Trainer, it’s a great question. No way to answer with any degree of precision. Some back-of-the envelope computations for 3 metric tons per month.
I’d guess 15 to 20 workers for sericulture aspects (raising and feeding silkworms and harvesting cocoons). Assuming most processing is done off-site, another 5 to 10 workers to handle cocoons. That puts us around 25 to 30 workers.
If reeling is being done on-site, a wild-ass guess is another 20 workers. All of these numbers are based on sufficient technology to automate aspects like shredding mulberry and killing silkworms.
The real question is about testing. Does each silkworm have to be tested individually, or can a batch be tested by, for example, looking for genes in silkworm poop from a tray of silkworms? How long does it take to test a silkworm or a batch? Depending on the answers to these questions, you could get a number between 20 and 500.
Processing 3 metric tons per month would require at least 50 workers in this estimation. It’s not precise, but I suspect it is not off by a factor of 2. Without knowing more about testing protocols, the number needed for testing could be much larger.