| Summary: | There are several environmental and ambient factors that can affect pig eliminative behaviour. The aim of this survey was to investigate factors related to the physical and ambient environment that have the strongest effects on pig and pen cleanliness and ammonia concentration. Data were collected from 87 pig farms and analysed using mixed (ammonia concentration) or generalized linear (pen and pig cleanliness) model in SAS. The pen was cleaner when pen partitions were open compared to closed (<i>p</i> = 0.010) and increased with increasing amount of litter (<i>p</i> = 0.002), using straw (<i>p</i> = 0.002) as rooting material. Pig cleanliness was higher when pen partitions in the eliminative area were open compared to closed (<i>p</i> = 0.007) and increased with increasing space per pig in the resting area (<i>p</i> < 0.001), with decreasing temperature (<i>p</i> < 0.001), and lowering of air velocity (<i>p</i> = 0.003). Other factors that increased cleanliness was using straw as rooting material (<i>p</i> = 0.028) and increasing amount of litter in the resting area (<i>p</i> = 0.002). Ammonia concentration was reduced with increasing floor space in the eliminative area (<i>p</i> < 0.001) and increasing amount of litter (<i>p</i> = 0.006). Our results pinpoint physical and ambient conditions affecting pen and pig cleanliness and air quality.
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