Following the Val study, a 56d trial was conducted to determine the SID Ile:Lys requirement of the finishing pig fed diets containing 20% DDGS. A total of 2,268 pigs with an initial BW of 181 pounds were fed one of six dietary treatments, which consisted of diets containing 20% DDGS with SID Ile:Lys ratios of 55, 60, 65, 70 or 75% or a corn-SBM diet. The inclusion of crystalline L-Ile was used to achieve the titrated levels of Ile:Lys. Diets were formulated to contain 95% of the Lys requirement and similar net energy levels. Levels of Val and Trp were provided at 78 and 21% relative to Lys in DDGS diets. Performance was not affected due to increasing the SID Ile:Lys ratio in diets containing 20% DDGS during the finishing period. However, providing a SID Ile:Lys ratio of 70% resulted in the greatest numerical ADG when pigs were fed DDGS diets and similar ADG compared to pigs fed the corn-SBM diet. The prediction model by Cemin and coworkers (2019) reasonably estimated the performance results in this study apart from the 65% Ile:Lys treatment. However, this may be attributed to unexpected performance of pigs fed the 65% Ile:Lys treatment rather than inaccuracies of the model. In this study, pigs fed the corn-SBM diet still yielded the numerically greatest ADG compared to DDGS diets (Table 1).
To achieve maximum growth performance, a SID Val:Lys ratio of 68% should be utilized when including 30% DDGS in diets during the grower period. However, the inclusion of Val in diets containing 30% DDGS did not result in similar growth performance compared to pigs fed corn-SBM diets. During the finishing period, a SID Ile:Lys ratio of 70% appeared to achieve maximum growth performance of pigs when feeding 20% DDGS. These results are in agreement with Kerkaert and coworkers (2021). Furthermore, supplying a 70% SID Ile:Lys ratio in DDGS diets provided similar pig production performance compared to a corn-SBM diet.
|Final BW, lbs.||285.0bc||285.0abc||282.8c||286.1ab||282.4c||287.7a||1.39||0.002|
a-d Means within a row lacking common superscript differ significantly, P<0.05
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