Hi Patricia,
Thanks for the kind words.
It sounds like you are doing all you can then. Compare kcals/kg on dry matter basis if moisture contents are different between the products. Fiber will affect that as well and the fiber levels in the G.A. only measure a portion of the true fiber amount.
The calculator is the best tool, BUT as they say garbage in garbage out…and the numbers you are using from a G.A. may have so much variation from the actual that unless you can get a typical analysis from the manufacturer the result you end up with may be a far cry from the actual caloric distribution.
