Many traits are significantly influenced by genetic factors. Genetic modification is nothing new — humans have been selectively breeding animals and plants for thousands of years. However, recent developments, including gene editing (e.g. CRISPR) and gene drives – as well as the potential of AI to accelerate further research – raise pressing questions about the welfare implications of these tools. These questions are not simple: genetic interventions may reduce animal suffering in some contexts and exacerbate it in others, and their effects often interact with broader systemic factors — including farming conditions, regulatory oversight, and the viability of non-genetic alternatives. This week, we survey the current landscape of genetic modification in animals, examine the evidence for and against various applications, and develop a principled framework for evaluating when — and whether — genetic interventions are warranted.

🧩 Central questions

1. Advances in genetic modification: How do the different major techniques of genetic modification work, and what are their advantages and disadvantages?
2. Genetic vs. non-genetic approaches to improve animal welfare: Which considerations might favour genetic interventions to improve welfare over non-genetic strategies (e.g. improving factory farming conditions; food system transformation)?
3. The ethical gradient: What key considerations govern the acceptability of genetic editing across farmed animals, wild animals, and humans?

🧭 Learning objectives

1. Understand: Explain in basic terms how both genetic and environmental factors contribute to trait development in sexually reproducing organisms, and differentiate major methods of genetic modification, including selective breeding, somatic vs. germline gene editing, and gene drives.
2. Assess: Critically interrogate personal intuitions and apprehensions about genetic interventions to improve welfare. Evaluate ****core ethical arguments for and against genetic interventions across different animal populations (e.g. farmed, wild).
3. Reason: Develop a principled stance on the most promising and hazardous applications of gene editing in animals. Compare and contrast genetic vs. non-genetic strategies to improve animal welfare.
4. Next steps: Identify key organizations, contacts, and areas for further investigation into genetic welfare.

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Use the table of contents on the right to quickly navigate this page.

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Resources

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A note on responsible engagement

Genetic welfare is a sensitive and high-stakes topic. This session is designed to help us explore these complex issues with clarity and charity. To this end, we ask you to approach these resources and discussions with a balanced and objective mindset:

• Read and reflect: Treat your “gut reaction” as the start of an analysis – not the end.
• Steelman, don’t strawman: Respond to the strongest possible version of an argument you disagree with, not a caricature. Be wary of hyberbole and sensationalism.
• Acknowledge uncertainty: Recognize that it can hard to predict the impact (whether positive or negative) of many interventions (whether genetic or non-genetic). Strive for intellectual humility.
• Benchmark alternatives: Compare the risks, costs, and benefits of specific genetic methods against each other and also against non-genetic welfare solutions.
• Shared stewardship: Outside our structured fellowship environment, the risk of misunderstanding is high. Exercise discretion about where and how you discuss these ideas. Frame the conversation with nuance and humility; and be aware of potential misconceptions. </aside>

Required readings

Key concepts

Genetic modification in animals

Genetic interventions for farmed animal welfare: the near-term

Knocking Out Pain in Livestock: Can Technology Succeed Where Morality has Stalled? (available open access here)

Further readings (optional)

Pre-session exercises

Please spend 20-30 minutes completing these two exercises.

• You can write your responses in bullet point format if that’s easier.
• Submit your responses in the weekly Slack thread created by your facilitator in your channel at least 24 hours before your regularly scheduled meeting.
• Leave at least one comment on somebody else’s response.

Case studies in animal genetic editing

[150 words] Research and find an example of an animal genetic intervention (e.g., a news article, a research publication, a website, blog or forum post, etc.). Be prepared to present your example in small groups, explaining:

1. Which animal does this affect?
2. What is the trait being modified, and what “problem” does this solve? (e.g. engineering cattle to grow shorter hair so that they can withstand hotter climates)
3. Is the intervention explicitly designed to improve animal welfare? Is it welfare-positive?
   1. If yes, explain the rationale. (e.g. “Yes. Enhanced disease resistance would reduce suffering from disease symptoms and antibiotic side effects.”)
   2. If no, anticipate potential harms that might arise.