Amino Acid Composition of Ingredients : 2010 Crop Survey

The corn samples in the following table are divided into three categories: Midwest-USA, East-SE USA and ALL-USA. While the overall CP average of corn [i.e. ALL-USA] settled out around 7.45% [n=93], the CP of corn in the East-SE [n=43] and Midwest [n=50] was ~8.11% and 6.88%, respectively. This difference could indicate that a different population of corn was grown in each of the regions [i.e. #2 yellow dent corn in the Midwest vs. some other corn in the East-SE – perhaps NutriDense®]. Regardless of the region, corn analyzed lower in CP [on an as-is and DM basis] when compared to the PNRC and SNRC datasets. Looking at only the Midwest data, tLys, tThr, tM+C, tArg, tIle, tVal, tSer and tTrp analyzed lower when compared to the East-SE and both NRC datasets. For the East-SE data, many of the previously mentioned AAs were in agreement with the NRC datasets; however, the tThr, tMet, tM+C, tArg, tGly and tSer were [at most] 19, 35, 21, 14 and 18% higher when compared to the NRC references and Midwest data. Key takeaways: AA values for corn may vary by region.

Two sources of DDGS are compared in the following table, Canadian and Midwest-USA. On an as-is basis, the DM of the two DDGS sources [88.63 and 86.35%, respectively] is much lower than that of the PNRC dataset [93%¹]. Comparing the tLys values, Canada and the USA are 23 and 12% higher in tLys than the PNRC [0.75% tLys]. In addition, the relative ratio of tLys: CP [an indicator of Lys quality / availability] is ~3.33%; a value that far exceeds that of the PNRC [2.76%] and that which is recommended by the HSL [>2.80 – see HHS Swine Focus-001-2007 ^{2, 3}]. Judging from the lower DM of the 2010 samples and that of the PNRC and HSL datasets, it is likely that Lys was not damaged as the DDGS was dried. The Canadian DDGS has a higher concentration of all AAs [except tGly] when compared to the DDGS from the Midwest, and are more in agreement with that of the HSL than the PNRC. Key takeaways: AA quality of DDGS has improved, but also may vary by region.

¹ Dr. Stein’s data was assessed a 93% DM.
² The analytical values that are reported are influenced by the source of corn and both the fermentation and processing conditions of the ethanol plant. The values aresegregated by state, not ethanol plant.
³ DDGS data from Dr. Stein’s lab is referenced in the table above. For those that have access to the Excel worksheet entitled “2010 Crop Survey Report_4-4-2011”, the 1998Swine NRC can be selected from a dropdown menu for an alternate comparison.

The SBM¹ sample analyses in the following table are divided into three categories: Midwest-USA, East-SE-USA and ALL-USA. Samples from the East-SE analyzed higher in CP than either of the Midwest or NRC datasets. The average CP of SBM from the East-SE was 48.34% [n=27], Midwest was 46.97% [n=50] and of all samples was 47.45% [n=77]. The average CP [n=77] was in agreement with that of the two NRC datasets. Following the lower CP, the tLys, tMet, tM+C, tArg, tGly, tSer and tTrp of the Midwest samples analyzed lower than that of the East-SE, PNRC and SNRC datasets. Comparing analysis data for the East-SE samples to that of the PNRC and SNRC datasets; tLys, tM+C and tTrp analyzed low, while tArg and tVal analyzed high. Key takeaways: Enough differences exist in the AA quality of SBM for nutritionists to track and periodically update the AA matrix values for SBM in their formulation software.

1 Dehulled and solvent-extracted. While the values are segregated by region [based on state], the analytical values that are reported are influenced by the source of soybeans that are either trucked or railed to a crushing plant. The values are segregated by state, not crushing plant.