genetic manipulation which means that his future descendants will be mostly male. “data-reactid =” 12 “> Cosmo is a cute little calf weighing 50 kilos with a black coat. He was born in California last April and is doing like a charm. Cosmo n ‘ is however not quite a calf like the others. genetic manipulation which means that his future descendants will be mostly male.

Alison Van Eenennaam, a geneticist in the Department of Animal Sciences at the University of California, Davis. In other words, even a female calf, with two X chromosomes, will develop male attributes. “Data-reactid =” 13 “> To achieve this result, researchers at the University of California used the CRISPR / Cas9 technique to insert in its genome a gene called SRY and responsible for the initiation of male development in the embryo. ” Cosmo’s offspring who inherit this gene will grow up and look like males whether or not they have a Y chromosome. », Attests Alison Van Eenennaam, a geneticist in the Department of Animal Sciences at the University of California, Davis. In other words, even a female calf, with two X chromosomes, will develop male attributes.

The gene has been inserted on chromosome 17, so that 75% of the offspring will turn into male. © Alison Van Eenennaam

More males = more meat

less methane emissions at stake. “It will suffice to keep a few females for reproduction and to drive the other male cattle to the market. “. In short, a boon for the breeding world. “Data-reactid =” 26 “> The interest is obviously economic.” Male cattle produce 15% more meat for the same amount of feed », Explains Alison Van Eenennaam. Plus, they tend to be bigger and heavier, resulting in more meat. ” Raising more males is also an environmental benefit, as less livestock are needed to produce the same amount of meat. Adds Joey Owen, a postdoctoral researcher in animal sciences who is leading the project with Alison Van Eenennaam. So less methane emissions at stake. ” It will suffice to keep a few females for reproduction and to drive the other male cattle to the market. “. In short, a boon for the world of breeding.

75% of male descent

Ideally, the researchers hoped to be able to insert the SRY gene on the X chromosome. That way, 100% of the offspring would have developed male attributes. Unfortunately, he …

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