Variation in chemical composition of corn dried distillers grains with solubles in relation to in situ protein degradation profiles in the rumen

Abstract

Chemical composition and in situ degradation profiles were analyzed for 27 samples of dried distillers grains with solubles (DDGS) distributed in Japan, and a wide variation was found in neutral detergent fiber (NDF) content, which had positive relationships to detergent-insoluble crude proteins such as neutral detergent-insoluble crude protein (NDICP) and acid detergent-insoluble CP (ADICP). Samples with lower NDF (< 35% on dry matter (DM)) showed higher soluble fractions of protein, but the degradation rate of microbially degradable protein in the rumen was not different in comparison with the samples with higher NDF, and no difference was shown between samples with higher and lower NDF after 24 and 48 h of in situ incubation for DM and CP degradation, respectively. The NDICP content in the digestion residue decreased with time of incubation, especially for samples with higher NDF, while the ADICP content increased. These results suggest that a part of the soluble fraction of CP in DDGS would be incorporated into NDICP by the heating process in bio-ethanol production, which is still highly degradable, whereas another part of the fraction incorporated into ADICP would proceed to the advanced steps of irreversible amino-carbonyl reaction.

Univariate and multi‐variate comparisons of protein and carbohydrate molecular structural conformations and their associations with nutritive factors in typical by‐products

“…This discrepancy might be due to the fact that the nutrient values in WB heavily depends on numerous factors, such as grain variety and species, kernel maturity, processing system and condition and grain storage, as stated by Bartnik and Jakubczyk and Friedt . Liu summarised the nutrient contents in DDGS from several studies and reported that the CP contents averaged from 27.4 to 31.4% with the coefficient of variation (CV) of 4.0–6.4%, which was also in a good agreement with the data obtained from more than 25 DDGS samples distributed in Japan (27.9–32.5%) and China (23.3–30.6%) . As stated in previous research, the nutrient property would change due to the process variables such as the ratio of blending wet distiller's grains and condensed distiller's solubles during the drying process.…”

Effect of feeding dried distillers' grains with solubles on milk yield and milk composition of cows in mid‐lactation and digestibility in sheep

“…() and Kajikawa et al. () found partial degradation of ADiN in the rumen, suggesting that ADiN is not a reliable measure for protein indigestibility of DDGS and other plant protein by‐product sources. Kajikawa et al.…”

“…Kajikawa et al. () proposed a partial degradation of NDiN, due to low levels of lysine and xylose in DDGS, which are involved in the Maillard reaction.…”

In situ ruminal degradation of amino acids and in vitro protein digestibility of undegraded CP of dried distillers’ grains with solubles from European ethanol plants

“…This suggests that ADiN is not a good indicator for unavailable CP in DDGS-r. This may be explained owing to the relative high degradation of ADiN in the rumen (Nakamura et al 1994;Kajikawa et al, 2012) so that the amount of ADiN that reaches the duodenum is relatively low and does not have any relevance or negative effect in the intestinal digestion of ruminants. On the other hand, there was a moderate relationship between ADiN and PPS of DDGS-s (r = 0.79, P = 0.002).…”