Animal fats are different!!! Butterfat is only 80% fat, pork and beef 
fat are 25% fat, but tallow is 100% fat. The primary difference is 
that most of the animal fats are saturated. We don't know the extent 
of large differences, but there are differences in availability 
between some animal and vegetable fats, and also between vegetable 
fats. There is some speculation that vegetable fats may be better for 
energy utilization because more fatty acids could be available at a 
faster rate. Also, high fat diets generate less heat of metabolism than high 
soluble carbohydrate diets, which may translate into a cooler body 
during work.  The proportion of fatty acids are different, and some 
fatty acids are essential (EFA), and help with membrane integrity and 
the immune response. These are found only  in vegetable fats, and 
cannot be synthesized by animals.  Cheers...Lynn
Lynn E. Taylor, MS, PhD
Assistant Professor
Dept. of Equine Science
Otterbein College
Westerville, Oh 43081
ltaylor@otterbein.edu