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Application of zona-free cloning technologies to livestock breeding programmes
Muren Herrid1, Alison Van Eenennaam2
1International Livestock Research Centre, Gold Coast, QLD 4211, Australia.
Animal Reproduction Science
|January 30, 2026
Summary
Zona-free cloning offers a simpler, scalable alternative to traditional methods for producing cloned livestock. This technique improves efficiency and birth rates, making it vital for livestock breeding programs.
Area of Science:
- Animal Science
- Reproductive Biology
- Biotechnology
Background:
- Advanced reproductive technologies accelerate genetic gain in livestock.
- Somatic cell nuclear transfer (SCNT) cloning multiplies elite genetics.
- Genomic estimated breeding values identify elite young stock for cloning.
Purpose of the Study:
- To review advances in zona-free cloning methods.
- To evaluate the advantages and limitations of different zona-free techniques.
- To discuss cloning applications, health, welfare, and regulations in livestock breeding.
Main Methods:
- Review of zona-free cloning techniques (microblade, two-pipette, micropipette).
- Evaluation of pregnancy and live birth rates.
- Examination of clone health, welfare, and regulatory considerations.
Main Results:
- Zona-free cloning shows promising improvements in pregnancy and live birth rates.
- Simpler, scalable methods offer advantages over conventional micromanipulator-based cloning.
- Continued optimization is needed to address efficiency and cost constraints.
Conclusions:
- Zona-free cloning is a key technology for livestock improvement.
- Cloning complements gene editing for generating elite breeding animals.
- Further development is essential for widespread application in livestock breeding programs.
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