What is the first transgenic animal?

The first transgenic animal is widely recognized as a mouse that was genetically modified to express a foreign gene in 1980. This groundbreaking achievement not only marked a significant milestone in genetic engineering but also paved the way for the development of numerous transgenic models across various species. The techniques established through this initial work have since been refined and applied to create a wide array of transgenic animals, including livestock and other species used in biomedical research.