I understand that. But maybe at 205 days you won't detect a change which would more easily detectable later. Maybe we don't know exactly what to look for, but if something breaks over the long term that would give a clue.

They also only looked at the health of one generation, along with the number of offsprings from that first generation. What happens after 10 generations? 100? Could there be cumulative epigenetic effects from deleting this gene?