It takes time and space to grow the population of any strain of silkworms from laboratory curiosity to production numbers.
We can safely assume that the initial testing samples were from the ~first 10 worms.
Even if they began immediately to ramp up populations and even though pop growth is exponential each egg-to-egg generation takes ~2 months.
If we take the growth factor as 50 (leaving room for saving eggs for protection and for some sacrificed for further samples) 10 in June become 500 in August, 25,000 in October.
At this point lab space becomes a problem competing with MS worms, so plan on another 25,000 in December + 25,000 stored eggs.
By then we should be able to move most of BR to a farm with more space available, so 50,000 becomes 2.5 million in February, the seed for the first production run of BR, which should be ready for harvest in April 2014.
This assumes multivoltine worms, limitless food at all seasons, Zero chill time, etc.
The actual timeline might well be even longer.
There is much more complexity and inertia in sericulture than most here realize.
Mike L.