Partial Substitution of Whey Protein Concentrate with Spray-Dried Porcine Plasma or Soy Protein Isolate in Milk Replacer Differentially Modulates Ileal Morphology, Nutrient Digestion, Immunity and Intestinal Microbiota of Neonatal Piglets.

Appropriate protein sources are vital for the growth, development and health of neonates. Twenty-four 2-day-old piglets were randomly divided into three groups and fed isoenergetic and isonitrogenous diets. The experimental diets included a milk replacer with 17.70% whey protein concentrate (WPC group), a milk replacer with 6% spray-dried porcine plasma isonitrogenously substituting WPC (SDPP group), and a milk replacer with 5.13% soy protein isolate isonitrogenously substituting WPC (SPI group). Neonatal piglets were fed milk replacer from postnatal day 2 (PND 2) to day 20 (PND 20). The growth performance, intestinal morphology, activities of digestive enzymes, plasma biochemical parameters, immunity-related genes, short-chain fatty acids (SCFA) and intestinal microbiota in the colonic chyme were determined. The results showed that SDPP-fed piglets had higher final BW ( = 0.05), ADG ( = 0.05) and F/G ( = 0.07) compared with WPC- and SPI-fed piglets, and SDPP-fed piglets had a lower diarrhea index ( < 0.01) from PND 2 to PND 8. SDPP-fed piglets had an increased ileal villus height ( = 0.04) and ratio of villus height to crypt depth (VCR) ( = 0.02), and increased activities of sucrase ( < 0.01), lactase ( = 0.02) and trypsin ( = 0.08) in the jejunum, compared with WPC- and SPI-fed piglets. Furthermore, SPI-fed piglets had an increased mRNA expression of ( < 0.01) and concentration of plasma urea ( = 0.08). The results from LEfSe analysis showed that SDPP-fed piglets had a higher abundance of beneficial compared with WPC- and SPI-fed piglets, in which higher abundances of pathogenic bacteria such as , and were observed. Moreover, SDPP-fed piglets had an increased concentration of butyric acid ( = 0.08) in the colonic chyme compared with WPC- and SPI-fed piglets. These results suggest that neonatal piglets fed milk replacer with SDPP partially substituting WPC had improved growth performance and intestinal morphology and function, associated with higher digestive enzyme activity and fewer pathogenic bacteria.