This definitely interested me as with my kitten on the mend I like the idea of getting some additional calcium in his raw diet. So I contacted WildTrax and below is their response to the batch addition question,
First you need to calculate how much meat your cat (or cats) will be fed per meal and then determine how many meals/servings are in your total meat batch.
If you are feeding raw meat you can use the following figures as a guide as to how much meat your cat should be eating per day and then divide that amount out into however many meals you want to feed in a day. Normally, a growing kitten needs about 5% of their body weight in food (raw meat) per day. An adult without any special needs ( such as being pregnant or ill) needs about 3% of their body weight in food (raw meat) to maintain their current weight. (If the cat does not seem to get satisfied with that amount, experiment to find the right amount that satisfies the cats hunger without overeating or gaining too much weight.)
EXAMPLE: A 10 lb adult cat would need 3% of his body weight in raw meat per day 10lbs x .03 = 0.3 or a third of a pound per day. You can give that in one meal or several over the day, whatever you prefer, but 0.3 is how much meat this cat needs to maintain current body weight and health.
Then you need to determine how many servings are in your total meat batch that you make up at one time. Weigh your final mixed batch.
EXAMPLE: you have a total of 20 lbs of final meat mixture for the 10 lb cat above. 20 divided by .3 size serving = 66 servings.
Now add the dosage of Wildtrax to your batch for 66 servings.
EXAMPLE: The dosage for one meal for a 10 lbs cat would be 1 teaspoon. So you want to put 66 teaspoons into the 20 lb batch. Or convert teaspoons to a larger cooking measurement, such as by the cup to make it easier to measure. There are free measurement conversion tools on the internet to do that.