Amino Acid Digestibility and Energy Content of Deoiled (Solvent Extracted) Corn Dried Distillers Grains with Solubles for Swine and its Effects on Growth Performance and Carcass Characteristics

January 26, 2011 — 

A study with three experiments were conducted to determine the AA digestibility and energy concentration of deoiled (solvent extracted) corn dried distillers grains with solubles (dDGS) and evaluate its effect on nursery pig growth performance and finishing pig growth performance and carcass traits. In Exp. 1, 5 growing barrows (initially, 30.8 kg BW) were fitted with a T-cannula in the distal ileum and allotted to 1 of 2 treatments: (1) diet with dDGS as the sole protein source or (2) an N-free diet for determining basal endogenous AA losses in a crossover design at 68.0 kg BW. Apparent (AID) and standardized (SID) ileal digestibility of AA and energy concentration of dDGS were determined. In Exp. 2, a total of 210 pigs (initial BW, 9.9 kg) were used in a 28-d experiment to evaluate the effect of dDGS on nursery pig performance. Pigs were allotted to 5 dietary treatments (0, 5, 10, 20, or 30% dDGS) formulated to contain equal ME (increased added fat with increasing dDGS) and SID Lys concentrations based on the values obtained from Exp. 1. In Exp. 3, a total of 1,215 pigs (initially, 29.6 kg BW) were used in a 99-d experiment to determine the effect of dDGS on growth and carcass characteristics of finishing pigs. Pigs were allotted to dietary treatments similar to those used in Exp. 2 and were fed in 4 phases. The analyzed chemical composition of dDGS in Exp. 1 was 35.6% CP, 5.29% ash, 4.6% fat, 18.4% ADF, and 39.5% NDF on a DM basis. Apparent ileal digestibilities of Lys, Met, and Thr in dDGS were 47.2, 79.4, and 64.1%, respectively, and SID were 50.4, 80.4, and 68.9%, respectively. The determined GE and DE and calculated ME and NE values of dDGS were 5,098, 3,100, 2,858, and 2,045 kcal/kg DM, respectively. In Exp. 2, nursery pig ADG, ADFI, and G:F were similar among treatments. In Exp. 3, increasing dDGS reduced (linear; P < 0.01) ADG and ADFI but tended to improve (linear; P = 0.07) G:F. Carcass weight and yield were reduced (linear; P < 0.01), loin depth tended to decrease (linear; P = 0.09), and carcass fat iodine values increased (linear; P < 0.01) as dDGS increased. There was no difference in backfat, percentage lean, or fat-free lean index among treatments. In conclusion, dDGS had greater CP and AA but lower energy content than traditional DDGS. Also, when dietary fat was added to diets to offset the lower ME content, feeding up to 30% dDGS did not affect growth performance of nursery pigs but negatively affected ADG, ADFI, and carcass fat quality of finishing pigs.

Jacela JY, Derouchey JM, Dritz SS, Tokach MD, Goodband RD, Nelssen JM, Sulabo RC, Thaler RC, Brandts L, Little DE, Prusa KJ; Amino acid digestibility and energy content of deoiled (solvent extracted) corn dried distillers grains with solubles for swine and its effects on growth performance and carcass characteristics; J Anim Sci. 2011 Jan 21. [Epub ahead of print]