You could inject the hen with a CRISPR vector introducing a mutation into the Z chromosome which would be letal to eggs. Then put a saving gene on the W chrom

You could inject the hen with a CRISPR vector introducing a mutation into the Z chromosome which would be letal to eggs. Then put a saving gene on the W chromosome. Or a letal mutation on the W chromosome, to select for male broilers. And no, it's not centrifugation. The DNA in the chromosomes is stained, then a cell sorter with a laser determines which ones have more or less chromatin (the Y is missing an arm vs X).