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 test the hypothesis that the standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) in high protein corn fermented products and in the residual distillers dried grains and solubles (DDGS) is greater than in soybean meal (SBM).

Experimental design

Bakery meal, SBM, two sources of high protein corn fermented products (i.e., CFP and Ultra High Pro+), and Post-MSC DDGS were procured. Nine diets were prepared. Two diets contained bakery meal or SBM as the sole source of AA. Six additional diets contained a mixture of bakery meal-CFP (i.e., at 5, 10, 15, or 20%), bakery meal-Ultra High Pro+ (i.e., at 10%), or bakery meal-Post-MSC DDGS (i.e., at 15%). The last diet was a nitrogen-free diet that was used to determine the endogenous loss of AA from the pigs. Each experimental period lasted 7 d. The initial 5 d of each period was considered an adaptation period. Ileal digesta were collected on d 6 and 7 for 9 h using standard procedures. Diets and ileal digesta samples were analyzed for AA and Cr to calculate the apparent ileal digestibility (AID) of CP and AA in corn co-products. The apparent ileal digestibility values were then corrected using the basal endogenous losses of CP and AA to calculate the SID values. Values for SID in the bakery meal diet were used to calculate the contribution of bakery meal to the bakery meal-high protein corn fermented product/Post-MSC DDGS diets, and the SID in each source of high protein corn fermented product and in Post-MSC DDGS were calculated by difference.

Results

The analyzed CP and AA values in CFP and Ultra High Pro+ are greater compared with SBM (Table 1). No difference was observed on the SID of CP and AA (except Trp) in SBM, CFP, and Ultra High Pro+ (Table 2). The SID of Lys, Trp, and Asp was less (P < 0.05) in Post-MSC DDGS compared with SBM, CFP, and Ultra High Pro+. The SID of His, Val, and Ala also tended to be less (P < 0.10) in Post-MSC DDGS compared with SBM, CFP, and Ultra High Pro+. Due to increased concentrations of CP and AA in Ultra High Pro+, concentrations of standardized ileal digestible CP and AA (except Arg, Lys, Trp, and Asp) were greater (P < 0.01) in Ultra High Pro+ than in SBM, CFP, and Post-MSC DDGS (Table 3). The concentration of standardized ileal digestible Arg, Lys, Trp, and Asp was greater (P < 0.01) in SBM than in CFP, Ultra High Pro+, and Post-MSC DDGS. Post-MSC DDGS had the least (P < 0.01) concentration of standardized ileal digestible CP and AA among protein sources.

Key points

• The two sources of high protein corn fermented products (i.e., CFP and Ultra High Pro+) contain more crude protein and AA compared with SBM.
• The SID of CP and most AA in CFP and Ultra High Pro+ was not different than that of SBM.
• CFP and Ultra High Pro+ contained greater quantities of standardized ileal digestible AA (except Arg, Lys, Trp, Asp) than SBM.
• Due to reduced concentration and digestibility of AA, Post-MSC DDGS had less concentration of standardized ileal digestible AA compared with SBM, CFP, and Ultra High Pro+.

Table 1. Crude protein and amino acid composition of soybean meal (SBM), corn fermented product (CFP), Ultra High Pro+, and Post-MSC DDGS, as-fed basis

Table 2. Standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) in soybean meal (SBM), corn fermented protein product (CFP), Ultra High Pro+, and Post-MSC DDGS¹

¹Data are least squares means of 9 observations per treatment.

^a-cMeans within a row lacking a common letter are different (P < 0.05).

^x-zMeans within a row lacking a common letter tend to be different (P < 0.10).

Table 3. Concentrations of standardized ileal digestible crude protein (CP) and amino acids (AA) in soybean meal (SBM), Ultra High Pro, Ultra High Pro+, and Post-MSC DDGS¹

¹Data are least squares means of 9 observations per treatment.

^a-dMeans within a row lacking a common letter are different (P < 0.05).