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- W1997778470 abstract "Abstract The illumination preferences of pigs have been examined by placing individual animals in light-proof chambers in which they could turn the lights on or off by interrupting an infrared beam switch with their snouts. The pigs were tested, on separate occasions, at two light intensities; bright (110 lux) and dim (10 lux). During 24-h periods, pigs spent an average of 54% of the time with the lights on when they were in bright light. When tested in dim light they spent an average of 63% of each 24 h with the lights on. Their motivation to obtain light was investigated using operant tests in which pigs, in darkness, obtained 40 s of light for interrupting an infrared beam. They obtained 1.5–2 h of light per 24 h. By contrast, pigs in continuous light would not operate the beam switch to obtain 40-s periods of darkness." @default.
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- W1997778470 date "1985-09-01" @default.
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- W1997778470 title "Illumination preferences of pigs" @default.
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- W1997778470 doi "https://doi.org/10.1016/0168-1591(85)90004-8" @default.
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