Abstract
The objective of this experiment was to determine the standardized ileal digestibility (SID) of amino acids (AA) in 3 sources of distillers dried grains with solubles (DDGS) with different concentrations of fat. Twelve growing barrows (initial body weight: 76.1 6.2 kg) were randomly allotted to a replicated 6 × 4 Youden square design with 6 diets and 4 periods. The fat content of the 3 sources of DDGS were 11.5, 7.5, and 6.9% respectively. Diets contained 60% DDGS and fat concentration of the diets were 7.5, 5.2, and 5.2%, respectively. Two additional diets containing the 2 sources of DDGS with 7.5 and 6.9% fat were also formulated, and corn oil was added to these diets to increase the concentration of fat in the diets to levels that were calculated to be similar to the diet containing conventional DDGS with 11.5% fat. A N-free diet was also formulated to calculate endogenous losses of crude protein (CP) and AA from the pigs. Pigs were fed experimental diets during four 7-d periods. The first 5 d of each period were an adaptation period and ileal digesta were collected on d 6 and 7 of each period. The apparent ileal digestibililty (AID) and SID of CP and all indispensable AA, except AID Pro and SID of Trp, were greater (P < 0.01) in conventional DDGS than in the 2 sources of DDGS with reduced fat. Adding oil to the diets containing the 2 sources of DDGS with reduced fat did not consistently increase SID of AA. In conclusion, conventional DDGS has greater SID values for most AA compared with DDGS that contains less fat and inclusion of additional oil to diets containing low-fat DDGS does not increase AID or SID of AA. The lower AA digestibility in low-fat DDGS could not be overcome by the inclusion of additional fat to the diets.
Highlights
Distillers co-products have been used in swine diets for more than 50 years, but the increase in ethanol production in the last few decades has made distillers dried grains an available and attractive ingredient to use in swine diets [1]
The objective of this research was to determine if the concentration of fat in dried grains with solubles (DDGS) and diets containing DDGS affects the apparent ileal digestibility (AID) or standardized ileal digestibility (SID) of crude protein (CP) and amino acids (AA) fed to growing pigs
The SID of CP and all indispensable AA except Trp was greater in conventional DDGS (P < 0.01) than in the 2 sources of low-fat DDGS (Table 5)
Summary
Distillers co-products have been used in swine diets for more than 50 years, but the increase in ethanol production in the last few decades has made distillers dried grains an available and attractive ingredient to use in swine diets [1]. Conventional distillers dried grains with solubles (DDGS) contains approximately 27% CP, 10% fat, 9% acid detergent fibre (ADF), and 25% neutral detergent fibre (NDF) [1,2,3]. New technologies have been developed and implemented to remove fat from DDGS to be able to market the oil for biodiesel production or other uses. If oil is removed by centrifugation of the solubles before solubles are added to the distilled grains, a low-fat DDGS is produced. Low-fat DDGS contains 6 to 9% oil [3]. If oil is extracted from DDGS using a solvent extraction process, de-oiled
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