Digestibility of Amino Acids, Energy, Fat, and Fiber and Digestible and Metabolizable Energy in Low-Oil Distillers Dried Grains with Solubles Fed to Growing Pigs

Two experiments were conducted to test the hypothesis that digestibility of AA, GE, acid hydrolyzed ether extract (AEE), and NDF and DE and ME in low-oil distillers dried grains with solubles (DDGS) vary among suppliers. Eight sources of low-oil DDGS were procured from suppliers in the U.S. and were labelled source A, B, C, D, E, G, H, and I. In Exp. 1, twenty-four barrows (initial BW = 63.4 ± 3.4 kg) with a T-cannula in the distal ileum were allotted to a 2-period Youden square design with 8 diets. An N-free diet and 7 diets containing all DDGS sources except source I were formulated. Ileal digesta were collected for 2 d after 5 d of adaptation. Standardized ileal digestibility (SID) of AA did not differ between DDGS sources A and B, but the SID of most indispensable AA were greater (P < 0.05) in DDGS source B than in DDGS sources C, D, E, G, and H. In Exp. 2, seventy-two barrows (18.1 ± 1.3 kg) were used. A corn-based basal diet and 8 DDGS-containing diets were formulated. Feces and urine samples were collected for 5 d after 7 d of adaptation. The ATTD of GE and the DE did not differ among the 8 sources of DDGS, and no difference in the ME among sources were observed except that DDGS source E contained less (P < 0.05) ME than DDGS source D (Table 1). The ATTD of NDF in DDGS source D was greater (P < 0.05) than in sources E, G, and H and ATTD of AEE in source E was greater (P < 0.05) than in source A. In conclusion, variability in SID of AA, ATTD of NDF and AEE, and in ME were observed among the sources of DDGS used in this experiment.

Table 1. Nutrient digestibility and energy concentrations in DDGS

DDGS

Item, %

A

B

C

D

E

G

H

I

SEM

P-value

SID of Lys

69.7abc

73.5a

65.4cd

61.4d

70.9ab

66.4bc

66.4bc

-

1.7

< 0.001

ATTD

GE

68.4

70.3

73.0

74.3

67.9

71.6

69.7

70.1

1.8

0.102

NDF

65.0ab

62.0ab

65.6ab

68.0a

57.0b

55.3b

55.6b

59.9ab

3.1

0.010

AEE

58.6b

69.0ab

64.6ab

68.7ab

74.8a

67.9ab

69.1ab

65.9ab

2.3

0.001

ME, kcal/kg

2,894ab

2,963ab

3,038ab

3,142a

2,769b

2,988ab

2,976ab

2,857ab

76

0.027

^a-dWithin a row, means without a common superscript differ (P < 0.05).