In order to determine the standardized ileal digestible (SID) Ile:Lys requirement in finishing diets containing 20% DDGS, a 56-d study was conducted utilizing 2,268 pigs (DNA 600 x Topigs Norsvin 70, initially 82.3 kg). A total of 6 dietary treatments were fed, including a standard corn-soybean meal (SBM) diet and 5 diets containing 20% DDGS with SID Ile:Lys ratios of 55, 60, 65, 70, and 75%. Dietary treatments were assigned to pens, incompletely balancing for previous treatment, with each treatment being replicated 14 times. Pair-wise comparisons were used to evaluate the impact of dietary treatment on performance and carcass traits while single degree of freedom orthogonal polynomials were used to evaluate dose response of SID Ile:Lys in 20% DDGS diets. Increasing the SID Ile:Lys ratio in diets containing 20% DDGS did not impact pig growth performance criteria in a quadratic or linear fashion (P> 0.18). However, increasing the SID Ile:Lys ratio in 20% DDGS diets resulted in decreased back fat (BF; Quadratic, P = 0.01), increased loin depth (Quadratic, P=0.03), and tended to increase percent lean (Quadratic, P=0.07) with optimal carcass parameters occurring when 65% SID Ile:Lys was supplied in 20% DDGS diets. Pigs fed the corn-SBM diet had a similar final body weight (BW; P = 0.26) and cumulative average daily gain (ADG; P = 0.12) compared to pigs fed a 20% DDGS diet containing 70% SID Ile:Lys ratio and 3% greater cumulative average daily feed intake (ADFI) compared to pigs receiving diets with SID Ile:Lys ratios of 65 and 75% (P< 0.01). In conclusion, these results suggest that when feeding 20% DDGS in late finishing swine diets, a SID Ile:Lys ratio of 70% should be utilized when attempting to achieve similar overall growth performance relative to a corn-SBM diet.
High protein dried distiller grains are a novel protein source for commercial swine diets. Questions related to how concentrations of branched chain amino acids (BCAA) in corn protein sources affect pig performance remain. A randomized complete block design (RCBD) grow-finish experiment was conducted at the South Dakota State University Commercial Research Facility using NexPro® protein ingredient (HPDDG) to determine the performance response of grow-finish pigs fed corrected levels of BCAA through soybean meal (SBM) or synthetic amino acids (SAA). Pigs (n = 1,170; 59.5 ± 0.48 kg) were used in a 79-d study (9 replicates per treatment). Pens of pigs were allotted to one of five dietary treatments which consisted of 1) corn-SBM diet, 2) HPDDG not corrected for BCAA levels or HPDDG corrected for BCAA levels through additions of 3) SBM, 4) 50% SBM and 50% SAA blend or 5) SAA only. The HPDDG were included in diets at 15% in phase 1 and 10% in phases 2 and 3. Additions of SAA were included to maintain a SID Ile:Lys of 65% and SID Val:Lys of 75% for BCAA corrected diets. Data was analyzed as a RCBD, pair-wise comparisons and single degree of freedom orthogonal polynomials (BCAA corrected only) were used to evaluate treatment responses, and pen served as the experimental unit for all analyses. Reducing SBM in BCAA corrected diets decreased cumulative ADG and G:F (linear; P < 0.05). Decreasing SBM in BCAA corrected diets tended to decrease (linear; P = 0.09) standardized fat-free lean but increase (linear; P = 0.07) dressing percent and back fat depth (quadratic; P = 0.08) while not impacting hot carcass weight (P > 0.14). This data indicates HPDDG is a suitable feedstuff for grow-finish swine diets at low inclusion levels due to minimal impact on performance and carcass characteristics. Correction of BCAA levels through SBM inclusion provided an improved performance response compared to SAA only.
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