Study On Effect Of Active Plant Peptides On Product Performance And Mechanism Of Suckling Piglets

In order to study the effect of active plant peptides on product performance and the mechanism, four hundred crossbred PIC suckling piglets (initially 7±2 days of age,with an average weight of 2.61kg) were randomly allotted into four groups with ten pigs per pen and ten replicate pens per group. From 7 to 21 days of age, group I, II, III and IV was fed with diets that were formulated to contain 2% fish meal, 2% spray-dried porcine plasma (SDPP), 2% active plant peptides and 4% active plant peptides respectively. The trial lasted from 7 days of age to 21 days of age. During the trial, the diarrhea rate and death rate was recorded, and the average daily gain (ADG) and average daily feed intake (ADFI) was calculated. At the end of the trial, the blood sample was collected from three piglets with similar body weight in every group to determine the blood indexes such as blood sugar, serum total protein, serum urea nitrogen and antibody level. Subsequently, these piglets were killed and the liver, spleen, pancreas and stomach were separated from the abdominal cavity and weighed. Part of pancreas and adequate chyme was collected from stomach and small intestine to study the activity of digestive enzyme. At the same time, 3 cm intestine canal from the middle piece of duodenum, front 1/4 of jejunum and middle piece of ileum were collected to study the effect of active plant peptides on the villus height and crypt depth in small intestine. Furthermore, adequate content in large intestine was collected to study the gut flora.The result indicated that:①The ADG and ADFI in Group IV were the highest (increased by 21.05% and 15.69% respectively compared to Group II) and the diarrhea rate and death rate significantly decreased in Group IV(P<0.05).②The concentration of blood sugar and serum total protein of piglets in Group III and IV were the highest. The concentration of serum urea nitrogen remarkably decreased in Group IV(P<0.05). The level of IgG in serum in Group II and IV was significantly higher than that in Group I and III (P<0.05). ③The activity of digestive enzyme except the pepsin in pancreas, duodenum and jejunum were significantly higher in Group IV than that in Group I (P<0.05). The activity of lipase in pancreas, duodenum and jejunum was remarkably higher than that in Group II (P<0.05).④The villus height in duodenum and jejunum was the highest in Group IV(P<0.05), however, the Crypt depth in Group IV was not significantly higher than three other groups.⑤The amount of E. coli and salmonella in piglets'large intestine were the lowest in Group III and IV(P<0.05). At the same time, the amount of lactobacillus was the highest in Group IV(P<0.05).