World Organization for Animal Health (OIE) recommends member countries to comply with global standards of animal welfare. The present study was conducted to reveal the compliance of animal welfare standards in slaugh- terhouses in Tehran province (Iran). The following three major parameters were evaluated through direct observation, study of plant records, and interviewing slaughterhouse staff across all 14 operative animal slaughter- houses in Tehran province: (1) employing trained and committed workers; (2) appropriate environment and proper design parameter; and (3) proper construction, equipment, and tools. Only 30% of modern slaughterhouses employed trained personnel for handling livestock in an appropriate way, which reaches zero for traditional slaughterhouses. Regarding electrical stunning application for sheep, animal welfare quality was significantly greater in modern slaughterhouses than in the traditional ones (P < 0.05). Out of nine slaughterhouses with unloading platforms and animal lairage, 55% and 35.7% were found to comply with standards, respectively. Concerning lairage parameters and entrance hall, modern plants stood higher compared to traditional slaughterhouses (P > 0.05). It is recom- mended training courses for involved veterinarians and slaughterhouse staff along with upgrading slaughterhouse construction.

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