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. 2017 Oct 24;12(10):e0187057. doi: 10.1371/journal.pone.0187057

Table 1. Main categories and information within each category recorded in the survey questionnaire.

Main categories Information recorded
1. Participants information address, phone number, e-mail and website information
2. Farm and flock characteristics number of farms owned, breed of hen, number of flocks housed per year, average flock size, total number of hens/farm, the range and its components, range access, climatic conditions
3. Housing and feeding climate control, feeders and drinkers, feed characteristics, nesting
4. Rearing and production pullet rearing, laying hen performance
5. Health and welfare mortality rate, cause of mortality, most prevalent disease, parasites, frequency of veterinarian visits
6. Biosecurity biosecurity measures practiced on farm
7. Manure management vegetative cover and water bodies, manure and surface run-off management
8. Factors influencing free-range farming reasons for adoption of this type of farming, anticipated years in operation, support system, skill base, access to scientific knowledge, areas priortised for research.