| Summary: | Mapping slaughterhouse supply zones is crucial for assessing cattle concentration, environmental impact, and promoting sustainable practices. This study combines cattle transit records (GTA in Portuguese) with rural property boundaries (CAR in Portuguese) to map these zones in the Brazilian Amazon. It evaluates the influence of Zero-Deforestation Cattle Agreements (CA) and explores the overlap between CA and non−CA slaughterhouse supply zones. Results reveal that CA slaughterhouse supply zones significantly impact forest preservation and cover a large area equivalent to entire municipalities. Over two-thirds of the study region, including most non-protected areas, falls within these zones. There is a high degree of overlap (95%) with non−CA supply zones, indicating competition for suppliers and limited expansion potential for CA. Direct and indirect suppliers are located nearby, with approximately 80% of indirect suppliers within 100 km of direct suppliers. Consequently, supply zones for both types of suppliers largely overlap. These findings demonstrate that assessing slaughterhouse deforestation risk for the entire supply chain in our study region can be achieved by mapping only the direct suppliers. This research provides valuable insights into cattle concentration, the effectiveness of zero-deforestation commitments, and the need for sustainable practices in the slaughterhouse industry.
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