Effects Of Spray-dried Chicken Plasma On Digestibility Of Diet Amino Acids, Protein Metabolism And Enter-immune Function In Weaned Piglets

The experiment was conducted to investigate the effect of SDCP which was the neotype protein feedstock and immunoenhancer,on digestibility of diet amino acids, protein metabolism and enter-immune function of weaned piglets.32 28-day-old DLY weaned piglets were randomly allotted into 2 treatments with 4 replicates each(2 females and 2 males for each replicate).Pigs in treatmentⅠwere fed basal diet(control group) and those in treatmentⅡwere fed the diet which contained 7.5%SDCP instead of some parts of protein,by equal energy,nitrogen and ratio.The whole trial cost 28 days in all. Piglets were fed two diets according the treatments respectively during d 1 to d 14.The digestion trial was conducted during d 7 to 14 and the manure was collected at the last three days of this period.Afterwards two treatments were replaced by the same basal diet until d 28.The feed management followed the routine procedure.4 piglets for each treatment were butchered at the end of experiment,in order to determine index of enter-immune function and protein metabolism.The results indicated that:(1) SDCP improved apparent digestibility of nutrients in weaned piglets,so that digestibility of dry matter,crude protein were better than the control group (9.08%,1.08%),and SDCP significantly improve apparent digestibility of crude fat (22.59%,P＜0.05).Digestibility of lysine and methionine were also significant better than the control(4.69%and 4.78%,P＜0.01).SDCP significantly improve apparent digestibility of threonine,valine,tryptophane(4.15%,5.44%,4.27%,P＜0.05). Digestibility of essential amino acid,non-essential amino acid and con-amino acids were still significant better than the control group(3.52%,3.04%and 3.32%,P＜0.01).(2) SDCP improved the metabolism of proteinaceous degradation,increased synthesis efficiency.Serum BUN and GPT had significantly decreased when feed diet with SDCP on anaphase(44.19%and 21.09%,P＜0.01).Total protein of serum had respectively increased when feed diet with SDCP on prophase and anaphase(10.61%and 4.29%). SDCP still increased the serum albumin to the control group on prophase and anaphase (10.67%,4.08%).Protein synthetic capacity of liver was higher than the control group(20.17%),but SDCP decreased the Protein synthetic capacity of thymus(24.38%).(3) SDCP improved entero-immunologic function of weaned piglets.SDCP improved liver and renal index of the weaned piglets compared with control group(respectively to 14.58%,7.04%).IL-1βof jejunum(P＜0.05)and Ileal mucous membrane or lymphonodi mesenterici was respectively decreased(35.22%,18.37%,13.79%),IL-6 of jejunum and Ileal mucous membrane or lymphonodi mesenterici were also decreased(respectively 19.4%,28.4%,40.75%),sIgA of jejunum and Ileal mucous membrane was improved (35.1%and 28.46%).In summary,the diet supplementation with SDCP could improve the growth potentiality of piglets via increasing apparent digestibility of nutrients,accommodating body protein metabolism and enhancing entero-immune function of weaned piglets.