1.  How many Liters of blood are in a chicken, cow, pig?
2.  How many kg blood meal are produced per cow, chicken, & pig? 
(please note in answer if exclusively for "blood meal" (preferred) or
"blood and meat meal")

Partly because of the wide range of animal sizes among each of the
species listed, we used to learn ratio ranges for calculating blood
volume. For cows, pigs, and chickens, the ratio is about 60 (a bit
less for cows, a bit more for pigs) for mass in kilos to volume in ml.
I used to have a slide rule device that rolled up ratios and
calculated collection volumes needed for a variety of tests. Not a
slide rule exactly-- think more the circular computation device Peter
Sellers used at the end of Dr Strangelove but without the uncontrolled
right arm.

I leave it to a researcher to answer this part of the question more
precisely along with the second part, the entirety of which is
underpriced in my opinion.