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

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.

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

Journal of Animal Science ◽

10.1093/jas/skz122.345 ◽

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.

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PSV-12 Effects of increasing iron dosage in newborn pigs on preweaning performance and hematological criteria

Journal of Animal Science ◽

10.1093/jas/skz122.344 ◽

2019 ◽

Vol 97 (Supplement_2) ◽

pp. 195-196

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 ◽

Newborn Pigs ◽

Pig Performance

Abstract Newborn pigs (n = 336; 1.7 kg BW) were used in a 21-d study evaluating the effects of increasing injectable Fe on preweaning pig performance and blood Fe status. A total of 28 litters were used and at processing (d 3 after farrowing) all piglets were weighed and six barrows and six gilts/litter were allotted to 1 of 6 treatments in a CRD. Treatments consisted of a negative control receiving no Fe injection and increasing injectable Fe (Gleptoforte, Ceva Animal Health, Lenexa, KS) to achieve 50, 100, 150, 200-mg, or 200-mg plus a 100-mg injection on d 11 post-farrowing. Piglets were weighed and bled on d 3, 11, and 21 of age to determine growth performance and blood Fe status. Preweaned pig growth data and hematological criteria were evaluated using individual pig as the experimental unit with hematological criteria analyzed as a repeated measure. Increasing injectable Fe up to 100-mg improved (quadratic; P < 0.05) ADG and d 21 BW with no further improvement thereafter (Table 1).There were no evidence of differences (P > 0.10) between the 200-mg and 200 + 100-mg treatments for growth. Significant treatment×day interactions (P < 0.001) were observed for hemoglobin (Hgb) and hematocrit (Hct). The interactions were the result of decreased values for pigs receiving no Fe injection or an Fe injection of 100-mg or less, while pigs receiving an Fe injection greater than 100-mg had increased values at d 21. Pigs receiving the 200 + 100-mg treatment had increased (P < 0.05) Hgb and Hct values compared to pigs receiving a single 200-mg Fe injection on d 21. Results suggest that a 100-mg Fe injection is sufficient for growth performance during the preweaning phase, but an Fe injection greater than 100-mg is needed to maximize blood criteria. An extra 100-mg Fe injection at d 11 did not influence growth performance but does increase Hgb and Hct at weaning.

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258 Effects of iron administration timing on subsequent nursery performance

Journal of Animal Science ◽

10.1093/jas/skaa054.153 ◽

2020 ◽

Vol 98 (Supplement_3) ◽

pp. 86-87

Author(s):

Hayden E Williams ◽

Ryan T Maurer ◽

Brittany Carrender ◽

Joel M DeRouchey ◽

Jason C Woodworth ◽

...

Keyword(s):

Growth Performance ◽

Animal Health ◽

Random Effect ◽

Negative Control ◽

Experimental Unit ◽

Injection Timing ◽

Growth Data ◽

Iron Administration ◽

Randomized Design ◽

D 12

Abstract Weaned pigs (n=1,722; 5.9 kg BW) were used in a 53-d study evaluating the effects of Fe injection timing on subsequent nursery pig performance. Treatments consisted of a negative control for piglets receiving no Fe injection or 200-mg of injectable Fe (GleptoForte, Ceva Animal Health, Lenexa, KS) provided on d 1, 3, 5, or 7 of age, or 200-mg on d 1 plus an additional 200-mg injection on d 12. At weaning, pigs were placed in a commercial wean-to-finish facility in a total of 15 pens with equal representation of treatments in each pen. Pigs were weighed on d 73 after birth to determine subsequent nursery growth performance. Growth data were analyzed (GLIMMIX procedure of SAS) as a completely randomized design with individual pig as the experimental unit and pen as a random effect. Increasing the age that piglets received a 200-mg Fe injection showed no evidence of difference (P >0.10) for subsequent nursery ADG (Table 1). Not providing an Fe injection after birth decreased (P=0.0001) subsequent nursery ADG and decreased (P=0.0001) d 73 BW compared to all other treatments. Providing a 200-mg injection of Fe on d 1 plus a 200-mg injection on d 12 decreased (P=0.010) subsequent nursery ADG and decreased (P=0.024) d 73 BW compared to pigs receiving a 200-mg injection on d 1 only. There was no evidence of difference (P >0.10) for nursery mortality amongst the treatments. These results suggest that providing a 200-mg Fe injection within 7 d after farrowing is sufficient for optimizing subsequent nursery growth performance. The additional 200-mg Fe injection at d 12 decreased subsequent nursery growth performance and ending BW.

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Effects of increasing Fe dosage in newborn pigs on suckling and subsequent nursery performance and hematological and immunological criteria

Journal of Animal Science ◽

10.1093/jas/skaa221 ◽

2020 ◽

Vol 98 (8) ◽

Author(s):

Hayden E Williams ◽

Joel M DeRouchey ◽

Jason C Woodworth ◽

Steven S Dritz ◽

Michael D Tokach ◽

...

Keyword(s):

Growth Performance ◽

Animal Health ◽

Average Daily Gain ◽

Negative Control ◽

Significant Treatment ◽

Randomized Design ◽

Nursery Pig ◽

Newborn Pigs ◽

Completely Randomized Design ◽

Pig Performance

Abstract A total of 336 newborn pigs (DNA 241 × 600, initially 1.75 ± 0.05 kg bodyweight [BW]) from 28 litters were used in a 63-d study evaluating the effects of increasing injectable Fe dose on suckling and subsequent nursery pig performance and blood Fe status. GleptoForte (Ceva Animal Health, LLC, Lenexa, KS) contains gleptoferron which is an Fe macromolecule complex that is commercially used as an injectable Fe source for suckling piglets. On the day of processing (day 3 after birth), all piglets were weighed and 6 barrows and 6 gilts per litter were allotted within sex to 1 of 6 treatments in a completely randomized design. Treatments consisted of a negative control receiving no Fe injection and increasing injectable Fe to achieve either 50, 100, 150, 200 mg, or 200 mg plus a 100 mg injection on day 11 after birth. Pigs were weaned (~21 d of age) and allotted to nursery pens based on BW and corresponding treatment in a completely randomized design. During lactation, increasing injectable Fe up to 100 mg improved (quadratic; P < 0.05) average daily gain (ADG) and day 21 BW with no further improvement thereafter. There was no evidence of differences (P > 0.10) observed between the 200 mg and 200 mg + 100 mg treatments for growth. For the nursery period, increasing Fe dosage increased (linear; P < 0.05) ADG, average daily feed intake, and day 42 BW. There was no evidence of differences (P > 0.10) between the 200 mg and 200 mg + 100 mg treatments for nursery growth. For blood criteria, significant treatment × day interactions (P = 0.001) were observed for hemoglobin (Hb) and hematocrit (Hct). The interactions occurred because pigs that had <150 mg of injectable Fe had decreased values to day 21 and then increased to day 63 while pigs with 150 or 200 mg of injectable Fe had increased values to day 21 then stayed relatively constant to day 63. In summary, piglet performance during lactation was maximized at 100 mg while nursery growth performance and blood Fe status were maximized with a 200 mg Fe injection at processing. Providing an additional 100 mg of Fe on day 11 of age increased Hb, and Hct values at weaning and 14 d into the nursery but did not provide a growth performance benefit in lactation or nursery. These results indicate that providing 200 mg of injectable Fe provided from GleptoForte is sufficient to optimize lactation and subsequent nursery growth performance and blood Fe status.

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

Journal of Animal Science ◽

10.1093/jas/skz122.077 ◽

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.

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363 Evaluating the effects of day of iron injection after farrowing on preweaning performance and hematological criteria

Journal of Animal Science ◽

10.1093/jas/skz122.268 ◽

2019 ◽

Vol 97 (Supplement_2) ◽

pp. 151-152

Author(s):

Cierra Roubicek ◽

Hayden E Williams ◽

Joel M DeRouchey ◽

Jason C Woodworth ◽

Steve S Dritz ◽

...

Keyword(s):

Growth Performance ◽

Animal Health ◽

Negative Control ◽

Injection Timing ◽

Significant Treatment ◽

Newborn Pigs ◽

Pig Performance ◽

D 12

Abstract Newborn pigs (n = 324; 1.6 kg BW) were used in an 19-d study evaluating the effects of Fe injection timing after birth on preweaned pig performance and blood criteria. A total of 27 litters were used, with the number of pigs per sow equalized on each day of farrowing. Two d after farrowing, all piglets were weighed, and six barrows and six gilts within each litter were allotted to 1 of 6 treatments in a CRD. Treatments consisted of a negative control receiving no Fe injection or 200 mg of injectable Fe (Gleptoforte, Ceva Animal Health, Lenexa, KS) provided on d 2, 4, 6, 8, or 10 after farrowing. Piglets were weighed and bled on d 2, 12, and 21 after birth to determine growth performance and blood Fe status. Overall, increasing the age that piglets received a 200 mg Fe injection until 4 or 6 d after birth tended to increase (quadratic; P = 0.065) ADG (Table 1). Not providing an Fe injection tended to decrease (P = 0.070) overall ADG and decreased (P = 0.0003) d 21 BW compared to all other treatments. Significant treatment×day interactions (P < 0.001) were observed for hemoglobin (Hgb) and hematocrit (Hct). The interactions occurred because pigs injected with 200 mg of Fe on d 2, 4, 6, or 8 after birth had increasing values until d 21 after birth, while pigs receiving a 200 mg Fe injection on d 10 after birth had decreasing values to d 12 then increasing values to d 21. Pigs not provided an Fe injection after birth had decreasing values to d 21. These results suggest that providing a 200 mg Fe injection on d 4 or 6 after farrowing provided the greatest preweaning growth performance and blood Fe status until weaning.

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PSIX-11 Effects of Spray-Dried Lactococcus-Based Fermentation Products on Growth Performance of Nursery Pigs

Journal of Animal Science ◽

10.1093/jas/skaa054.333 ◽

2020 ◽

Vol 98 (Supplement_3) ◽

pp. 188-189

Author(s):

Kara M Dunmire ◽

Michaela B Braun ◽

Gage E Nichols ◽

Caitlin E Evans ◽

Marut Saensukjaroenphon ◽

...

Keyword(s):

Treatment Effect ◽

Control Diet ◽

Phase 1 ◽

Negative Control ◽

Experimental Unit ◽

Fermentation Products ◽

Fermentation Product ◽

Nursery Pig ◽

Pig Performance ◽

Spray Dried

Abstract A total of 720 barrows (initially 5.9 kg; Line 200 × 400; DNA, Columbus, NE) were used in a 42-d growth trial to test the effects of spray-dried Lactococcus-based fermentation products on nursery pig performance. There were 24 replications per treatment with pen randomly allotted to 1 of 6 dietary treatments. The positive control (PC) diet included zinc oxide (ZnO; phase 1), ZnO + chlortetracycline (CTC; phase 2) while the negative control (NC) diet did not include ZnO or CTC. Treatment diets included the negative control + 1 of 4 fermentation products (C, D, E, or F) added at 5% of the diet. Phase 3 diets contained a common control diet fed to all pigs plus treatment diets with fermentation products. Data were analyzed with pen as the experimental unit and barn within group as the blocking factor using PROC-GLIMMIX in SAS. From d 0 to 20, there was an overall treatment effect (P = 0.001) where pigs fed PC had increased (P < 0.05) d 20 BW, ADG, ADFI, and improved G:F compared to those fed the NC and NC + fermentation product. Overall, there was a treatment effect (P = 0.03) for pigs fed the PC having improved (P < 0.05) ADG and G:F compared to the NC and NC + fermentation product. In addition, pigs fed the NC had improved (P < 0.05) G:F compared to those fed additive D, E, and F. In conclusion, pigs fed the PC (zinc + CTC) diet had improved performance compared to pigs fed the NC with or without fermentation product. Adding fermentation products to the NC diet did not improve nursery pig performance.

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PSII-9 Effect of avilamycin on nursery pig performance and health

Journal of Animal Science ◽

10.1093/jas/skz122.413 ◽

2019 ◽

Vol 97 (Supplement_2) ◽

pp. 234-235

Author(s):

Robyn Thompson ◽

Laura Greiner ◽

Amanda Graham ◽

Brandon Knopf

Keyword(s):

Body Weight ◽

Porcine Circovirus ◽

Control Treatment ◽

Experimental Unit ◽

Final Body Weight ◽

Feeding Duration ◽

Randomized Design ◽

Nursery Pig ◽

Pig Performance ◽

The Impact

Abstract Four hundred (PIC 337 X Camborough, PIC, Hendersonville, TN) and 800 (PIC 359 X C29) barrows and gilts were used to determine the impact of avilamycin (Kavault®, Elanco, Greenfield, IN) on nursery pig performance. Upon weaning, the lightest 10% of pigs were sorted off to form one replication and the remaining pigs were sorted by sex and placed into blocks with 25 pigs/pen. Six of the 48 pens were assigned to a non-feed grade medication control treatment. Remaining blocks were assigned to 1 of 3 treatments (50 g Mecadox/ton, 73 g Kavault/ton d0 to d21, 73 g Kavault/ton d0 to d42). Diets were formulated to meet or exceed NRC (2012) recommendations. Pen weights and feed intake information were collected for calculation of ADG, ADFI, and F:G. Pigs were vaccinated against porcine circovirus, Mycoplasma hyopnuemoniae, Salmonella, and Lawsonia. Diagnostic samples showed presence of E. coli and Salmonella. Pigs were PRRSv and PEDv negative. Data were analyzed as a completely randomized design using the PROC MIXED procedure of SAS with pen as experimental unit and treatment as a fixed effect. LSMeans were considered significant at P ≤ 0.05 and considered a trend at P > 0.05 and P ≤ 0.10. Final body weight (d42) was not significantly different (P = 0.26), but there were numerical improvements in body weight for all medication treatments compared to the control (0.68, 0.68, and 1.5 kg for Mecadox, Kavault 21 d and Kavault 42 d respectively). Overall ADG (0.46, 0.45, 0.48, 0.45 kg, respectively) was greatest and F:G was lowest for the Kavault 42d treatment, although differences were not always significant (P > 0.05). Feeding medications numerically lowered the percentage of injectable medication intervention compared to controls (110.8, 12.7, 137.2, and 156.0%, respectively). Avilamycin appears to be an effective medication option for pigs in 42 d nursery programs but the anticipated response may differ depending on feeding duration.

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177 Effect of supplementing a fatty acid-based product, Monomix, or pharmacological levels of zinc oxide on growth performance of nursery pigs

Journal of Animal Science ◽

10.1093/jas/skaa054.149 ◽

2020 ◽

Vol 98 (Supplement_3) ◽

pp. 84-85

Author(s):

Kelsey L Batson ◽

Lori Thomas ◽

Jason C Woodworth ◽

Mike D Tokach ◽

Robert D Goodband ◽

...

Keyword(s):

Fatty Acid ◽

Experimental Unit ◽

Acid Product ◽

Nursery Pigs ◽

Medium Chain ◽

Randomized Design ◽

Quality Technology ◽

Nursery Pig ◽

Fatty Acid Product ◽

Pig Performance

Abstract Trials suggest short and medium chain fatty acids can be used as alternatives for ZnO; however, US studies are limited. Therefore, the objective of this study was to evaluate the effects of a short and medium chain fatty acid product (Monomix, Quality Technology International, Inc., Elgin, IL) added alone or in combination with pharmacological levels of ZnO on nursery pig performance. A total of 354 pigs (DNA 200×400, initial BW=5.9 kg) were randomized to pens (5 pigs/pen) and pens were allotted to 1 of 4 treatments with 18 replicates/treatment. Treatments were arranged in a 2×2 factorial with main effects of added ZnO (0 vs. 3,000/2,000/0 ppm of Zn in phases 1, 2, and 3 respectively) and Monomix (0 vs. 0.4% in phases 1, 2, and 3). Treatment diets were formulated in three phases fed from d 0 to 7, 7 to 18, and 18 to 35 post-weaning with all diets containing 110 ppm Zn from the trace mineral premix. Data were analyzed as completely randomized design using the PROC GLIMMIX procedure of SAS with pen as the experimental unit. No ZnO × Monomix interactions (P=0.399) were observed. Feeding Monomix decreased ADFI (P=0.002) and ADG (P=0.012) from d 0 to 7, resulting in decreased d 7 BW (P=0.015) but there was no evidence for other differences. Feeding ZnO from d 0 to 7 and 7 to 18,increased ADG (P< 0.001), ADFI, and BW, and improved G:F. Overall from d 0 to 35, pigs fed diets with added ZnO in phases 1 and 2 had increased (P< 0.05) ADG, ADFI, and d 35 BW, with no evidence for differences in performance in pigs fed diets with Monomix. The addition of Monomix failed to improve pig performance, whereas pharmacological levels of ZnO improved ADG and ADFI.

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260 Effects of iron administration timing on pre-weaning performance and hematological criteria in pigs

Journal of Animal Science ◽

10.1093/jas/skaa054.155 ◽

2020 ◽

Vol 98 (Supplement_3) ◽

pp. 88-89

Author(s):

Hayden E Williams ◽

Ryan T Maurer ◽

Brittany Carrender ◽

Joel M DeRouchey ◽

Jason C Woodworth ◽

...

Keyword(s):

Growth Performance ◽

Animal Health ◽

Injection Timing ◽

Iron Administration ◽

Newborn Pigs ◽

Pig Performance ◽

D 20 ◽

D 12 ◽

Administration Timing

Abstract Newborn pigs (n=1,892; 1.5 kg BW) were used in a 20-d study evaluating the effects of Fe injection timing after birth on preweaned pig performance and blood criteria. A total of 172 litters were used. One d after farrowing, piglets were weighed, and 11 pigs within each litter were allotted to 1 of 6 treatments in a CRD. Treatments consisted of pigs receiving no Fe injection or 200-mg of injectable Fe (GleptoForte, Ceva Animal Health, Lenexa, KS) provided on d 1, 3, 5, or 7 of age, or 200-mg on d 1 plus 200-mg on d 12. 1 pig/litter received no Fe injection and 2 pigs/litter were placed on all other treatments. Piglets were weighed on d 1 and 20 after birth to determine growth performance and bled on d 20 to determine Fe status. Increasing the age that piglets received the Fe injection tended to decrease (linear; P=0.080) ADG. Not providing an Fe injection decreased (P=0.0001) overall ADG and d 20 BW compared to all other treatments. Hemoglobin and Hct decreased (linear; P< 0.05) with increasing age when pigs received an Fe injection. There was no evidence of differences (P >0.10) between the pigs receiving a 200-mg injection on d 1 and d 12 compared to those receiving the Fe on d 1 only. Pigs not provided an Fe injection had decreased (P=0.0001) Hb and Hct values compared to pigs receiving an Fe injection. Pigs receiving the 200-mg injection on d 1 and 12 had increased (P=0.0001) Hb and Hct values compared to pigs receiving 200-mg on d 1 only. Results suggest that providing a 200-mg Fe injection within 7 d after farrowing is sufficient for optimizing preweaning growth performance. The additional 200-mg Fe injection at d 12 did not influence growth performance but does increase Hb and Hct at weaning.

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