ISSUE FOCUS 52 FEED & ADDITIVE MAGAZINE November 2025 need for a ZnO supplement entirely. The results, as shown in Table 2, were comparatively similar for both treatments. While there was a slightly higher mortality rate in the Presan-FX group, the added value per piglet was €0.40 higher than the high-ZnO group at the end of the 33-day trial. These findings suggest that Presan-FX presents a reliable and economically viable solution for ZnO-free feeding strategies, while also supporting a more sustainable approach to pig production. SUPPORTING PERFORMANCE IN AGP-FREE DIETS With growing concern over antibiotic resistance, the push to eliminate AGPs from animal feed has intensified. While such efforts support public health, Day 0-12 Day 0-33 Table 2. Zootechnical performance for day 0-12 and day 0-33 of weaned piglets fed high ZnO or Presan®-FX starter diet (day 0-12) Average daily feed intake, g/d Average daily gain, g/d Feed conversion Ratio, kg/kg Body weight, kg Mortality, % ZnO 3,000 ppm 290.9 226.2 1.32 10.9 – Presan®-FX 2 kg/t 277.3 224.2 1.30 10.9 – ZnO 3,000 ppm 593.6 435.9 1.36 22.7 2.64 Presan®-FX 2 kg/t 586.9 438.9 1.34 22.8 2.99 Phase 1 1,49 1,33 1,55 b b a a b a 1,46 1,53 1,43 1,60 1,50 1,40 1,30 1,20 FCR, kg/kg Phase 2 Overall period Control Presan 2 kg/t Figure 8. Feed conversion ratio of weaned piglets that received Presan®-FX in place of zinc oxide. Columns with different superscripts indicate significant differences (p < 0.05). Photo: Freepik
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