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The search for useful resources locally produced for livestock is an attempt of urgency, particularly in the wake of high grain price and high demands of reducing global warming potential. Despite its negative impact on performances, increasing attention has been paid to dietary fiber in monogastric animals’ nutrition due to its multiple functionalities, especially in sow diets. In the experiment, a total of 48 Yorkshire cross with Landrace (YL) hybrid sows were fed with dry matter base of 0, 15, 30 and 50% extruded whole-plant forage corn silage (52.5% DM and 8.4% CP) replacement experimental diets during gestation and lactation. Sows were weighed, the backfat thickness was measured ultrasonically and jugular blood samples were collected from all sows. The results show that sows fed with corn silage replacer loss more body weight (P=0.015) and backfat thickness (p=0.024) during lactation. The 50% replacement sows took an average of 230.52 kg experimental rations during lactation (p<0.001). As can be seen, 50% replacement sows had a higher average daily feed intake of 8.23 kg during lactation. Although not significant statistically, it seemed that control, 15% and 30% replacement sows had better litter weight gain than 50% replacement sows. Sows fed with corn silage replacer tend to have lower total USFA before farrowing (P=0.044) but lower total SFA at weaning (P=0.004) whereas the control sows had the opposite condition. Serums C20:1, C22:1, C24:1 and C20:4 were not detected in late pregnancy for sows fed with corn silage replacer. However, they tend to have increasing concentrations of C22:5 and C22:6 as the replacement rate increases in late pregnancy and convert more body reserve to higher milk lipid contents. In conclusion, 30% sows’ dry matter replacement ration had the highest margins with extruded corn silage. This local resource is an effective approach to reduce feed cost significantly as well as to minimize carbon-foot prints of rations for pig production and increase voluntary feed intake in lactation sows.

The effects of dietary replacement with extruded whole plant forage corn silage on gestation and lactation performances of sow and litter