Before being widely used we should be sure the properties of the animal are stable, and the animal is not suffering. One objection to use of cloning or genetic engineering for mass livestock production may be the decrease in genetic variety. We note that over the twentieth century biodiversity of plants and animals used in food production has decreased. It is not hard to imagine artificial elimination of many genetic traits that may appear unappealing to human eyes. Another reason to clone an animal is to create an animal bioreactor, to produce valuable substances through the use of genetic engineering.
Cloning only makes a genetic copy of the cell with the engineered genetic sequence.
One example are sheep that produce milk that contains medically useful proteins. Creation of cloned pigs as organ donors has also been reported. Making organs for human transplantation in animals was the topic most discussed in the group. The concern here is whether it is ethical to make organs in animals, because it means they have to be killed when needed as an organ donor. Pigs are considered by many as the best animals, because their body size, internal gut system, and biochemistry are similar to humans and also from its long history of being raised for meat.