2Tanida H, Miura A, Tanaka T, et al. Behavioral responses of piglets to darkness and shadows[J]. Applied Animal Behav- iour Science, 1996, 49:173-183.
3Koba Y, Tanida H. How do miniature pigs discriminate be tween people? Discrimination between people wearing coveralls of the same colour[J]. Applied Animal Behaviour Science, 2001, 73: 45-58.
4Johan J Z, Linda Cornelissen, Maaike Wolthuis Filler, et al. Visual acuity of pigs at different light intensities[J]. Applied Animal Behaviour Science, 2008, 111: 28-37.
5Edge H I., Varley M A ,Rowlinson P. The effect of trough colour on the voluntary food intake of postweaned pigs a shortcommunication[J]. Livestock Production Science, 2004, 88: 193 197.
6Stelios G,Kostas Karalis D,Georgios kanzouros. The influence of drinker location and colour on drinking behaviour and water intake of newborn pigs under hot environments[J]. Applied Animal Behaviour Science, 2006, 96 : 233-244.
7Robde P K A, Gonyou H W. Attraction of newborn pigs to auditory, visual, olfactory and tactile stimuli[J]. Applied Ani- mal Behaviour Science, 1991, 66:2 165-2 173.
8Rogerio G T, da Cunha. As good as it sounds-understanding piggish[J].Pig Progress,2006,22(8) : 13-15.
9Horrell I, Hodgson J. The bases of sow-piglet identification cues used by piglets to identify their dam and home pen[J].Applied Animal Behaviour Science, 1992, 33: 329-343.
10Blackshow J K, Jone D N,Thomas F J. Vocal individuality during suckling in the intensively housed domestic pig[J]. Applied Animal Behaviour Science, 1996, 50:33-41.