Zinc methionine and laminarin have growth-enhancing properties in newly weaned pigs influencing both intestinal health and diarrhoea occurrence.

Abstract

Three experiments were conducted to investigate the interaction between zinc methionine (ZnM) and laminarin (LAM) on piglet growth performance and intestinal health post-weaning. Experiment 1 was designed as 2×2 factorial with four treatments [n=8, weaning age (WA) 24days, live weight (LW) 7.15kg]: (i) basal diet (BD); (ii) BD+500mg/kg ZnM; (iii) BD+300mg/kg LAM; and (iv) BD+500mg/kg ZnM+300mg/kg LAM. There was an interaction (p<0.05) between LAM and ZnM. Pigs that were offered the LAM diet had a similar performance to the BD. However, when combining LAM with ZnM, pigs had reduced average daily gain (ADG), gain-to-feed ratio (G:F) and LW at slaughter at day 8 post-weaning compared to the ZnM. Both LAM and ZnM improved the small intestinal morphology of the pigs at day 8 post-weaning. Experiment 2 was designed as 2×2 factorial with four dietary treatments (n=9, WA 24days, LW 7.32kg): (i) BD; (ii) BD+500mg/kg ZnM; (iii) BD+175mg/kg LAM; and (iv) BD+500mg/kg ZnM+175mg/kg LAM. The ADG and average daily feed intake were improved between day 0 and 31 PW when pigs were offered a LAM diet (p<0.01). Faecal scores were reduced between day 0 and day 31 post-weaning with ZnM (p<0.001). Experiment 3 consisted of four dietary treatments (n=10, WA 24days, LW 7.32kg): (i) BD; (ii) BD+3300mg/kg zinc oxide (ZnO); (iii) BD+500mg/kg ZnM; and (iv) BD+175mg/kg LAM. Pigs that were offered the ZnO diet had an increased ADG compared to the BD or ZnM diets (p<0.01). Pigs that were offered the LAM diet had increased ADG compared to the ZnM diet (p<0.05). Faecal scores were reduced between day 0 and day 31 PW with ZnM or ZnO supplementation (p<0.001). In conclusion, the inclusion of 175mg/kg LAM and ZnO improved ADG while both ZnO and ZnM reduced the faecal scores post-weaning.