To isolate mitochondrial DNA for sequencing the bovine mitochondrial genome, various tissue types can be used. The choice of tissue for isolating mitochondrial DNA depends on the specific research objectives and the availability of the samples. Skeletal muscle is a rich source of mitochondria and is often used for isolating mitochondrial DNA. The liver is another organ with a high mitochondrial content, and it can be used for isolating mitochondrial DNA. While blood contains fewer mitochondria compared to tissues such as muscle and liver, it is a convenient source for mitochondrial DNA isolation. Blood samples are relatively easy to collect and store, making them a practical choice for certain research applications.