References

1. Duncan, I.J.H. Feelings of Animals. In Encyclopedia of Animal Rights and Animal Welfare; Bekoff, M., Meaney, C.A., Eds.; Greenwood Press: Westport, CT, 1998.

2. Broom, D.M.; Johnson, K.G. Stress and Animal Welfare; Kluwer Academic Publishing: Amsterdam, 1993.

3. Duncan, I.J.H.; Dawkins, M.S. The Problem of Assessing ''Well Being'' and ''Suffering'' in Farm Animals. In Indicators Relevant to Farm Animal Welfare; Smidt, D., Ed.; Martinus Nijhoff Publishers: Boston, 1983.

4. CAST. The Well being of Agricultural Animals; Curtis, S.E., Ed.; Council on Agricultural Science and Technol ogy: Ames, IA, 1997.

5. Curtis, S.E.; Widowski, T.M.; Johnson, R.W.; Dahl, G.E.; McFarlane, J.M. Environmental Aspects of Animal Care; Blackwell Publishing Professional: Ames, IA, 2005.

6. The Biology of Animal Stress: Basic Principles and Implications for Animal Welfare; Moberg, G.P., Mench, J.A., Eds.; CABI Publishers: New York, 2000.

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