What I know is the air flow condition is a big restriction of live animal carriage.
Sorry I don't have figure of B742F but as far as I know the limit of live pig/horse caarige on B744F is about 70tons, net weight.
Say each pig weighing around 50kgs, so each aircraft can carry about 1400 heads.
I handled three pig charters in 2008, each charter carried over 1000 heads live pig.
Refer to the taxiing fuel, it's subject to how long the taxing from parking bay to departure runway will be.
Generally, many carriers regulate the average taxing fuel for load sheet generation purpose, sometimes will be 1000Kgs, but other carriers set as 1800kgs or less, which is always different from actual fuel combustion.