addition of supplemental fat, but feed and energy intake increased linearly (P < 0.01) with increasing dietary fat. Sows fed CWG diets had reduced (linear, P < 0.05)BW loss during lactation. Litter growth rate was not affected by additional dietary fat. Addition of CWG
to the diets improved G:F (sow and litter gain relative to feed intake) compared with the G:F of sows fed the control diet or the diets containing the A-V blend (0.50,0.43, and 0.44, respectively; P < 0.05). Gain:ME (kg/Mcal ME) was greater (P < 0.05) for CWG (0.146) than A-V blend (0.129) but was not different from that of the control diet (0.131). Addition of A-V blend and CWG both improved (P < 0.05) conception and farrowing rates and subsequent litter size compared with the control diet. In conclusion, energy intake increased with the addition of fat. The A-V blend contained a greater amount of aldehydes (quantified by anisidine value) and
was more susceptible to oxidation, resulting in reduced feed efficiency than CWG. Subsequent litter size and reproductive performance was improved by inclusion of both sources of fat in diets fed to lactating sows.