Comprehensive analysis of biosecurity practices and antimicrobial use in broiler chicken production by integrated operations in Korea.

Integrated broiler operations that allow producers to combine various biosecurity and sanitation practices account for approximately 97.6% of chicken meat production in Korea, but it is not well known about the biosecurity level or compliance with regulations for each operation. Therefore, the objective this study was to analyze the current adoption of biosecurity practices and trends in antimicrobial use in 74 farms from 5 major integrated broiler chicken operations (A-E). The highest stock densities of more than 65 birds per 3.3 m (0.5 birds/ft) showed in 66.7 and 33.3% of the farms in operations A and C, respectively. Also, the livability rate of 98% or less was observed in 73.3 and 93.4% of the farms, in operation A and C, respectively, which lower than other operations. Moreover, it was observed that 60.0 and 40.0% of farms in operations B and C reused litter 3 or more times. Among the 74 farms, the most common antimicrobials prescription frequency was 2 times (39.2%), and the prescription to β-lactams antibiotics (45.3%) showed the significantly highest (P < 0.05). The highest administration of antimicrobials was at 15 to 22-days old (42.7%), and most of them were recommended by veterinarian (80.7%). Footbath disinfectant and spraying outside the poultry house were performed in most of the farms (64.9 and 83.8%, respectively), but the use of quicklime (36.5%) and drinking water disinfectant (18.9%) was low in farms. Most of the farms washed vehicles for transportation of poultry (87.8%) and feed (100%) before arriving at the farms, however, 40.5% of the farms used little or no disinfectants when washing the transport vehicles. Moreover, wild birds, and cats and dogs were well controlled on most of the farms (each 94.6%), but only 74.3% of farms offered rodent control programs. Also, only 27.0% of the farms used farm-specific shoes and clothing as well as footbath disinfection for entrance. These findings can be useful in developing policies and guidelines for sustainable and responsible broiler chicken production and reduction of antimicrobial use in Korea.