The addition of fat to diets increased serum
triglycerides and NEFA (P < .OOll, which agrees
with the work of O’Doherty et al. (1972). Pigs fed
Nitrogen digestibility was improved (P
ET AL.
tallow plus emulsifiers had lower serum triglycerides
than pigs fed tallow without emulsifiers (P <
.09). However, there was a quadratic effect of
emulsifier concentration on serum triglycerides (P
< ,031, with increased and then decreased serum
triglycerides as emulsifier concentration was increased
from 5 to 10% vs 10 to 30% of the fat.
Serum NEFA were higher for pigs given tallow
treatments than for those fed soybean oil (P < .091.
Pigs fed diets with added fat had greater total (P
.001), HDL (P < .0011, and LDL (P < .011
cholesterol, but improved HDL:LDL ratio (P <
.005). There was a linear reduction in serum
cholesterol as the concentration of emulsifier was
increased (P < .05), but HDL:LDL ratio was not
affected. Saunders and Sillery (1 976) reported
decreased reabsorption of bile salts in the ileum of
rats fed lecithin, which would contribute to lower