scholarly journals 80 Determining the effects of tryptophan biomass on growth performance of 11 to 23 kg nursery pigs

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 43-43
Author(s):  
Madison R Wensley ◽  
Jason C Woodworth ◽  
Joel M DeRouchey ◽  
Steve S Dritz ◽  
Mike D Tokach ◽  
...  
Keyword(s):  
Block Design ◽  
Positive Control ◽  
Negative Control ◽  
Experimental Unit ◽  
Growth Data ◽  
Nursery Pigs ◽  
Nursery Pig ◽  
Pig Performance ◽  
Dietary Treatments ◽  
Growth Trial

Abstract A total of 320 barrows (DNA 200×400, initially 11.3 ± 0.65 kg BW) were used in a 21-d growth trial evaluating the effects of feeding Trp biomass (CJ America-Bio, Downers Grove, IL) as a source of Trp on nursery pig performance. Pigs were weaned at approximately 21 d of age, placed in pens based on initial BW, and fed a common diet. On d 21 after weaning, pigs were weighed and pens were allotted to 1 of 4 dietary treatments with 5 pigs/pen and 16 replicates/treatment. Dietary treatments included a negative control (16% SID Trp:Lys), positive control (21% SID Trp:Lys from crystalline L-Trp), or diets containing Trp biomass to provide 21 or 23.5% SID Trp:Lys (included at 0.104 or 0.156% of the diet, respectively). Diets were corn-soybean meal based and contained 1.25% SID Lys with other AA set to meet or exceed NRC (2012) requirement estimates. The Trp biomass contained 69% Trp. Growth data were analyzed as a randomized complete block design using PROC GLIMMIX of SAS with pen as the experimental unit. Overall (d 0 to 21) pigs fed 21% Trp from L-Trp or Trp biomass had increased (P < 0.05) ADG compared to the control, with pigs fed the 23.5% SID Trp biomass intermediate. Pigs fed the 21% Trp from Trp biomass had improved (P < 0.05) G:F compared to the control with others intermediate. In conclusion, Trp biomass is a viable alternative to crystalline Trp, but further evaluation at higher inclusion levels is needed.

scholarly journals PSVI-14 Interactive effects of Cordyceps mushroom powder and carbadox on nursery pig performance

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 207-208
Author(s):  
Jacob A Richert ◽  
Jorge Y P Palencia ◽  
Clayton S Chastain ◽  
Morgan T Thayer ◽  
Brian T Richert ◽  
...  
Keyword(s):  
Positive Control ◽  
Interactive Effects ◽  
Experimental Unit ◽  
Nursery Pigs ◽  
Feeding Program ◽  
Nursery Pig ◽  
Copper Zinc ◽  
Pig Performance ◽  
Dietary Treatments ◽  
Growth Trial

Abstract The objective was to evaluate the independent and additive effects of Cordyceps mushroom powder and carbadox to pharmacological copper+zinc in nursery pig diets. Two hundred-ten crossbred weanling pigs [(Duroc × (York × Landrace)] avg. 19 d of age and 5.8 kg were used in a 33 day growth trial. Pigs were alloted by weight, sex, ancestry, and assigned to body weight (BW) blocks. Within BW blocks, sex ratios were constant in each pen. Pen was the experimental unit and growth performance was analyzed using BW, ADG, ADFI, and G:F. There were 7 pigs/pen and 6 pens/treatment. Treatments were: 1) a negative diet (NC); 2) positive control (PC; Carbadox, 55 ppm); 3) NC+300 ppm Cordyceps mushroom powder (NC+MP); 4) PC +300 ppm mushroom(PC+MP); 5) supplemental copper sulfate (125 ppm) and zinc oxide (3000 ppm d 0-7, 2000 ppm d 7-35), CuZn. Dietary treatments were fed in a four-phase feeding program (d0-7, d7-14, d14-21, and d21-33). There were no interactions between MP and Carbadox at any time point (P > 0.10). Pigs fed the PC, PC+MP and CuZn treatment had increased BW (P < 0.05), ADG (P < 0.05), ADFI (P < 0.10) and G:F (P < 0.05) over the NC at the end of phases 1, 2, and 3, with no main effect of MP treatment. During Phase 4, pigs fed MP, PC, and CuZn diets all had increased ADG (P < 0.05; 431, 477, 455, 505, 486 g/d, diet 1-5, respectively) and ADFI (P < 0.05) over the NC fed pigs. Overall, d0-33, PC diets and CuZn supplemented pigs had increased ADG (P < 0.05) and ADFI (P < 0.05), with pigs fed MP tending to have increased ADFI (P < 0.08) over NC fed pigs. Feeding nursery pigs pharmacological levels of Cu+Zn and carbadox have economical value to increase nursery pig performance with MP may increase pig ADFI and final BW through potentially complimentary modes of action.

scholarly journals 176 Evaluation of a novel threonine source for nursery pig diets

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 85-86
Author(s):  
Dalton Humphrey ◽  
Spenser Becker ◽  
Jason Lee ◽  
Keith Haydon ◽  
Laura L Greiner
Keyword(s):  
Growth Performance ◽  
Positive Control ◽  
Negative Control ◽  
Experimental Unit ◽  
Nursery Pigs ◽  
Nursery Pig ◽  
Weaning Pigs ◽  
Dietary Treatments ◽  
Similar Growth ◽  
Source Test

Abstract Four hundred and eighty (PIC 337 X 1050, PIC Genus, Hendersonville, TN) pigs were used to evaluate a novel threonine source (ThrPro, CJ America-Bio, Fort Dodge, IA) for nursery pigs from approximately 7 kg to 20 kg. At weaning, pigs were sorted by gender and fed a common diet for one week. Upon completion of the first week, pigs were sorted into randomized complete blocks, equalized by weight, within 16 replications. Pigs were allocated to one of three dietary treatments: positive control (POS)-SID LYS:THR 0.60, negative control (NEG)-SID LYS:THR ≤0.46 and alternative threonine source (TEST)-SID LYS:THR 0.60. All other nutrients met or exceeded the NRC (2012) recommendations. Growth and intake data were analyzed using PROC MIXED procedure in SAS. The experimental unit was the pen. During the first 14 days, pigs fed TEST had similar ADG (0.417 vs. 0.414 kg/d, P=0.81) and G:F (0.977 vs. 1.030, P=0.18) compared to POS, and increased ADG (0.417 vs. 0.387 kg/d, P=0.01) and G:F (0.977 vs. 0.898, P=0.05) compared to NEG. Over days 14-28, pigs fed TEST had similar ADG (0.523 vs. 0.532 kg/d, P=0.49) and G:F (0.712 vs. 0.707, P=0.71) compared to POS, and increased ADG (0.523 vs. 0.479 kg/d, P=0.002) and G:F (0.712 vs. 0.627, P&lt; 0.0001) compared to NEG. Overall (d 0 to 28), pigs fed TEST had similar ADG (0.466 vs. 0.474 kg/d, P=0.48) and G:F (0.808 vs. 0.816, P=0.55) compared to POS, and increased ADG (0.466 vs. 0.433 kg/d, P=0.002) and G:F (0.808 vs. 0.725, P&lt; 0.0001) compared to NEG. ADFI was not significantly different across treatments for the entirety of the study. In conclusion, the replacement of L-threonine with a novel threonine source resulted in similar growth performance in nursery pigs from approximately 7 kg to 20 kg.

scholarly journals PSVI-19 Evaluating the effects of day of iron injection after farrowing on nursery performance and hematological criteria

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 209-210
Author(s):  
Hayden E Williams ◽  
Cierra Roubicek ◽  
Joel M DeRouchey ◽  
Jason C Woodworth ◽  
Steve S Dritz ◽  
...  
Keyword(s):  
Animal Health ◽  
Negative Control ◽  
Repeated Measure ◽  
Experimental Unit ◽  
Injection Timing ◽  
Growth Data ◽  
Significant Treatment ◽  
Randomized Design ◽  
Nursery Pig ◽  
Pig Performance

Abstract Weaned pigs (n = 311; 5.9 kg BW) were used in a 59-d study evaluating the effects of Fe injection timing after birth on nursery pig performance and hematological criteria. Pigs were weaned at 21 d and allotted to pens based on preweaning Fe treatment with BW balanced across pens within a treatment with 5 or 6 pigs/pen and 10 pens/treatment. The preweaning treatments were a negative control receiving no Fe injection or 200-mg of injectable Fe (Gleptoforte, Ceva Animal Health, Lenexa, KS) provided in a single injection on d 2, 4, 6, 8, or 10 after birth. All pigs were fed common diets after weaning that contained 110 mg/kg of added Fe as FeSO4 provided from the trace mineral premix. Growth data were analyzed as a completely randomized design with pen as the experimental unit. Hematological criteria were measured as a repeated measure with pig as the experimental unit. Overall, increasing the age of pigs receiving a 200-mg Fe injection from 2 to 4 or 6 d after birth increased (quadratic; P = 0.013) d 80 ending BW with a decrease in BW when Fe was provided on d 8 or 10 (Table 1). Not providing an Fe injection after birth worsened (P < 0.05) ADG, ADFI, and d 80 ending BW. Significant treatment×day interactions (P < 0.001) were observed for Hgb and Hct values. These interactions occurred because pigs not receiving an Fe injection after birth had values that increased from d 21 to 35 while pigs receiving an Fe injection had values that decreased from d 21 to 35. While it is common practice to provide an Fe injection within the first 48 hours of birth, these results suggest delaying injection until d 4 or 6 may increase nursery final weight.

scholarly journals PSV-13 Effects of increasing iron dosage in newborn pigs on subsequent nursery performance and hematological criteria

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 196-197
Author(s):  
Hayden E Williams ◽  
Joel M DeRouchey ◽  
Jason C Woodworth ◽  
Steve S Dritz ◽  
Mike D Tokach ◽  
...  
Keyword(s):  
Growth Performance ◽  
Animal Health ◽  
Negative Control ◽  
Repeated Measure ◽  
Experimental Unit ◽  
Growth Data ◽  
Significant Treatment ◽  
D 63 ◽  
Nursery Pig ◽  
Pig Performance

Abstract Weaned pigs (n = 308; 5.7 kg BW) were used in a 42-d study evaluating the effects of increasing injectable Fe dose at processing (d 3 after farrowing) on subsequent nursery pig performance and hematological criteria. Pigs were weaned on d 21 and allotted to pens based on previous Fe treatment with BW balanced across pens within a treatment with 5 or 6 pigs/pen and 10 pens/treatment. Treatments applied at processing were a negative control receiving no Fe injection or increasing injectable Fe (Gleptoforte, Ceva Animal Health, Lenexa, KS) to provide 50, 100, 150, 200-mg, or 200-mg plus 100-mg on d 11 post-farrowing. All pigs were fed the same diets after weaning containing 110 mg/kg of Fe from FeSO4 provided from the trace mineral premix. Growth data were analyzed as a CRD with pen as the experimental unit. Hematological criteria were analyzed as a repeated measure with pig as the experimental unit. Overall, increasing injectable Fe improved (linear; P < 0.05) ADG and ADFI (Table 1). Increasing injectable Fe up to 150 mg improved (quadratic; P = 0.011) G:F with a worsening G:F thereafter. There was no evidence of difference in growth performance (P > 0.10) between the 200-mg and the 200 + 100 mg injectable Fe treatments. Significant treatment×day interactions (P < 0.001) were observed for Hgb and Hct because pigs receiving an Fe injection less than 150-mg had increasing values through nursery while all other pigs had values remaining constant until d 63 after birth with no evidence of difference (P > 0.10) amongst all treatments at d 63 after birth. These results suggest that providing a 200-mg Fe injection at processing provides the greatest growth performance in the nursery and Fe in the diet is sufficient to meet the pigs’ Fe requirement to restore blood Fe status at the end of the nursery.

scholarly journals PSV-21 effects of soybean meal and net energy level on nursery pig performance

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 203-203
Author(s):  
Brittany Carrender ◽  
Hayden E Williams ◽  
Joel M DeRouchey ◽  
Mike D Tokach ◽  
Steve S Dritz ◽  
...  
Keyword(s):  
Soybean Meal ◽  
Removal Rate ◽  
Block Design ◽  
Positive Control ◽  
Control Treatment ◽  
Net Energy ◽  
Growth Data ◽  
Randomized Complete Block Design ◽  
Nursery Pig ◽  
Pig Performance

Abstract Nursery pigs (n = 3,796; 17.6 kg BW) were used in a 22-d study evaluating the effects of increasing soybean meal on nursery pig performance. At 8 weeks of age, pens were allotted to treatment based on location in a randomized complete block design with 39 to 40 pigs per pen. Ten pens were placed on the positive control treatment and 12 pens placed on all other treatments. Experimental diets were fed in one phase (d 0 to 22) in meal form. Treatments included a positive control diet with 40% soybean meal and 1.8% choice white grease. Six diets were formulated with increasing soybean meal (17.5 to 40%) without added fat. Pigs were weighed on d 0, 13, and 22 to determine ADG, ADFI, G:F and NE efficiency. Growth data were analyzed as a randomized complete block design with pen as the experimental unit. Growth data were evaluated using linear and quadratic effects of soybean meal level and a pairwise comparison of the 40% soybean meal treatments with and without added fat. An outbreak of E. coli-associated disease was noted in the first 2 weeks of the experiment. Overall, increasing soybean meal tended to decrease (linear; P = 0.070) ADG, decreased (linear; P = 0.0001) ADFI, improved (linear; P = 0.0001) G:F and caloric efficiency, and reduced (linear; P = 0.050) removal rate (Table 1). Pigs fed the positive control had decreased (P = 0.019) ADFI and improved (P = 0.001) G:F compared to pigs fed the 40% soybean meal diet without added fat. These results suggest the net energy value for soybean meal was underestimated in diet formulation. Increasing soybean meal level in the diet reduced removal rate, suggesting soybean meal may provide added health benefits beside amino acids and energy.

scholarly journals 178 Efficacy of commercial products on growth performance of nursery pigs fed diets with fumonisin-contaminated corn

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 78-79
Author(s):  
Zhong-Xing Rao ◽  
Mike D Tokach ◽  
Steve S Dritz ◽  
Jason C Woodworth ◽  
Joel M DeRouchey ◽  
...  
Keyword(s):  
Growth Performance ◽  
Wide Spectrum ◽  
Block Design ◽  
Control Diet ◽  
Positive Control ◽  
Negative Control ◽  
Experimental Unit ◽  
Negative Effects ◽  
Commercial Products ◽  
Nursery Pigs

Abstract Two experiments were conducted to determine the efficacy of commercial products on growth performance of nursery pigs fed high fumonisin diets. In Exp. 1,350 pigs (241 × 600; DNA; initially 9.9 kg) were used with 5 pigs per pen and 14 pens per treatment. Five dietary treatments consisted of a positive control (low fumonisin, 4 ppm fumonisin; FB1 + FB2), negative control (50 ppm fumonisin;) and the negative control with one of three products (0.3% of Kallsil Dry, Kemin Industries Inc., Des Moines, IA; 0.3% of Feed Aid Wide Spectrum, NutriQuest, Mason City, IA; 0.17% of Biofix Select Pro, Biomin America Inc., Overland Park, KS). Diets were fed for 14 d. Pens were assigned to treatments in a randomized complete block design with initial weight as the blocking factor. Data were analyzed using nlme package in R program (version 3.5.2) with pen as experimental unit. Pigs fed the negative control, or diets with Kallsil Dry or Feed Aid had decreased (P&lt; 0.05) ADG, ADFI, and G:F compared with those fed the positive control and diet with Biofix. Pigs fed the positive control diet had decreased (P&lt; 0.05) d 14 serum sphinganine to sphingosine (Sa:So) ratio than those fed other diets. In Exp. 2, 300 pigs (241 × 600; initially 10.4 kg) were used and fed experimental diets for 28 d. Procedures were similar to Exp. 1 except there were 12 replicates per treatment and diets contained 30 ppm fumonisin. Pigs fed the negative control, or diets with Kallsil Dry or Feed Aid had decreased (P&lt; 0.05) ADG and G:F, and greater (P&lt; 0.05) d 14 and 28 Sa:So ratios compared with the positive control and diet with Biofix. In summary, adding Biofix to high fumonisin diets mitigated the negative effects of fumonisin while Kallsil Dry and Feed Aid did not.

scholarly journals 172 Standardized total tract digestible phosphorus requirement of 11- to 23-kg pigs fed diets containing phytase

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 97-98
Author(s):  
Carine M Vier ◽  
Steve S Dritz ◽  
Mike D Tokach ◽  
Jason C Woodworth ◽  
Robert D Goodband ◽  
...  
Keyword(s):  
Block Design ◽  
Experimental Unit ◽  
Nursery Pigs ◽  
Nonlinear Mixed Models ◽  
Feed Cost ◽  
Randomized Complete Block Design ◽  
Phosphorus Requirement ◽  
Dietary Treatments ◽  
Quadratic Models ◽  
Growth Trial

Abstract The objective of this study was to determine the standardized total tract digestible phosphorus (STTD P) requirement of nursery pigs from 11 to 23 kg fed diets containing 1,000 phytase units (FYT). A total of 2,140 barrows and gilts (PIC 359×Camborough, initial BW 11.1 ± 0.24 kg) were used in a 21-d growth trial with 24 to 27 pigs per pen and 12 pens per treatment in a randomized complete block design. The 7 dietary treatments consisted of 0.30, 0.33, 0.38, 0.43, 0.48, 0.53, and 0.58% STTD P, which represented 90, 100, 115, 130, 145, 160 and 175%, respectively, of the NRC (2012) requirement estimate for STTD P for pigs weighing 11 to 23 kg. All diets contained 1,000 FYT of Ronozyme Hiphos 2500 (DSM Nutritional Products, Inc., Parsippany, NJ) with assumed release values of 0.15% available P and 0.132% STTD P. Treatments were achieved by increasing the amount of calcium carbonate and monocalcium phosphate at the expense of corn, while maintaining a similar 1.17:1 total Ca:total P ratio across treatments. Experimental data were analyzed with pen as the experimental unit, using generalized linear and nonlinear mixed models, which included quadratic polynomial, broken-line linear, and broken-line quadratic models. Increasing STTD P quadratically improved (P < 0.05) ADG and feed efficiency (G:F). Final BW and ADFI increased linearly (P < 0.05) up to the highest STTD P level. Income over feed cost improved quadratically (P < 0.05), with the highest income observed at 0.43% STTD P. The broken-line linear plateau was estimated at 0.40% STTD P for ADG and at 0.37% STTD P for G:F. In conclusion, the estimated STTD P requirement for nursery pigs from 11 to 23 kg fed diets containing 1,000 FYT were greater than NRC (2012) requirement estimates and ranged from 0.37 to 0.43% to optimize performance and economic return.

185 The Impacts of Commercial Dietary Acidifiers on Growth Performance of Nursery Pigs

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 87-87
Author(s):  
Payton L Dahmer ◽  
Cassandra K Jones
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Phase 1 ◽  
Dietary Treatment ◽  
Negative Control ◽  
Experimental Unit ◽  
Nursery Pigs ◽  
Commercial Diet ◽  
Randomized Block Design ◽  
Pig Performance

Abstract A total of 360 weanling pigs (DNA 200 x 400; initially 9.7 ± 0.23 kg BW) were used in a 21-d growth trial to evaluate the effects of commercial diet acidifiers in nursery diets. Upon weaning, pigs were weighed and allotted to pens (6 pigs/pen, 10 replicate pens/treatment, blocked by 2 separate nursery rooms) and pens were then randomly assigned to one of 6 treatment diets: 1) negative control (no antibiotics or acidifiers) and the control with 2) 0.25% Acidifier A (KEM-GEST™, Kemin Industries, Des Moines, IA); 3) 0.3% Acidifier B (ACITVATE® DA, Novus International, Saint Charles, MO); 4) 0.5% Acidifier C (OutPace®, PMI Additives, Arden Hills, MN); 5) 50 g/ton carbadox; 6) 400 g/ton chlortetracycline. Pigs were fed common phase 1 and phase 2 starter diets without antimicrobials for 21 days, then fed experimental diets for 21 days. Data were analyzed as a completely randomized block design with pen as the experimental unit. Dietary treatment significantly impacted (P &lt; 0.05) all growth response criteria for each week of the experiment. Overall (d 0 to 21), ADG was the greatest (P &lt; 0.0001) for pigs fed a diet containing CTC. Likewise, ADFI was increased (P &lt; 0.0001) for pigs consuming CTC compared to those fed the negative control, acidifier A, acidifier B and carbadox diets, while those fed acidifier C were intermediate. Feed efficiency was poorest (P &lt; 0.0001) in pigs fed a diet with carbadox. By the end of the experiment, pigs fed CTC were significantly heavier (P &lt; 0.0001) than pigs fed all remaining treatments. In summary, feeding CTC improved nursery pig performance while carbadox unexpectedly reduced it. The addition of dietary acidifiers did not improve growth performance compared to a negative control.

scholarly journals PSIII-35 The effects of cold pelleting and separation of fine corn particles on growth performance of nursery pigs

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 371-371
Author(s):  
Caitlin E Evans ◽  
Marut Saensukjaroenphon ◽  
Haley Wecker ◽  
Jason C Woodworth ◽  
Cassandra K Jones ◽  
...  
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Hot Water ◽  
Nursery Pigs ◽  
Complete Diet ◽  
Randomized Complete Block Design ◽  
Nursery Pig ◽  
Pig Performance ◽  
Dietary Treatments ◽  
Ground Corn

Abstract A total of 320 pigs (DNA 241×600; initially 10.2 kg BW) were utilized in a 21-d experiment to determine the effects of corn fractionation and pelleting technique on nursery pig growth performance. There were 5 pigs per pen, 8 pens per treatment and 8 dietary treatments in a randomized complete block design. Treatments 1–3 contained 400 µm ground corn and were fed as either mash, pelleted using a steam conditioner plus traditional vertical ring die (steam pellet) or pelleted with hot water plus a horizontal die (cold pellet). Treatments 4–6 contained corn ground to 400 µm with fines &lt; 150 um removed and were fed as either mash, steam pellet or cold pellet. Treatments 7 and 8 contained ground corn with only fines &lt; 150 um steam or cold pelleted prior to dietary inclusion without complete diet pelleting. Overall, pigs fed mash diets had improved (P &lt; 0.05) ADG and d 21 BW compared to those fed steam pelleted diets with those fed cold pelleted diets being intermediate. There was no difference in G:F between pigs fed mash, steam pellet and cold pellet diets; however, pigs fed diets containing pelleted fines had decreased (P &lt; 0.05) G:F due to an observed increased feed wastage and sorting. There was no difference in growth performance between pigs fed diets with fines removed or not. Cold pelleting was a viable option to steam pelleting in the current experiment; however, pelleting diets reduced pig performance compared to pigs fed mash diets, which was unexpected. Further research is needed to validate the response to cold pelleting when the expected response to pelleting using steam conditioning is achieved.

scholarly journals Evaluation of a novel threonine source for nursery pig diets

2020 ◽  
Vol 4 (4) ◽  
Author(s):  
Dalton Humphrey ◽  
Spenser Becker ◽  
Jason Lee ◽  
Keith Haydon ◽  
Laura Greiner
Keyword(s):  
Repeated Measures ◽  
Fixed Effects ◽  
Average Daily Gain ◽  
Covariance Structure ◽  
Treatment Phase ◽  
Positive Control ◽  
Negative Control ◽  
Feed Ratio ◽  
Experimental Unit ◽  
Nursery Pigs

Abstract Four hundred and eighty (PIC 337 X 1050, PIC Genus, Hendersonville, TN) pigs were used to evaluate a novel threonine source (ThrPro, CJ America Bio, Fort Dodge, IA) for nursery pigs from approximately 7 to 20 kg body weight (BW). After weaning, pigs were sorted by sex and fed a common diet for 1 wk. Upon completion of the first week, pigs were sorted into randomized complete blocks, equalized by weight, within 16 replications. Pigs were allocated to one of three dietary treatments: positive control (POS)—standard ileal digestible threonine-to-lysine ratio (SID; Thr:Lys) 0.60, negative control (NEG)—SID Thr:Lys ≤0.46, and alternative Thr source (TEST)—SID Thr:Lys 0.60. The alternative Thr source included fermentative biomass and was assumed to contain 75% Thr and a digestibility coefficient of 100% based on the manufacturer’s specifications. All other nutrients met or exceeded the NRC recommendations. Growth and intake data were analyzed as repeated measures with a compound symmetry covariance structure using the MIXED procedure in SAS 9.4 (SAS Institute Inc., Cary, NC) with pen as the experimental unit. Treatment, phase, the interaction between treatment and phase, and block were included as fixed effects in the model. Differences in total removals were tested using Fisher’s Exact Test of PROC FREQ. Results were considered significant at P ≤ 0.05 and considered a trend at P &gt; 0.05 and P ≤ 0.10. During the first 14 d, pigs fed TEST had decreased gain-to-feed ratio (G:F; 0.77 vs. 0.80, P = 0.022) compared to POS and increased G:F (0.77 vs. 0.73, P &lt; 0.001) compared to NEG. Over days 14–28, pigs fed TEST had similar G:F (0.71 vs. 0.70, P = 0.112) compared to POS and increased G:F (0.71 vs. 0.63, P &lt; 0.001) compared to NEG. Overall (days 0–28), pigs fed TEST had similar average daily gain (ADG; 0.47 vs. 0.47 kg/d, P = 0.982) and G:F (0.76 vs. 0.74, P = 0.395) compared to POS and increased ADG (0.47 vs. 0.43 kg/d, P &lt; 0.001) and G:F (0.76 vs. 0.67, P &lt; 0.001) compared to NEG. The average daily feed intake was not significantly different across treatments for the entirety of the study. In conclusion, the replacement of crystalline L-Thr with a novel Thr source resulted in similar growth performance in nursery pigs from approximately 7 to 20 kg.

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