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This thesis examines questions concerning the place of animals within our moral thought. In particular it is an investigation of the rationale behind extending our ethical systems to encompass the inclusion of animals. The thesis begins with a presentation of a general framework defining rights and their relationship to obligations. It then includes an assessment of whether or not animals, according to the general framework, can properly be called rights bearers. In order to do this, the questions of whether or not animals have value independent of their value to human beings and whether or not animals have interests are examined. / Though the thesis concerns itself with animals it is not merely an examination of animal rights. In order to investigate fully the place of animals within our moral thought, many concepts which are central to ethics such as "rights", "equality", "value", and "affinity" are examined. The thesis concludes with the implications its findings have on human actions.

This thesis moves beyond the traditional approaches of how we ought to treat animals, and instead concentrates on the best strategy for preventing animal suffering in the farming industry. Chapter 1 considers the question of how we can know that animals feel pain, and concludes not only that it is rational to believe that they can, but also that this is a significant fact. Chapter 2 then analyses one possible strategy for helping to prevent animal suffering, namely demi-vegetarianism. For a number of reasons, however, this strategy is found to be flawed, therefore Chapter 3 analyses a second possible strategy, namely vegetarianism, and concludes that this is, in fact, the best strategy for helping to prevent animal suffering in the farming industry.