2.1. Census data
The 2007 X-ray survey dataset contained the number of birds and number of holders in every sub-district(administrative level 3) of Thailand. More recent data were available, but 2007 was the last year when the distinctions were made among the 8 major classes of poultry. These included 3 types of chicken-broilers, layers, andThai indigenous chickens (native); and 5 types of ducks-meattyped (MTD), egg typed (ETD), Muscovy (MD), meat typed free-grazing ducks (MTFGD), and egg typed free-grazing ducks (ETFGD). In subsequent years, some of these categories were pooled. Data were available for a total of 7410 sub-districts with a median size of 16 km2. For each of these types, the respective number of holders was also known. Fig. 1 ofthe Supplementary information (SI) shows the relative composition of the chicken and duck sectors in 2007.Fig. 1 shows the spatial distributions of four of these categories.
2.1. Census dataThe 2007 X-ray survey dataset contained the number of birds and number of holders in every sub-district(administrative level 3) of Thailand. More recent data were available, but 2007 was the last year when the distinctions were made among the 8 major classes of poultry. These included 3 types of chicken-broilers, layers, andThai indigenous chickens (native); and 5 types of ducks-meattyped (MTD), egg typed (ETD), Muscovy (MD), meat typed free-grazing ducks (MTFGD), and egg typed free-grazing ducks (ETFGD). In subsequent years, some of these categories were pooled. Data were available for a total of 7410 sub-districts with a median size of 16 km2. For each of these types, the respective number of holders was also known. Fig. 1 ofthe Supplementary information (SI) shows the relative composition of the chicken and duck sectors in 2007.Fig. 1 shows the spatial distributions of four of these categories.
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