scholarly journals Effect of narasin (Skycis) or zinc bacitracin (Albac) inclusion on the growth performance and carcass characteristics of finishing pigs sent for slaughter using a 3-phase marketing strategy

2017 ◽  
Vol 1 (4) ◽  
pp. 518-525
Author(s):  
J. W. Rickard ◽  
G. L. Allee ◽  
P. J. Rincker ◽  
S. L. Gruber ◽  
C. L. Puls ◽  
...  
Keyword(s):  
Marketing Strategy ◽  
Growth Performance ◽  
Block Design ◽  
Carcass Characteristics ◽  
Dietary Treatment ◽  
The Other ◽  
Finishing Pigs ◽  
Carcass Yield ◽  
Zinc Bacitracin ◽  
Dietary Treatments

Abstract The objective of this study was to evaluate the effect of dietary inclusion of narasin or zinc bacitracin on the growth performance and carcass characteristics of finishing pigs sent for slaughter using a 3-phase marketing strategy. The study used 2,219 crossbred pigs in a randomized complete block design (blocking factor = start date) with 3 dietary treatments: 1) Control (no feed additive), 2) 15 mg/kg narasin (Skycis, Elanco Animal Health, Greenfield, IN), and 3) 28 mg/kg zinc bacitracin (Albac, Zoetis, Parsippany, NJ). Pigs were housed in single-sex pens of 25 pigs in a commercial wean-to-finish facility and there were 30 pen-replicates of each dietary treatment. All pigs were weighed as a group (i.e., pen) on d 0 (start of experimental feeding period), 77, 91, and 105 (end) of study. Pigs had ad libitum access to feed and water throughout the study period; all feed additions to the feeder were recorded. Pigs were sent for slaughter according to the following marketing strategy: 1) after 77 d on study, the heaviest 20% of each pen was sent for slaughter (Phase 1), 2) after 91 d on study, the next heaviest 48% of each pen were sent for slaughter (Phase 2), and 3) after 105 d on study, the remaining 32% of each pen was sent for slaughter (Phase 3). Pigs within each pen were selected for slaughter by visual appraisal of weight and shipped to a commercial slaughter facility where standard carcass measurements (HCW, LM depth, and backfat depth) were measured. Feeding narasin increased (P < 0.05) final live BW (1.3 kg) and overall ADG (1.1%) compared to the other treatments, which were similar (P > 0.05). Dietary treatment did not impact (P > 0.05) overall G:F. Feeding narasin increased (P < 0.05) HCW (1.4 kg) and carcass yield (0.3% units) compared to the other dietary treatments, which were similar (P > 0.05) for these traits. Overall, these results demonstrate that narasin-fed pigs had improved overall growth rate, HCW, and carcass yield compared to controls or pigs fed zinc bacitracin.

scholarly journals Effects of ractopamine hydrochloride on the growth performance and carcass characteristics of heavy-weight finishing pigs sent for slaughter using a 3-phase marketing strategy

2017 ◽  
Vol 1 (3) ◽  
pp. 406-411 ◽  
Author(s):  
J. W. Rickard ◽  
G. L. Allee ◽  
P. J. Rincker ◽  
J. P. Gooding ◽  
R. J. Acheson ◽  
...  
Keyword(s):  
Marketing Strategy ◽  
Growth Performance ◽  
Block Design ◽  
Phase 1 ◽  
Carcass Characteristics ◽  
Finishing Pigs ◽  
Carcass Yield ◽  
Heavy Weight ◽  
Subsequent Phase ◽  
Ractopamine Hydrochloride

Abstract A total of 2,158 crossbred pigs was used to evaluate the effects of feeding 7.4 mg/kg ractopamine hydrochloride (RAC) on the growth performance and carcass characteristics of heavy-weight finishing pigs sent to slaughter using a 3-phase marketing strategy. The study was performed from 121.0 ± 4.28 kg to 144.5 ± 4.73 BW using a randomized complete block design (blocking factor was d of start on test) with 2 treatments (0 vs. 7.4 mg/kg RAC). Pigs were housed in a commercial wean-to-finish facility in groups of approximately 25 (44 groups/treatment), with ad libitum access to feed and water throughout the study, and pen weights of pigs were recorded at the start (d 0), and on d 7, 21, and 35 of study. Pigs were sent for slaughter according to the following marketing strategy: 1) after 7 d on RAC, the heaviest 16% of each pen was sent for slaughter (Phase 1), 2) after 21 d on RAC, the next 40% of each pen was sent for slaughter (Phase 2), and 3) after 35 d on RAC, the remaining 44% of each pen was sent for slaughter (Phase 3). Pigs were selected for slaughter by visual appraisal and shipped to a commercial facility where standard carcass measurements (HCW, LM depth, and backfat depth) were measured. Overall, feeding RAC increased (P < 0.001) ADG (18.8%) and G:F (23.7%) compared to the control, but lowered (P < 0.001) ADFI (3.3%). In addition, feeding RAC increased (P < 0.001) HCW (3.9 kg), carcass yield (0.7% units), LM depth (5.0%), and predicted lean content (1.0% units), and reduced backfat depth (6.3% lower) compared to controls. With each subsequent phase of marketing, the magnitude of improvements in response to feeding RAC decreased for ADG (43.1, 20.9, and −3.1% for Phase 1, 2, and 3, respectively) and G:F (37.5, 25.8, and 6.4% for Phase 1, 2, and 3, respectively); however, improvements in HCW (1.6, 4.5, and 4.2 kg for Phase 1, 2, and 3, respectively), carcass yield (0.2, 0.6, and 0.9% units for Phase 1, 2, and 3, respectively), LM depth (2.3, 5.7, and 5.2% for Phase 1, 2, and 3, respectively), and predicted lean content (0.2, 1.0, and 1.3% units for Phase 1, 2, and 3, respectively) generally increased from feeding RAC. These results suggest that while improvements in growth performance from feeding RAC will generally decline after 21 d of feeding, improvements in carcass traits, particularly carcass yield and lean content, will continue with feeding RAC until d 35.

scholarly journals Effects of Substitution of Corn with Ground Brown Rice on Growth Performance, Nutrient Digestibility, and Gut Microbiota of Growing-Finishing Pigs

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 375
Author(s):  
Sheena Kim ◽  
Jin Ho Cho ◽  
Younghoon Kim ◽  
Hyeun Bum Kim ◽  
Minho Song
Keyword(s):  
Gut Microbiota ◽  
Growth Performance ◽  
Block Design ◽  
Brown Rice ◽  
Carcass Characteristics ◽  
Basal Diet ◽  
Nutrient Digestibility ◽  
Growing Pigs ◽  
Finishing Pigs ◽  
Dietary Treatments

The present study was conducted to evaluate the effects of replacing corn with brown rice on growth performance, nutrient digestibility, carcass characteristics, and gut microbiota of growing and finishing pigs. A total of 100 growing pigs (23.80 ± 2.96 kg BW; 10 weeks of age) were randomly allotted to 4 dietary treatments (5 pigs/pen; 5 replicates/treatment) in a randomized complete block design (block = BW) as follows: corn-soybean meal basal diet (CON) and replacing corn with 50% (GBR50), 75% (GBR75), and 100% (GBR100) of ground brown rice. Each trial phase was for 6 weeks. During the growing period, there were no differences on growth performance and nutrient digestibility among dietary treatments. Similarly, no differences were found on growth performance, nutrient digestibility, and carcass characteristics of pigs during the finishing period among dietary treatments. As a result of the beta diversity analysis, microbial populations were not clustered between CON and GBR100 during the growing phase, but clustered into two distinct groups of CON and GBR100 during the finishing phase. In conclusion, brown rice can be added to the diets of growing-finishing pigs by replacing corn up to 100% without negatively affecting growth performance of the pigs; additionally, this may have an effect on changes in pig intestinal microbiota if continued for a long time.

scholarly journals Effects of two feeding periods of tiamulin fed in combination with chlortetracycline for control and treatment of swine respiratory and enteric disease and subsequent growth performance of growing-finishing pigs

2018 ◽  
Vol 3 (1) ◽  
pp. 113-122
Author(s):  
Christopher L Puls ◽  
James M Hammer ◽  
Kevin Eggers ◽  
Amanda Graham ◽  
Brandon Knopf ◽  
...  
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Individual Therapy ◽  
Finishing Pigs ◽  
Enteric Disease ◽  
Subsequent Growth ◽  
Carcass Yield ◽  
Single Sex ◽  
The Difference ◽  
Dietary Treatments

Abstract The objective of this study was to evaluate the effects of two dietary feeding periods of tiamulin in combination with chlortetracycline for the control and treatment of swine respiratory and enteric disease and subsequent growth performance. The study used 1,151 commercial crossbred barrows and gilts in a randomized complete block design. Pigs were housed in single-sex groups of 25 at a floor space of 0.69 m2/pig. There were two dietary treatments: 1) nonmedicated controls and 2) 39 mg/kg tiamulin + 441 mg/kg chlortetracycline (TIACTC) fed from days 7 to 20 and again days 49 to 62. There were 23 pens per treatment group. Daily observations were made throughout the study, including the number of pigs in each pen coughing, with diarrhea, or showing signs of lameness as well as the number of pigs in each pen requiring individual therapy treatment for each symptom. Pigs were weighed as a group on days 0 (for allocation purposes), 7, 21, 49, 61, 89 (start of marketing), and at time of slaughter. Within pen, animals were selected by visual appraisal and sent for slaughter over 4 wk to a commercial slaughter facility where HCW was collected and used to calculate carcass yield. There was no difference (P > 0.05) between treatments for the incidence of morbidity or mortality. Pigs fed TIACTC tended to have less coughing observations (P = 0.10) and less diarrhea observations (P = 0.08) during the study period, and had less observations of lameness (P < 0.001) and required less treatments than nonmedicated controls (P < 0.001). For the overall study period, pigs fed TIACTC had greater (P < 0.05) total BW gain (43.3 kg greater/pen) and greater (P < 0.05) ADG and ADFI than controls. There was no effect (P > 0.05) of treatment on G:F. Overall, pigs fed TIACTC weighed 1.3 kg heavier (P < 0.05) at the start of marketing and completed the study with an overall BW advantage of 1.6 kg (P < 0.05) compared to controls. The difference between treatments for live BW increased with marketing group (1.0 kg in marketing group 1 and 3.3 kg in marketing group 4). Pigs fed TIACTC had greater (P < 0.05) HCW (1.0 kg) than controls; however, there was no difference (P > 0.05) between treatments for carcass yield. The results of this study suggest that feeding TIACTC was successful at controlling respiratory and enteric disease and, consequently, improved growth performance and carcass weight of grow-finish pigs.

scholarly journals PSIX-10 Effects of SID Lysine:Calorie NE ratio on the Growth Performance and Carcass Characteristics of DNA 600 Sired Pigs

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 181-181
Author(s):  
Brittany Carrender ◽  
Hayden E Williams ◽  
Mandy Gerhart ◽  
Kyle Coble ◽  
Joel M DeRouchey ◽  
...  
Keyword(s):  
Growth Performance ◽  
Removal Rate ◽  
Block Design ◽  
Carcass Characteristics ◽  
Experimental Unit ◽  
Carcass Quality ◽  
Carcass Yield ◽  
Randomized Complete Block Design ◽  
Dietary Treatments

Abstract A total of 2,673 mixed sex pigs (DNA 600 × PIC 1050; initially 21.4 kg BW) were used in a 117-d study to evaluate the effects of increasing SID Lysine:Calorie NE ratio on the growth performance and carcass characteristics of DNA sired pigs. Pens of pigs (30 pigs/pen) were blocked by BW and location and allotted to 1 of 4 dietary treatments with 18 pens per treatment. Treatments were 90%, 95%, 100%, or 105% of the 2016 PIC recommended SID Lysine:Calorie NE ratio for finishing gilts. Data were analyzed as a randomized complete-block design with pen as the experimental unit. Overall (d 0-117), increasing Lysine:Calorie NE tended to improve ADG (Linear; P = 0.077) and G:F (Linear; P = 0.053). Although there was an increase in ADG with increasing SID Lysine:Calorie NE, there was no evidence for a difference (P > 0.100) in final BW. The lack of BW response is most likely due to the lower (Quadratic; P < 0.008) removal rate as SID Lysine:Calorie NE increased. Carcass ADG (Linear; P < 0.064) tended to improve as SID Lysine: Calorie NE increased. An improvement in carcass G:F (Quadratic; P < 0.004) was observed as SID Lysine:Calorie NE increased to 100% PIC (2016) recommendations, with little improvement observed thereafter. No significant differences were observed in carcass yield, loin depth, back fat, or % lean. These results suggests that DNA sired pigs fed increasing SID Lysine:Calorie NE ratios tended to have improved growth performance with no impact on carcass quality.

scholarly journals PSIV-15 Determining the effects of increasing levels of xylanase in nutrient adequate diets on growth performance, carcass characteristics of growing-finishing pigs

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 176-177
Author(s):  
Hayden R Kerkaert ◽  
Joel M DeRouchey ◽  
Steve S Dritz ◽  
Robert D Goodband ◽  
Mike D Tokach ◽  
...  
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Experimental Unit ◽  
Finishing Pigs ◽  
Carcass Yield ◽  
Distillers Grains With Solubles ◽  
Treatment Data ◽  
Unit Body Weight

Abstract A total of 1,944 mixed sex growing-finishing pigs (PIC; 337×1050; initial BW of 22.5±0.53 kg) were used in a 131-d growth trial to determine the effects of increasing levels of xylanase in adequate diets on grow-finish pig growth performance and carcass characteristics. The 6 dietary treatments consisted of corn, soybean meal, and dried distillers grains with solubles with added xylanase (Belfeed B 1100 MP; Jefo Nutrition Inc., Saint-Hyacinthe, Quebec) formulated to: 0, 5, 10, 20, 40, and 75 of enzymatic activity for xylanase (IU/kg) with 27 pigs per pen and 12 replicates per treatment. Data were analyzed as a randomized complete block design using lmer function in lme4 package in R with pen considered as the experimental unit, body weight as blocking factor, and treatment as a fixed effect. From d 0 to 70, there was a tendency (quadratic, R=0.068) for average daily gain (ADG) to decrease and then increase with increasing added xylanase, but there was no evidence (R >0.10) of differences for average daily feed intake (ADFI) and feed efficiency (G/F). From d 70 to 131 and overall, there was no evidence of difference (R >0.10) observed for ADG, ADFI, and F/G. There was no evidence for difference (R >0.10) between treatments for number of pigs receiving injectable treatments or mortalities. For carcass traits, increasing xylanase increased then decreased (quadratic, R=0.010) percentage carcass yield. Also, as xylanase increased, percentage lean decreased (linear, R=0.038) and backfat marginally increased (linear, R=0.066). In conclusion, adding increasing levels of xylanase in nutrient adequate diets did not influence growth performance or mortality but did improve carcass yield when intermediate levels were fed.

scholarly journals Determining the effects of manganese source and level on growth performance and carcass characteristics of growing-finishing pigs

2021 ◽  
Author(s):  
Hayden R Kerkaert ◽  
Jason C Woodworth ◽  
Joel M DeRouchey ◽  
Steve S Dritz ◽  
Mike D Tokach ◽  
...  
Keyword(s):  
Growth Performance ◽  
Carcass Characteristics ◽  
Finishing Pigs ◽  
Carcass Yield ◽  
Complete Diet ◽  
Finishing Pig ◽  
Potential Benefits ◽  
Source Level ◽  
Dietary Treatments ◽  
Main Effects

Abstract Two experiments were conducted to determine the effects of Mn source and level on finishing pig growth performance and carcass characteristics. Dietary treatments were arranged in a 2 × 3 factorial with main effects of Mn source (MnSO4; Eurochem, Veracruz, Mexico, or Mn hydroxychloride (IBM); Micronutrients, Indianapolis, IN), and increasing added Mn (8, 16, and 32 mg/kg of complete diet). The trace mineral premix was formulated without added Mn. Copper was added to all diets at 10 and 150 mg/kg in Exp. 1 and 2, respectively. In both experiments 1,994 pigs (PIC; 337 × 1050; initially 34.5 × 0.50 and 40.0 ±0.77 kg) were used with 27 pigs per pen and 12 replicates per treatment. Diets were corn-soybean meal-distillers dried grains with solubles-based and were fed in 4 phases. In Exp. 1, there was a marginal Mn source × level interaction (quadratic, P = 0.057) for overall G:F, with a decrease then increase in pigs fed IBM, but G:F increased with increasing Mn from MnSO4. There was no evidence for Mn source differences for ADG, ADFI or BW, but pigs fed 16 mg/kg Mn, regardless of source, tended to have decreased (quadratic, P < 0.05) ADG and final BW compared to other levels. For carcass yield, there was a tendency for Mn source × level interaction (quadratic, P = 0.075) where carcass yield did not change by increasing MnSO4 but was greatest for 16 mg/kg Mn from IBM. Loin depth increased (source × level, P = 0.041) for pigs fed increasing Mn from MnSO4 but decreased when Mn was increased from IBM. Pigs fed the intermediate level of Mn tended to have the lightest HCW (quadratic, P = 0.071) and decreased loin depth (quadratic, P = 0.044). Liver Mn concentration increased (linear, P = 0.015) as added Mn increased and tended to be greater (P = 0.075) when supplied by MnSO4 compared to IBM. In Exp. 2, there was no (P > 0.10) Mn source × level interaction observed for ADG, ADFI, and G:F. Pigs fed IBM had increased (P < 0.05) final BW, ADG, and ADFI compared to pigs fed MnSO4. Pigs fed 16 mg/kg of Mn tended (P = 0.088) to have reduced ADFI when compared pigs fed 8 and 32 mg/kg of Mn. In conclusion, there appears to be little benefit in growth performance by feeding more than 8 mg/kg of added Mn. When high levels of Cu were fed in Exp. 2, pigs fed IBM had improved growth performance compared with those fed MnSO4. Further research is needed to understand the potential benefits of Mn hydroxychloride fed in conjunction with high levels of Cu on pig growth performance.

scholarly journals 173 Effects of dietary analyzed calcium to analyzed phosphorus ratio on growth performance, carcass characteristics, and bone mineralization in 26- to 127-kg pigs

2019 ◽  
Vol 97 (Supplement_2) ◽  
pp. 101-101
Author(s):  
Carine M Vier ◽  
Steve S Dritz ◽  
Mike D Tokach ◽  
Márcio A D Gonçalves ◽  
Uislei A D Orlando ◽  
...  
Keyword(s):  
Growth Performance ◽  
Bone Mineralization ◽  
Block Design ◽  
Experimental Unit ◽  
Finishing Pigs ◽  
Bone Ash ◽  
Dietary Treatments ◽  
Best Fit ◽  
Growth Trial ◽  
Ca:P Ratio

Abstract Our objective was to determine the effects of feeding different analyzed calcium to phosphorus (Ca:P) ratios on performance of growing-finishing pigs from 26 to 127-kg. A total of 1,134 barrows and gilts (PIC 359×Camborough, initial BW 26.3 ± 0.71 kg) were used in a 110-d growth trial with 27 pigs per pen and 7 pens per treatment in a randomized complete block design. The 6 dietary treatments were formulated to contain 0:75:1, 1.00:1, 1.25:1, 1.50:1, 1.75:1, and 2.00:1 analyzed Ca:P ratio. All diets were corn-soybean meal-based and were formulated to contain adequate standardized total tract digestible P (approximately 122% of NRC 2012 estimates) for the weight range in all 4 dietary phases. Treatments were achieved by increasing calcium carbonate at the expense of corn while maintaining a constant level of monocalcium phosphate. Experimental data were analyzed using generalized linear and nonlinear mixed models with pen as the experimental unit. Increasing analyzed Ca:P ratio increased (quadratic, P < 0.05) ADG, ADFI, and final BW. Feed efficiency (G:F) was relatively similar across analyzed Ca:P ratios of 0.75:1 to 1.75:1 but worsened (quadratic, P < 0.05) at the highest ratio of 2.00:1. Hot carcass weight (HCW) and carcass ADG increased (quadratic, P < 0.05) while carcass yield decreased (quadratic, P < 0.05) with increasing analyzed Ca:P ratio. Bone mineralization increased (quadratic, P < 0.05) with increasing analyzed Ca:P ratio. For ADG, ADFI, G:F, and bone ash, the quadratic polynomial model demonstrated the best fit. The maximum responses in ADG, ADFI, G:F, HCW, and bone ash were estimated at 1.38:1, 1.49:1, 1.29:1, 1.25:1, and 1.93:1 analyzed Ca:P ratio, respectively. In conclusion, for growing-finishing pigs from 26 to 127-kg fed diets adequate in STTD P, the analyzed Ca:P ratio to maximize growth performance and HCW criteria ranged from 1.25:1 to 1.49:1. A higher analyzed Ca:P ratio, estimated at 1.93:1, was required to maximize bone mineralization.

scholarly journals 78 Evaluation of the growth performance of finishing pigs (Genesus genetics) to titrated levels of dietary lysine

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 58-59
Author(s):  
Russell W Fent ◽  
Jim D Hedges ◽  
Kelly M Peper ◽  
Dennis O Liptrap
Keyword(s):  
Growth Performance ◽  
Phase 1 ◽  
Average Daily Gain ◽  
Dietary Treatment ◽  
Feed Ratio ◽  
Finishing Pigs ◽  
Phase 2 ◽  
Phase 3 ◽  
Randomized Design ◽  
Dietary Treatments

Abstract A total of 1,000 Genesus (Oakville, Manitoba, Canada) genetics pigs (51.8 kg body weight) were used to estimate the standardized ileal digestible (SID) lysine requirement by dietary phase. Pigs were penned by sex at 25 pigs per pen. Pens were allotted to one of five dietary treatments in a completely randomized design with eight replicate pens (four barrow, four gilt) per treatment. Growth performance was evaluated in four independent phases in which pens were re-allotted to dietary treatment between phases. Dietary SID Lys concentrations evaluated were 0.78, 0.88, 0.98, 1.08, and 1.18% for phase 1, 0.68, 0.77, 0.86, 0.95, and 1.04% for phase 2, 0.60, 0.67, 0.75, 0.83 and 0.90% for phase 3, and 0.53, 0.60, 0.67, 0.74, and 0.81% for phase 4. Diets were formulated to be isoenergetic within each phase. During phase 1 (52-64 kg), average daily gain (ADG) and gain to feed ratio (G:F) increased (P &lt; 0.01) quadratically with increasing SID Lys. Breakpoint analysis estimated the SID Lys requirement for ADG and G:F for phase 1 at 0.99 and 1.02%, respectively. During phase 2 (64-82 kg), ADG increased (P &lt; 0.10) quadratically as dietary SID Lys increased with a plateau observed above 0.86% SID Lys. Gain:feed increased linearly (P &lt; 0.01) with increasing SID Lys. During phase 3 (82-97 kg) cost of gain was a quadratic response (P &lt; 0.10) with the breakpoint being at 0.76% SID Lys. During phase 4 (97-131 kg), a linear response (P &lt; 0.02) in G:F was observed with increasing SID Lys but with no improvement above 0.67% SID Lys. These data indicate the SID lysine requirement for Genesus finishing pigs to be approximately 0.99% (23.0 g/d) for 52-64 kg, 0.86% (21.9 g/d) for 64-82 kg, 0.76% (20.2 g/d) for 82-97 kg, and 0.67% (21.6 g/d) 97-131 kg.

scholarly journals Effects of narasin or virginiamycin on growth performance and carcass characteristics of growing and finishing pigs

2021 ◽  
Author(s):  
Sara K Linneen ◽  
Roger A Arentson ◽  
J Jeffrey Chewning ◽  
Scott N Carr
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Animal Health ◽  
Carcass Characteristics ◽  
Experimental Unit ◽  
Finishing Pigs ◽  
Incomplete Block Design ◽  
Finishing Pig ◽  
Effect Of Treatment ◽  
Main Effects

Abstract The objective of this experiment was to determine the effects of narasin (NAR; Skycis®; Elanco Animal Health, Greenfield, IN) or virginiamycin (VIR; Stafac®; Phibro Animal Health Corporation, Teaneck, NJ) on finishing pig growth performance and carcass characteristics. Two separate experiments were conducted at the same site in 2013 and 2014. A total of 576 pigs (initial BW = 23.2 ± 0.19 kg) were housed in 24 pens with 8 pigs per pen in Exp. 1. In Exp. 2, a total of 888 pigs (initial BW = 26.2 ± 0.12 kg) were housed in 39 pens with 8 pigs per pen. Treatments consisted of a series of unmedicated corn-soybean meal diets (CON), CON + NAR (15 mg/kg), or CON + VIR (11 mg/kg) fed for 108 d (Exp. 1) or 109 d (Exp. 2). Pen was the experimental unit in both studies. Data were analyzed as a randomized complete block design with the main effects of block and treatment (Exp. 1) and as an incomplete block design with the fixed effect of treatment and the random effects of barn and barn within block (Exp. 2). In Exp.1, NAR and VIR increased (P &lt; 0.05) ADG and ADFI from d 0 to 28, and BW on d 28, 56, 76 and 97 as compared to pigs fed CON. During day 0 to 28, pigs fed NAR had a greater (P &lt; 0.05) G:F than those fed CON or VIR. Also, during d 28 to 56 pigs fed VIR had a greater (P &lt; 0.05) ADFI than pigs fed CON. Pigs fed NAR or VIR had greater (P &lt; 0.05) carcass yield than those fed CON. In Exp.2, feeding NAR increased (P &lt; 0.05) pig BW from d 54 through 96 compared to pigs fed CON or VIR. No differences (P &gt; 0.05) in ADG were detected between pigs fed VIR and CON through the first 74 d, but ADG of pigs fed VIR was similar to (P &gt; 0.05) those fed NAR from d 26 to 54. From do 0 to 109, NAR improved ADG compared to pigs fed VIR, which also had similar gain to those consuming CON (P = 0.04). Feed efficiency was similar between pigs fed NAR and VIR with pigs fed CON intermediate (P = 0.05). Pigs fed NAR had a greater (P &lt; 0.05) HCW and loin depth than those fed CON or VIR. A subtherapeutic dose of VIR showed improvements in growth performance that were similar to NAR in one experiment. Although there were differences in the magnitude of growth and carcass effects of NAR between the two studies, pigs fed NAR showed at least a tendency to have greater G:F and in some cases increased carcass weight and yield compared to pigs consuming nonmedicated feed.

137 Evaluation of Narasin Inclusion Level on the Growth Performance and Carcass Characteristics of Growing-finishing Pigs

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 69-70
Author(s):  
Christopher L Puls ◽  
Roger Arentson ◽  
Beau A Peterson ◽  
Gustavo Silva ◽  
Brandon Knopf ◽  
...  
Keyword(s):  
Growth Performance ◽  
Block Design ◽  
Carcass Characteristics ◽  
Fixed Time ◽  
Carcass Weight ◽  
Finishing Pigs ◽  
Final Body Weight ◽  
Randomized Complete Block Design ◽  
Inclusion Level ◽  
Ad Libitum

Abstract Two studies were conducted to evaluate narasin inclusion level on the growth performance and carcass characteristics of growing-finishing pigs. The studies were carried out using a randomized complete block design with three narasin levels: 0 vs. 15 vs. 20 mg/kg. Study 1 (2,232 pigs) was carried out over a fixed time of 85 days from 33.4 ± 1.7 kg to 117.0 ± 2.6 kg. Study 2 (1,125 pigs) was carried out over a fixed time of 113 days from 28.0 ± 2.2 kg to 124.4 ± 6.0 kg. All pigs were fed diets that met or exceeded nutrient recommendations of growing-finishing pigs (NRC, 2012). Pigs were offered ad libitum access to feed and water throughout the study and weighed on day 0, 28, 56, and 84. Feed additions and feed remaining in the feeder at the time of pig weighing was recorded. Due to disruptions at the slaughter facility, carcass data were not collected on Study 1. For Study 2, pigs were sent for slaughter over five weeks, with the heaviest 20% of each pen being sent for slaughter each week. At slaughter, hot carcass weight was collected. Compared to controls, feeding 15 mg/kg narasin increased (P &lt; 0.05) final body weight (1.2 kg and 1.4 kg for Study 1 and 2, respectively), increased (P &lt; 0.05) hot carcass weight (1.3 kg), and tended (P = 0.07) to improve carcass yield (0.3 percentage units). Feeding 20 mg/kg narasin increased (P &lt; 0.05) overall G:F compared to controls (1.5% and 1.9% for Study 1 and 2, respectively). There were limited differences between the 15 and 20 mg/kg narasin levels. The results of this study confirm improvements in growth performance and carcass characteristics from feeding narasin to growing-finishing pigs. The outcomes of feeding 20 mg/kg narasin were unexpected and warrant further research.

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