Studies on the Visual Acuity of Pigs Using Shape Discrimination Learning

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  • TANAKA Toshio
    School of Veterinary Medicine, Azabu University
  • MURAYAMA Yumi
    School of Veterinary Medicine, Azabu University Training Farm, National Federation of Livestock Agriculture Cooperative Associations
  • EGUCHI Yusuke
    School of Veterinary Medicine, Azabu University
  • YOSHIMOTO Tadashi
    School of Veterinary Medicine, Azabu University

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  • 図形識別学習法によるブタの視力測定
  • Studies on the Visual Acuity of Pigs Us

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Abstract

The objective of this study was to determine the visual acuity of pigs. Six pigs were trained to discriminate between a Landolt ring and an ordinary ring of equal size associated with feed. The left and right positions of the 2 targets were shifted according to the Gellermann series. After the pigs were fully trained, their visual acuity was determined by changing the size of the rings or the distance from the target. The pigs were subjected daily to 1 or 2 sessions which consisted of 30 trials each. The criterion of successful discrimination was 3 consecutive sessions with more than 21 correct choices (P⟨0.05, Chi-square test). Two castrated pigs were not able to learn the experimental procedure. The best scores of visual acuity in the 4 female pigs were 0.017, 0.034, 0.035 and 0.07.

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