stables (yes/no),
type of bedding (pasture/ground/concrete/wood chips) and perimeter fence(yes/no).
In reference to the variable “ventilation”, itdepended on the variable absence of housing in the nextway: when there was no housing the ventilation wasconsidered always as good. By contrast, it was consid-ered a bad ventilation when inside the houses an odourof ammonia was detected.