참고문헌
- Apple K and Craig V. 1992. The influence of pen size on toy preference of growing pigs. Appl. Anim. Behav. Sci. 35: 49-155.
- Berridge KC and Kringelbach ML. 2008. Affective neuroscience of pleasure: Reward in humans and animals. Psychopharmacology 199:457-480. https://doi.org/10.1007/s00213-008-1099-6
- Blackshaw JK, Swain AJ, Blackshaw AW, Thomas FJM and Gillies KJ. 1997. The development of playful behaviour in piglets from birth to weaning in three farrowing environments. Appl. Anim. Behav. Sci. 55:37-49. https://doi.org/10.1016/S0168-1591(97)00034-8
- Burgdorf J and Panksepp J. 2007. The neurobiology of positive emotions. Neurosci. Biobehav. Rev. 30:173-187.
- Day JEL, Kyriazakis I and Lawrence AB. 1995. The effect of food deprivation on the expression of foraging and exploratory behaviour in the growing pig. Appl. Anim. Behav. Sci. 42:193-206. https://doi.org/10.1016/0168-1591(95)93889-9
- Ellegaard L, Cunningham A, Edwards S, Grand N, Nevalainen T, Prescott M and Schuurman T. 2010. Welfare of the minipig with special reference to use in regulatory toxicology studies. J. Pharmacol. Toxicol. Methods 62:167-183. https://doi.org/10.1016/j.vascn.2010.05.006
- Gifford K, Clotier S and Newberry C. 2007. Objects as enrichment: effects of object exposure time and delay interval on object recognition memory of the domestic pig. Appl. Anim. Behav. Sci. 107:206-217. https://doi.org/10.1016/j.applanim.2006.10.019
- Horback K. 2014. Nosing Around: Play in Pigs. Anim. Behav. Cogn. 1:186-196.
- Huntsberry ME, Charles D, Adams KM and Weed JL. 2008. The foraging ball as a quick and easy enrichment device for pigs (Sus scrofa). Lab Anim (NY) 37:411-414. https://doi.org/10.1038/laban0908-411
- Hur CG, Yang HY, Lee EK, Han JH, Park CG, Shin TS, Lee HG, Kang HS, Ahn JD and Cho SK. 2012. Production of Cloned Miniature Pig by Surrogate Mother Conditions. J. Emb. Trans. 27:1-7.
- Hutchinson E, Avery A and Vandewoude S. 2005. Environmental enrichment for laboratory rodents. ILAR J. 46:148-161. https://doi.org/10.1093/ilar.46.2.148
- Jensen MB and Pedersen LJ. 2007. The value assigned to six different rooting materials by growing pigs. Appl. Anim. Behav. Sci. 108:31-44. https://doi.org/10.1016/j.applanim.2006.10.014
- Kanitz E, Tuchscherer M, Puppe B, Tuchscherer A and Stabenow B. 2004. Consequences of repeated early isolation in domestic piglets on their behavioural, neuroendocrine and immunological responses. Brain Behav. Immun. 18:35-45. https://doi.org/10.1016/S0889-1591(03)00085-0
- Lutz CK and Novak MA. 2005. Environmental enrichment for nonhuman primates: theory and application. ILAR J. 46: 78-191.
- Munsterhjelm C, Valros A, Heinonen M, Halli O, Siljanderasi H and Peltoniemi OA. 2010. Environmental enrichment in early life affects cortisol patterns in growing pigs. Animal 4:242-249. https://doi.org/10.1017/S1751731109990814
- Newberry RC. 1995. Environmental enrichment: increasing the biological relevance of captive environments. Appl. Anim. Behav. Sci. 44:229-243. https://doi.org/10.1016/0168-1591(95)00616-Z
- Smith AC and Swindle MM. 2006. Preparation of swine for the laboratory. ILAR J. 47:358-363. https://doi.org/10.1093/ilar.47.4.358
- Smith ME, Gopee NV and Ferguson SA. 2009. Preferences of minipigs for environmental enrichment objects. J. Am. Assoc. Lab. Anim. Sci. 48:391-394.
- Telkanranta H, Swana K, Hirvonenb H and Valros A. 2014. Chewable materials before weaning reduce tail biting in growing pigs. Appl. Anim. Behav. Sci. 157:14-22. https://doi.org/10.1016/j.applanim.2014.01.004
- Van de Weerd A, Docking M, Day L, Avery J and Edwards A. 2003. A systematic approach towards developing environmental enrichment for pigs. Appl. Anim. Behav. Sci. 84:101-118. https://doi.org/10.1016/S0168-1591(03)00150-3