책임운영기관 농촌진흥청 국립축산과학원

This study evaluated the effects of dietary lysine levels in low-nitrogen diets on the growth performance, nitrogen excretion, and metabolic health of growing pigs. Seventy crossbred pigs (Landrace × Yorkshire × Duroc) with an average initial body weight of 32.38 ± 0.25 kg were assigned to four dietary treatments: a control diet (crude protein [CP]: 16%, lysine [Lys]: 1.22%) and three low-nitrogen diets (CP: 15%) with varying lysine levels (1.22, 1.32, and 1.42%). Growth performance and nitrogen excretion were assessed over 42 and 7 days, respectively. The results showed no significant differences in growth performance among treatments (p > 0.05), while urinary nitrogen excretion decreased by up to 35% in the high-lysine group (1.42%) compared to the control. Nutrient digestibility and blood metabolic parameters remained stable across all treatments, indicating that lysine supplementation maintained physiological balance and reduced environmental nitrogen output. These findings suggest that lysine-supplemented low-nitrogen diets can effectively reduce nitrogen excretion without compromising pig growth, providing a sustainable solution for minimizing the environmental impact of pig production.