The enc's we raise are slightly different color from the ones we buy. The ones we buy have a whitish tail, the ones we raise have a yellowish tail and don't seam to get as solid or as big.
Also, the ones we raise breed more frequently than the ones we buy.

I am assuming this has to do with bedding and food.
We use peat and peat moss for bedding. And we feed crushed corn, crushed wheat and crushed soybean.

Any help would be appreciated.

Thanks

QUOTE:
I am assuming this has to do with bedding and food.

Try an experiment, and change only one variable, e.g. bedding.

Grab a few garbage bags of shredded paper from a local office and use the shredded paper for bedding.

Photograph the pound(?) of worms on entry to the composter, and at monthly intervals to see if the color changes. Since you have changed the bedding, maintain the same food.

In a separate experiment, try changing the food, but maintain the bedding (peat moss).

You might also consider further experiments where you add various known Good things. The scale of your operation my prohibit long-term implementation, but, as yet another e.g., my local coffee shop generates 5+ gallons of coffee grounds per day; you could run an experiment where you add a pound of coffee grounds per day and see what effect that has.

I think that experiments to determine yield of worms and consumption of feedstuffs are very difficult to measure, but color (and size) or worms is reasonably straightforward.

When you figure it out let us know. I'm not sure what the best bedding would be. I have mine in shredded newspaper and cardboard, fed with mainly rabbit feed with crushed egg shells. I notice the yellow tail on some of the younger worms but on the older and bigger ones I don't see it.