Flowers of Sulpher, i have heard is used for helping to condition the feathers whether its to make the quills stronger or to help increase the bloom i don't know.....
the strain don't mean anything....... its the bird that races not the strain. as long as the birds are healthy and happy i would'nt worry about it...just enjoy your flying...
up until 4yrs ago we used to miss the weekend before the channel races..but now we send to the weekend before with hardly any problems,but we do feed quite heavy (ie as much as they want).....