Few people question the basis of their moral viewpoints, yet if science is to be applied ethically it is necessary to subject these viewpoints to rational analysis. The paper provides an overview of prominent ethical theories (deontological and consequentalist) and their impact on novel and prospective animal biotechnologies. These theories are applied to the principles of: autonomy, justice, nonmaleficence and beneficence in relation to the interests of animals, the environment and humans.

Deontological approaches include ‘rights’-based theories (often derived intuitively or from scriptural sources) and ‘contractualist’ theories, dependent on an ‘unwritten contract’ between rational beings to ensure fairness. For consequentialists (eg utilitarians), it is the outcome of actions that determines their ethical value. Few people, consciously or unconsciously, consistently employ a single ethical theory, but there is often much concordance between actions based on the different theories. Except for some intuitionists, ethicists emphasise the role of rationality in ethical theory; for even though intuition is an important element, many consider that universalizability of ethical theories entails the establishment of a ‘reflective equilibrium’