Digestibility of energy and concentrations of digestible and metabolizable energy in high protein corn fermented products fed to growing pigs

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New sources of high protein corn co-products have been recently developed and may be included in diets fed to pigs. High protein corn fermented products have been evaluated in several economically important livestock species, but additional information is required with respect to the use of these products in pigs. Therefore, an experiment was conducted to evaluate the digestible energy (DE) and metabolizable energy (ME) of high protein corn fermented products and in Post MSC DDGS.

Experimental design

Two sources of high protein corn fermented products (i.e., CFP and Ultra High Pro+), and Post-MSC DDGS were procured. Four diets were prepared. Dietary treatments included a corn-based diet and three diets based on a mixture of corn and each source of high protein corn fermented product/Post MSC DDGS. Thirty two pigs (20.51 ± 1.74 kg) were used and allotted to four diets with eight replicate pigs per diet. Pigs were housed individually in metabolism crates. The initial 5 days were considered the adaptation period to diets, and fecal and urine samples were collected for 4 days following the adaptation period. Diets, ingredients, fecal, and urine samples were analyzed for gross energy to calculate for apparent total tract digestibility (ATTD) of gross energy (GE) and DE and ME in each diet. The DE and ME in high protein corn fermented products/Post MSC DDGS were calculated by difference.

Results

The analyzed concentration of total dietary fiber was greater in corn co-products compared with corn; however, increased concentration of gross energy was observed in corn co-products compared with corn (Table 1). The ATTD of GE in Post MSC DDGS was less (P < 0.01) compared with that of corn, CFP, or Ultra High Pro+ (Table 2). As a result, concentrations of DE and ME (as-fed basis and dry matter basis) in Post MSC DDGS were less (P < 0.01) compared with corn, CFP, or Ultra High Pro+. The two high protein corn fermented products had reduced (P < 0.01) ATTD of GE compared with corn; however, due to increased concentration of GE in CFP and Ultra High Pro+, greater (P < 0.01) values for DE and ME (as-fed basis) were observed for CFP and Ultra High Pro+ compared with corn. Likewise, the DE on a dry matter basis was also greater in CFP and Ultra High Pro+ than in corn.

Key points

  • Concentrations of DE and ME in Post MSC DDGS were less compared with corn and the two high protein corn fermented products.
  • Corn had greater ATTD of GE compared with CFP and Ultra High Pro+; however, DE and ME (as fed basis) were greater in CFP and Ultra High Pro+ than in corn.
  • The ATTD of GE and concentrations of DE and ME were not different between the two high protein corn fermented products.

Table 1. Energy, fat, and fiber composition of corn, corn fermented product (CFP), Ultra High Pro+, and Post-MSC DDGS, as-fed basis

Table 2. Concentration of digestible energy (DE) and metabolizable energy (ME) and apparent total tract digestibility (ATTD) of gross energy in experimental diets and in corn, CFP, Ultra High Pro+, and Post MSC DDGS1

1Data are means of 8 observations per treatment.

a-cValues within a row lacking a common superscript letter are different (P < 0.05).