, and that eliminating one of these institutional costs alone, the informal RBT test-tube pass-through, raises inter-island farmer's share from 75.4% to approximately 75.5%, indicating that further, low-cost institutional reform offers a viable, if modest, path toward the 80% farmer's share level conventionally cited as a reference point in the Indonesian marketing literature, rather than a formally validated efficiency benchmark.
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