Fig 1.
Environmental enrichment object.
Environmental enrichment objects hung at the animals’ eye height.
Fig 2.
Interior of the enrichment object with a compartment to store the essence (A) and holes in the plastic tube (B).
Fig 3.
Environmental enrichment object made with jugs attached to the steel structure (A); Animals are interacting with the environmental enrichment object (B).
Fig 4.
Marking the animals with different colors to identify the behaviors listed in the ethogram.
Table 1.
Behavioral ethogram used to assess pigs in growth housed in environments with different environmental enrichment strategies.
Fig 5.
Impact of different environmental enrichment strategies on behaviors of pigs.
SL = sleeping or lying; SB = sexual behavior; ED = eating or drinking; IO = interacting with the object; (Fig 5 data is in S4 File).
Table 2.
Time (min)* and behavioral frequency (%) of pigs in growth in an environment enriched with objects provided using different methods.
Fig 6.
Frequency (%) of animal interaction with the enrichment objects over the six experimental days.
*Consecutive daytime = objects provided for six consecutive days taken away by the end of the afternoon and replaced at dawn. (Fig 6 data is in S5 File).
Fig 7.
Impact of flavored environmental enrichment objects on behaviors of pigs.
SL = sleeping or lying; SB = sexual behavior; ED = eating or drinking; IO = interacting with the object; (Fig 7 data is in S6 File).
Table 3.
Time (min)* and behavioral frequency (%) of pigs in growth in an environment enriched with objects provided using different methods.
Fig 8.
Frequency (%) of animal interaction with the enrichment objects over the six experimental days.
(Fig 8 data is in S7 File).
Fig 9.
Impact on pigs’ behavior in the presence of environmental enrichment objects based on providing rewards.
SL = sleeping or lying; SB = sexual behavior; ED = eating or drinking; IO = interacting with the object; NE = nuzzling or exploring the environment; (Fig 9 data is in S8 File).
Table 4.
Time (min)* and behavioral frequency (%) of pigs in growth in an environment enriched with objects with no reward or with different reward levels (easy or difficult) during the interaction.