Well then you may not see enough of an improvement to justify the added cost.
Just a few questions/points to ponder:
Typical litter size = 12? Maybe less for tub bred)
Typical litter frequency = 26 days (for tub bred with males and females kept together)
Most important (IMO), How healthy are your rats? Nice and plump. Remember, you're raising them as food for your prized snakes.
One last thought, how long does 50 lb of dog food last for how many rats? A while back, before I increased production, I had around 200 each mice and rats. Back then I went through about 5 1/2 pounds of rodent blocks a day.
yearly usage = 40 bags
40*50/365 = 5.48
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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
13.24 BRB
12.14 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 