scholarly journals 198 Effects of different dietary standardized ileal digestible lysine specifications on growth performance of grow-finish pigs

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 56-57
Author(s):  
Ning Lu ◽  
Carine Vier ◽  
Wayne Cast ◽  
Uislei Orlando ◽  
Dan Hamilton ◽  
...  
Keyword(s):  
Growth Performance ◽  
Feed Intake ◽  
Block Design ◽  
Average Daily Gain ◽  
Experimental Unit ◽  
Randomized Complete Block Design ◽  
Similar Growth ◽  
Daily Gain ◽  
Growth Trial ◽  
Standardized Ileal Digestible Lysine

Abstract The objective was to determine the effects of different standardized ileal digestible (SID) lysine (Lys) specifications on performance of grow-finish pigs. A total of 2,106 pigs (PIC 359×Camborough, initially 22.0±0.43 kg) were used in a 72-d growth trial with 27 pigs per pen and 13 pens per treatment in a randomized complete block design. Pigs were fed corn-soybean-meal-based diets in three phases from 22-41, 41-62, and 62-91 kg body weight (BW). Treatments consisted of low (L) or high (H) SID Lys in each phase: LLL (1.05, 0.88, and 0.73%); LLH (1.05, 0.88, and 0.82%); LHH (1.05, 0.99, and 0.82%); HLL (1.18, 0.88, and 0.73%); HHL (1.18, 0.99, and 0.73%); and HHH (1.18, 0.99, and 0.82%). Lysine curves from PIC2008 and PIC2016 nutrient specification manuals were used to estimate SID Lys levels for L or H diets, respectively. Data were analyzed using generalized linear mixed models with pen as the experimental unit. From 22-41 kg, feeding high Lys improved (P< 0.10) average daily gain (ADG), feed efficiency (G:F), and final BW compared to low Lys. From 22-62 kg, feeding HH Lys increased (P< 0.05) ADG compared feeding LL or HL Lys. Pigs fed HH Lys or LH Lys had improved (P< 0.05) G:F compared to those fed LL Lys. Pigs fed LH or HH Lys had greater (P< 0.05) final BW compared to pigs fed HL. Pigs fed HH Lys had greater (P< 0.05) feed intake compared to pigs fed HL. From 22-91 kg, there was no evidence for differences in ADG, feed intake, G:F, or final BW. In summary, pigs fed 1.18% SID Lys had improved ADG, G:F, and final BW compared to pigs fed 1.05% SID Lys from 22-41 kg. Feeding a range of Lys specifications resulted in similar growth performance from 22-91 kg.

scholarly journals 450 Late-Breaking: Effects of bedding on feedlot receiving phase growth performance in beef steers during the winter in eastern South Dakota

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 141-142
Author(s):  
Dathan Smerchek ◽  
Zachary K Smith
Keyword(s):  
Metabolic Rate ◽  
South Dakota ◽  
Growth Performance ◽  
Block Design ◽  
Average Daily Gain ◽  
Experimental Unit ◽  
Beef Steers ◽  
Phase Growth ◽  
Randomized Complete Block Design ◽  
Daily Gain

Abstract Two-hundred and forty English × Continental beef steers (initial BW=365 kg [SD 22.5]) were used in a randomized complete block design to evaluate the effects of bedding application during a 36 d feedlot receiving phase on growth performance and efficiency during winter. Steers were allotted to 30 pens (n = 8 steers/pen) at the Ruminant Nutrition Center in Brookings, SD and pens were assigned to 1 of 2 treatments: 1) No bedding applied (NO) or 2) 1.8 kg (as-is basis) of wheat straw bedding/steer/d (BED). Due to the logistics of acquiring, weighing, and timely feeding of steers, the first 9 pen replicates began on test 14 d prior (begin: January 15, 2019 and end: February 20, 2019) to the last 6 pen replicates (begin: January 29, 2019 and end: March 6, 2019). Pen was the experimental unit; an α of 0.05 determined significance. Daily ambient temperature (n = 50) averaged -14.7°C [SD 5.63] and wind-chill (n = 50) averaged -17.7°C [SD 6.40]. Initial BW (365 vs. 365 ± 0.5 kg) and dry matter intake (8.19 vs. 8.22 ± 0.047 kg) did not differ (P ≥ 0.57) between NO and BED. End BW was greater for BED (P = 0.01; 419 vs. 402 ± 1.09 kg) compared to NO. Steers from BED had increased average daily gain (P = 0.01) by 48.0% and gain:feed (P = 0.01) by 49.2% over NO. Using tabular ingredient energy values and observed steer performance shrunk 4%, relative adjustments to metabolic rate were calculated. Estimated metabolic rate was elevated (P = 0.01) for NO (0.146 vs. 0.104 ± 0.0032 Mcal/BW0.75, kg). Bedding improves feedlot receiving phase growth and efficiency in eastern South Dakota during the winter. Under the environmental conditions of this experiment, steers have a 40.4% increased metabolic rate when bedding is not used and steers in bedded pens had a 35.1% increase in metabolic rate compared to (0.077 Mcal/BW0.75, kg).

scholarly journals PSII-20 Evaluation of Different Vitamin Concentrations in a Commercial Wean-to-Finish Program

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 170-171
Author(s):  
Robyn Thompson ◽  
Brandon Knopf ◽  
Carine Vier ◽  
Ning Lu ◽  
Wayne Cast ◽  
...  
Keyword(s):  
Vitamin E ◽  
Growth Performance ◽  
Feed Intake ◽  
Block Design ◽  
Average Daily Gain ◽  
Serum Vitamin ◽  
Experimental Unit ◽  
Final Body Weight ◽  
Dietary Treatments ◽  
Daily Gain

Abstract Our objective was to evaluate the effects of different vitamin concentrations on growth performance of wean-to-finish pigs under commercial conditions. A total of 900 barrows and gilts (PIC337×Camborough; initially 5.34±0.13 kg) were used in a 136-d growth trial with 25 pigs per pen and 12 pens per treatment in a randomized complete block design. Experimental diets were fed in 3 phases during nursery (5-6, 6-13, and 13-26 kg) and 5 phases during grow-finish (26-44, 44-65, 65-87, 87-108, and 108-128 kg). Dietary treatments consisted of: 1) NRC: vitamin concentrations following NRC (2012) recommendations; 2) PIC: vitamin concentrations following PIC (2016) recommendations; 3) Low-PIC: vitamin concentrations that ranged from 0 to 91% of PIC recommendations. Data were analyzed using the GLIMMIX procedure of SAS with pen as the experimental unit. During the nursery period, pigs fed PIC and Low-PIC diets had greater (P< 0.05) average daily feed intake (ADFI) compared to pigs fed NRC diets. There was no evidence (P >0.10) for differences in average daily gain (ADG) and feed efficiency (G:F). During the grow-finish period, there was no evidence (P >0.10) for differences in growth performance. During the overall wean-to-finish period, pigs fed PIC diets had lower (P< 0.05) ADG and final body weight compared to pigs fed NRC and Low-PIC diets. There was no evidence (P >0.10) for differences in ADFI or G:F. Pigs fed PIC diets had the greatest serum vitamin D3 at the end of nursery and finish periods (P< 0.05) and the greatest serum Vitamin E at the end of nursery period (P< 0.05). In summary, pigs fed PIC and Low-PIC diets had greater nursery feed intake and serum vitamin E and D3 concentrations compared to pigs fed NRC diets. Data from this study have demonstrated that pigs fed diets with reduced vitamin concentrations compared to PIC (2016) recommendations had improved wean-to-finish growth rate.

scholarly journals 73 Effects of dietary neutral detergent fiber and standardized ileal digestible lysine levels on growth performance and carcass characteristics of growing-finishing pigs

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 57-58
Author(s):  
Uislei Orlando ◽  
Ning Lu ◽  
Carine Vier ◽  
Wayne Cast ◽  
Xun Zhou ◽  
...  
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Average Daily Gain ◽  
Neutral Detergent Fiber ◽  
Feed Ratio ◽  
Experimental Unit ◽  
Finishing Pigs ◽  
Dietary Treatments ◽  
Daily Gain ◽  
Standardized Ileal Digestible Lysine

Abstract Our objective was to determine the effects of feeding different neutral detergent fiber (NDF) and standardized ileal digestible (SID) lysine (Lys) levels on performance of growing-finishing pigs from 30- to 130-kg. A total of 2,016 barrows and gilts (PIC 280×Camborough, initial BW of 29.6±0.53 kg) were allotted to a randomized complete block design with a 2×2 factorial arrangement. Dietary treatments (Table 1) consisted with two NDF levels (13% or 20%) and two SID Lys curves (PIC2008 or PIC2016). There were 21 mixed-sex pigs per pen, and 24 pens per treatment. The experiment diets were fed in 3 phases. Wheat, wheat by-products, peas, and canola oil were used with NRC (2012) loading values to achieve treatments, and all diets were formulated to be iso-caloric (2,420 kcal NE/kg). Experimental data were analyzed using generalized linear mixed models with pen as the experimental unit. Increasing NDF level resulted in a reduction (P< 0.05) in average daily gain (ADG), average daily feed intake, hot carcass weight, carcass yield, carcass ADG, and backfat depth (Table 2), and tended to decrease percentage of removals and mortality (P=0.10). Pigs fed PIC2016 Lys curve had greater ADG and carcass ADG as compared to those fed PIC2008 Lys curve (P< 0.05). There were NDF×Lys interactions (P< 0.10) for ADG, gain to feed ratio (G:F), carcass ADG, and carcass G:F. These response criteria were improved for pigs fed PIC2016 Lys curve compared to those fed PIC2008 Lys curve when NDF level was 13%; while no evidence of differences was observed at 20% NDF. Results indicate that increasing NDF level from 13 to 20% deteriorate performance of 30- to 130- kg pigs; and the improved growth performance of pigs fed PIC2016 Lys curve as compared to those fed PIC2008 Lys curve was only observed when lower NDF level was presented.

scholarly journals Effects of a dietary added formaldehyde-propionic acid blend on feed enterobacteria counts and on growing pig performance and fecal formaldehyde excretion

2014 ◽  
Vol 45 (3) ◽  
pp. 474-479 ◽  
Author(s):  
Maicon Sbardella ◽  
Danilo do Prado Perina ◽  
Carla de Andrade ◽  
Flavio Alves Longo ◽  
Valdomiro Shigueru Miyada
Keyword(s):  
Propionic Acid ◽  
Block Design ◽  
Average Daily Gain ◽  
Experimental Period ◽  
Experimental Unit ◽  
Design Experiment ◽  
Growing Pig ◽  
Randomized Complete Block Design ◽  
Pig Performance ◽  
Daily Gain

The purpose of this study was to evaluate the effects of a dietary added formaldehyde-propionic acid blend on feed enterobacteria counts and on growing pig performance and fecal formaldehyde excretion. Forty pigs (34.2±1.8kg BW) were used in a randomized complete block design experiment with four treatments, five replications per treatment and two animals per experimental unit (pen). The treatments were: 0.0, 1.0, 2.0, and 3.0g of blend kg-1 of feed. No effects (P>0.05) of dietary added blend levels were observed on average daily gain, average daily feed intake and feed:gain ratio during 1 to 14 and 1 to 28 days of experiment. Increasing dietary levels of blend reduced quadratically (P<0.01) total Enterobacteriaceae counts on 1st and 14th day after feed mixing, allowing to estimate, respectively, 2.63 and 3.35g kg-1 (average 2.99g kg-1) as the formaldehyde-propionic acid blend levels with lowest feed Enterobacteriaceae counts. Therefore, formaldehyde-propionic acid blend can reduce and/or control feed Enterobacteriaceae growth. There was no effect (P>0.05) of blend on fecal formaldehyde excretion on the 28th day of the experimental period. Therefore, the addition of dietary formaldehyde-propionic acid blend up to 3.0g kg-1 of feed reduces the Enterobacteriaceae counts until the 14th day after feed mixing, without any effects on growing pig performance and fecal formaldehyde excretion

scholarly journals Bedding Application to Feedlot Steers: Influence on Growth Performance, Estimated Maintenance Coefficient, Carcass Characteristics, and Circulating Metabolites in Beef Steers

Animals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1766
Author(s):  
Dathan Thomas Smerchek ◽  
Zachary Kidd Smith
Keyword(s):  
Growth Performance ◽  
Serum Insulin ◽  
Block Design ◽  
Average Daily Gain ◽  
Beef Steers ◽  
Feedlot Steers ◽  
Maintenance Coefficient ◽  
Randomized Complete Block Design ◽  
Red Angus ◽  
Daily Gain

Two randomized complete block design experiments were conducted to evaluate the effect of bedding use in confined beef steers. Experiment 1 used Simmental × Angus steers (n = 240; initial body weight (BW) = 365 ± 22.5 kg). Experiment 2 used newly weaned Charolais × Red Angus steers (n = 162; initial BW = 278 ± 13.4 kg). Steers were allotted to one of two treatments: (1) no bedding (NO), or (2) 1.8 kg (Experiment 1) or 1.0 kg (Experiment 2) of wheat straw (as-is basis) bedding/steer·d−1 (BED). In Experiment 1, applying bedding improved (p ≤ 0.01) dry matter intake (DMI), kg of gain to kg of feed (G:F), and average daily gain (ADG). Bedding reduced (p = 0.01) the estimated maintenance coefficient (MQ). Dressing percentage, rib fat, marbling, and yield grade were increased (p ≤ 0.03) in NO. Bedding resulted in an increase (p = 0.01) in serum insulin-like growth factor I (IGF-I). In Experiment 2, a tendency (p = 0.06) for increased DMI for NO was noted. Bedding improved G:F (p = 0.01). MQ was elevated (p = 0.03) for NO and NO had an increase (p = 0.02) in serum concentration of urea-N (SUN). An increase (p = 0.01) in serum non-esterified fatty acid was noted for NO. These data indicate that bedding application should be considered to improve growth performance and feed efficiency by reducing maintenance energy requirements in beef steers during the feedlot receiving and finishing phase.

PSVI-4 Effect of phytase on mineral digestibility and growth performance of pigs fed diets with pharmacological levels of Zn

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 400-401
Author(s):  
Charmaine D Espinosa ◽  
Deepak Velayudhan ◽  
Yueming Dersjant-Li ◽  
Janet Remus ◽  
Hans-Henrik H Stein
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Average Daily Gain ◽  
Positive Control ◽  
Negative Control ◽  
Metabolizable Energy ◽  
Randomized Complete Block Design ◽  
Quadratic Effects ◽  
Digestible Amino Acids ◽  
Daily Gain

Abstract An experiment was conducted to test the hypothesis that increasing levels of phytase increases mineral digestibility and growth performance of pigs fed diets with 3,000 mg/kg of Zn. A positive control (PC) diet that met nutrient requirements and a negative control (NC) diet that was deficient in total Ca (-0.16%), digestible P (-0.14%), metabolizable energy (-50 kcal/kg), and digestible amino acids (-0.02%) were formulated. Eight additional diets were formulated by adding 500, 1,000, 1,500, or 2,000 phytase units/kg of a novel bacterial 6-phytase (PhyG) or a commercial Buttiauxella phytase (PhyB) to the NC diet. A randomized complete block design with 400 weanling pigs (5.82 ± 0.70 kg), 10 diets, 4 pigs per pen, and 10 replicate pens per diet was used. Pigs were fed the experimental diets for 28 d. Fecal samples were collected from 1 pig per pen on d 26 to 28. Linear and quadratic effects of PhyG and PhyB were determined using polynomial contrast statements. Contrast statements were used to compare effects of PC diet with NC diet, and to compare effects of PhyG diets with PhyB diets. Overall, pigs fed the NC diet had reduced growth performance (P &lt; 0.05) compared with pigs fed the NC diet (Table 1). Linear (P &lt; 0.01) and quadratic (P &lt; 0.05) increases in overall average daily gain and average daily feed intake of pigs were observed as dietary concentrations of PhyG or PhyB increased. Increasing levels of PhyG or PhyB linearly increased (P &lt; 0.01) the apparent total tract digestibility (ATTD) of P and Ca. PhyG increased ATTD of P more (P &lt; 0.05) than PhyB. In conclusion, both phytases are effective in increasing mineral digestibility and growth performance in pigs fed diets with pharmacological levels of Zn; however, PhyG improved P digestibility more than PhyB.

99 Evaluation of IFTA NBS Alone and in Combination with Zinc Oxide on Antibiotic Free Programs During Nursery

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 52-53
Author(s):  
Gustavo Silva ◽  
Brandon Knopf ◽  
Beau A Peterson ◽  
Julia Pie ◽  
Carlos Domenech ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Block Design ◽  
Average Daily Gain ◽  
Random Effect ◽  
Residual Effect ◽  
Experimental Unit ◽  
Significant Difference ◽  
Randomized Complete Block Design ◽  
Similar Weight ◽  
Daily Gain

Abstract The objective was to evaluate the effect of IFTA NBS on productive performance in pigs from nursery until the end of 1st grow-finish phase. Total of 1,200 pigs (PIC 337 x 1050; PIC, Hendersonville, TN) were allotted in a randomized complete block design (RCBD) and assigned to blocks based on weight and sex, random allocated to pens with 25 pigs/pen. Diet changes occurred in 4 phases: N1 lasting 7 days, N2 14 days, N3 21 days and F1 21 days. Animals were random assigned to 4 treatments: T1) zinc oxide (ZnO) during N1 (3000 ppm) and N2 (2500 ppm) with no antibiotics; T2) carbadox at 50 g/ton in N1 and N2; T3) IFTA NBS at 500 g/ton during N1, N2 and N3; and T4) IFTA NBS at 500 g/ton during N1, N2 and N3 along with ZnO in N1 (3000 ppm) and N2 (2500 ppm). Treatments were fed a common diet during F1. Outcomes were analyzed as RCBD using SAS PROC GLIMMIX with pen as experimental unit, treatment as main effect and block as random effect. There were significant differences (P &lt; 0.05) in weights and average daily gain (ADG) between T2 and T3 during N2. Significant differences on average daily feed intake (ADFI) were observed between T1 and T2 vs. T3 during N2, and between T2 and T3 during N3. During nursery period (N1-N3), ADG and ADFI were different (P &lt; 0.05) between T2 and T3. By the end of the trial, a significant difference in gain:feed between T2 and T3 was detected. Under the conditions of this study, IFTA NBS in combination with ZnO could replace carbadox as it obtained similar weight and FCR during nursery. In addition, the response on gain:feed during the first grow-finish phase deserves further investigation since suggests a beneficial residual effect of IFTA NBS.

142 Evaluation of Proso Millet as a Partial or Complete Replacement for Corn in Growing-finishing Diets for Pigs

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 71-72
Author(s):  
Khang A Nguyen ◽  
Melanie D Trenhaile-Grannemann ◽  
Thomas Burkey ◽  
Phillip Miller
Keyword(s):  
Growth Performance ◽  
Soybean Meal ◽  
Block Design ◽  
Average Daily Gain ◽  
Experimental Unit ◽  
Finishing Pigs ◽  
Complete Replacement ◽  
Proso Millet ◽  
Dietary Treatments ◽  
Daily Gain

Abstract An experiment was conducted to evaluate the effects of increasing the inclusion of proso millet on the growth performance of growing and finishing pigs. Using a randomized complete block design, 36 crossbred barrows, with an average initial weight of 22.2 kg, were randomly assigned to 1 of 4 dietary treatments (9 pens/treatment; 1 pig/pen). Diet 1 was corn-soybean meal-based (control) and Diets 2, 3, and 4 had proso millet replacing 33%, 67%, and 100%, respectively, of corn in the control diet. The diets were formulated according to 4 growth phases (P1, 25 to 50 kg BW; P2, 50 to 75 kg BW; P3, 75 to 100 kg BW; and P4, 100 to 135 kg BW) with nutrient contents formulated according to NRC (2012) recommendations. Data were analyzed using the GLIMMIX procedure of SAS, using pig as the experimental unit. In P1 and P2, no differences in average daily gain (ADG) or average daily feed intake (ADFI) were observed among treatments (P &gt; 0.3). In P3, pigs consuming the proso millet diets had greater ADFI than pigs consuming the basal diet, especially pigs fed Diet 4 compared to pigs fed Diet 1 (3.66 vs. 3.29 kg; P &lt; 0.01). The ADG:ADFI ratio was not affected (P &gt; 0.1) by treatments during this period. In P4, although there was a difference in ADFI between pigs fed Diet 3 and Diet 1 (3.8 vs. 3.47 kg; P = 0.04), no decreases in ADG:ADFI ratio were observed among the four dietary treatments (P &gt; 0.5). Average daily gain was not affected (P &gt; 0.3) by treatments during the growing-finishing period, suggesting that the level of corn replacement up to 100% by proso millet did not affect pig growth. In conclusion, proso millet was shown to effectively replace corn in corn-soybean meal-based diet for growing-finishing pigs without compromising growth performance.

159 Evaluation of Bacillus Subtilis PB6 Probiotic (CLOSTAT® 500) on Feedlot Phase Growth Performance, Efficiency of Dietary Net Energy Utilization, and Fecal and Subiliac Lymph Node Salmonella Prevalence

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 119-120
Author(s):  
Zachary K Smith ◽  
Paul Rand R Broadway ◽  
Keith Underwood ◽  
Warren C Rusche ◽  
Julie Walker ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Lymph Node ◽  
Lymph Nodes ◽  
Growth Performance ◽  
Block Design ◽  
Average Daily Gain ◽  
Energy Utilization ◽  
Experimental Unit ◽  
Net Energy ◽  
Fecal Samples

Abstract Yearling beef steers (n = 238; initial BW=402 ± 31.2 kg) were used to evaluate a Bacillus subtilis probiotic on growth performance, dietary net energy (NE) utilization, carcass characteristics, and fecal and subiliac lymph node Salmonella prevalence during a 140-d finishing period. Steers were allotted to 24 pens (n = 9 to 10 steers/pen) and assigned to one of two treatments (12 pens/treatment): no probiotic (CON) or 0.50 g·steer-1·d-1 of a Bacillus subtilis PB6 probiotic (CLOSTAT® 500, Kemin Industries, Des Moines, IA; CLO). Steers were transitioned to a 90% concentrate diet (DM basis) over 14-d. Steers were fed once daily at 0700 h; bunks were managed according to a slick bunk management. Fecal samples were collected on d 1, 28, 56, 112, and 140 from each pen (n = 5 steers/pen) via rectal palpation and composited by pen for determination of Salmonella prevalence. Upon harvest, subiliac lymph nodes were obtained from 60 steers in CON and 57 steers in CLO. Data were analyzed as a randomized complete block design; pen was the experimental unit; α of 0.05 determined significance. No differences were detected (P ≥ 0.25) between treatments for live or carcass-adjusted average daily gain, dry matter intake, gain efficiency, dietary NE utilization, nor calculated dietary NE content based upon performance. No differences were detected between treatments for any carcass traits (P ≥ 0.15). Salmonella was not recovered in any fecal samples except on d 112, where steers from CLO had a numerically lower (P = 0.17; 8.3 vs. 25.0%) incidence of fecal Salmonella compared to CON and on d 140 fecal, where Salmonella incidence did not differ (P = 0.34; 0.0 vs. 8.3%) for CON and CLO, respectively. Salmonella was not recovered in any subiliac lymph nodes. These data indicate that CLO did not influence growth performance or Salmonella prevalence.

172 Effects of Dietary Valine, Isoleucine, and Tryptophan Supplementations to Diets Containing Excess Leucine from Corn Protein on Growth Performance of Growing Pigs

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 61-62
Author(s):  
Woongbi Bi Kwon ◽  
Jose A Soto ◽  
Hans H Stein
Keyword(s):  
Block Design ◽  
Control Diet ◽  
Average Daily Gain ◽  
Growing Pigs ◽  
Experimental Unit ◽  
Negative Effects ◽  
Final Body Weight ◽  
Corn Protein ◽  
Dietary Treatments ◽  
Daily Gain

Abstract An experiment was conducted to test the hypothesis that addition of Val, Ile, or Trp alone or in combination will reduce the negative effects of excess Leu in diets for growing pigs. A total of 288 growing pigs (28.6 ± 2.5 kg) were randomly assigned to 1 of 9 dietary treatments in a randomized complete block design. There were 2 barrows and 2 gilts in each pen and 8 replicate pens per treatment. A control diet based on corn and soybean meal and 8 diets based on corn and a high-protein corn product (48% crude protein) with 2 levels of crystalline L-Val (0 or 0.10%), L-Ile (0 or 0.10%), and L-Trp (0 or 0.05%) were formulated. The crystalline L-Val, L-Ile, and L-Trp increased standardized ileal digestible (SID) Val:Lys from 70 to 80%, SID Ile:Lys from 53 to 63%, and SID Trp:Lys from 18 to 23%, respectively. All diets were formulated to contain 1.00% SID Lys and the 8 diets containing corn protein contained 171% SID Leu:Lys. Individual pig weights were recorded at the beginning and at the conclusion of the 28-d experiment. Data were analyzed using the PROC MIXED of SAS with a pen as the experimental unit. Diet was the fixed effect and block and replicate within block were random effects. Results indicated that final body weight and average daily gain were not different between pigs fed the control diet and pigs fed the diet with Val and Trp addition, but greater (P &lt; 0.001) than for pigs fed the diet with Val addition, Ile addition, Trp addition, Val and Ile addition, Ile and Trp addition, or Val, Ile, and Trp addition (Table 1). In conclusion, addition of Val and Trp to diets with excess Leu may prevent negative effects of excess Leu in diets for growing pigs.

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