Experimental Procedures
The study evaluated three levels of degummed soybean oil (0, 5, and 10%) and three lactose levels (0, 15, and 30%) in a 3 x 3 factorial arrangement of treatments in a randomized complete block design. The study was conducted in nine replicates at the Ohio State University swine center.
Corn-soybean based diets were formulated to a constant lysine (%): ME (Mcal/kg) ratio during the initial 14 days postweaning (phase 1), and for the following 21 day period (phase 2). Diet compositions are presented in Table 1.
A total of 342 crossbred pigs weaned at 17±2 days of age weighed an average of 6.2 kg body weight. Pig weight gain, feed intake, and gain to feed ratio were determined at weekly intervals. Blood samples were collected from 5 pigs/pen at both the 2 and 5-wk postweaning period with the plasma analyzed for triglyceride and urea nitrogen.
At the end of the 35-day trial three pigs per treatment group were electrically stunned, and killed by exansguination. Backfat was determined at the carcass midline and the last rib using a metal calibrated ruler. The intestinal contents were removed, the carcass frozen (-20 0 C) and later ground for determination of body composition.