Fig. 1

Fitted broken-line of the ratio of unsaturated to saturated fatty acids (U:S) of oil versus standard ileal digestibility (SID) of fat. Each data point represents least squares means of 6 observations. Each regression model shows the SID of fat (y) relative to U:S (x). The linear broken-line model for the SID of fat indicated that the breakpoint for U:S of oil was 4.14 based on the following equation: y = 97.17 – 3.30 × (4.14 – x) where x is less than 4.14 (R² = 0.89, P < 0.01)