Normally in laboratory research and farming, offspring of the unrequired sex are killed after birth.
because they do not lay eggs and do not make good meat. In the U.S., this amounts to around 300 million male chicks annually. In the dairy industry, hundreds of thousands of male calves are killed, often in the first week of their lives.Charlotte Douglas from the U.K.'s Francis Crick Institute looked at gene editing to solve this problem. With colleagues, Douglas set about developing a genetic system that inactivates embryos just after fertilization so that only one sex develops..
The team believes that because the genes targeted are found across mammalian species, it could be used in other animals to improve welfare."Animals are essential genetic tools in scientific research and global resources in agriculture," they wrote in the study."In both arenas, a single sex is often required in surplus. The ethical and financial burden of producing and culling animals of the undesired sex is considerable...
Peter Ellis, another author on the study, said that ethical and regulatory issues need to be addressed before it is introduced to the agriculture industry."Further research is needed, first to develop the particular gene editing toolkits for different species, and then to check they are safe and effective," he said.
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