麻豆约拍

Scientists in the United States have used gene editing technology to breed cattle without horns. They've taken genes from hornless Aberdeen Angus cattle, and added them to dairy cattle. Usually dairy calves have to be de-horned. The technique is controversial though. The animal welfare charity Compassion in World Farming says it's unnecessary, and the same effect could be achieved through natural cross breeding.

Presented by Anna Hill and produced by Sally Challoner.