Liquid Metabolite of Lactobacillus plantarum and Putrescine Effects on Growth, Tissue Polyamine, Blood Lipids and Intestine Morphology of Broiler Chickens

This experiment aimed to investigate the effects of liquid metabolite (LM) produced by Lactobacillus plantarum and dietary putrescine (PUT) on growth, blood lipids, villus height (VH), crypt depth (CD) and polyamines (PAs) content of intestinal tissue and ileal digesta in chickens. Six treatments, replicated six time each, were factorial arrangements of two levels of LM (0 and 0.3%) and three levels of dietary putrescine (0, 0.03 and 0.05%). Growth performance and PAs content of digesta and excreta (at 21 d) were measured, as well as small intestine VH and CD. Blood cholesterol, triglyceride and glucose were measured at 24, 33 and 40th d. Putrescine (0.05%) negatively affected body weight, feed conversion ratio and protein and energy efficiency ratio while increased duodenal VH significantly (P