Document Detail

Effects of dietary iron supplementation on growth performance, hematological status, and whole-body mineral concentrations of nursery pigs.
MedLine Citation:
PMID:  15542465     Owner:  NLM     Status:  MEDLINE    
An experiment was conducted to evaluate the effects of supplementing increasing concentrations of Fe to the diet of nursery pigs on growth performance and indices of hematological and mineral status. Pigs (n = 225; 6.5 kg; 19 +/- 3 d) were allotted randomly by BW, litter, and gender to one of five dietary treatments (five pigs per pen; nine pens per treatment). Basal diets for each phase (Phase 1: d 0 to 7; Phase 2: d 7 to 21; Phase 3: d 21 to 35) were formulated to contain minimal Fe concentration and then supplemented with 0, 25, 50, 100, and 150 mg Fe/kg of diet (as-fed basis) from ferrous sulfate. Three pigs per pen (n = 135) were chosen and bled throughout (d 0, 7, 21, and 35) to determine hemoglobin (Hb), hematocrit (Hct), transferrin (Tf), and plasma Fe (PFe). In addition, pigs (n = 5; 5.9 kg; 19 +/- 3 d) from the contemporary group were killed at d 0 to establish baseline (BL), and 30 pigs (six pigs/treatment) were killed at d 35 to determine whole-body and liver mineral concentrations. The improvements in growth performance during Phase 2 (ADG = linear, P = 0.04; ADFI = linear, P = 0.10; G:F = quadratic, P = 0.07) were of sufficient magnitude that dietary treatments tended to increase ADG (linear, P = 0.08), ADFI (quadratic, P = 0.09), and G:F (quadratic, P = 0.10) for the 35-d experiment. Hematological variables were not affected until d 21, at which time dietary Fe supplementation resulted in a linear increase (P = 0.03) in Hb, Hct, and PFe. This linear increase (P = 0.001) was maintained until d 35 of the experiment; however, dietary treatments resulted in a linear decrease (P = 0.01) in Tf on d 35. Whole-body Fe concentration increased (linear, P = 0.01) in pigs due to increasing dietary Fe concentrations. Moreover, pigs fed for 35 d had greater (P = 0.02) whole-body Fe, Zn, Mg, Mn, Ca, and P concentrations and lower (P = 0.001) whole-body Cu concentration than BL. Hepatic Fe concentration increased (linear, P = 0.001) in pigs due to dietary treatments; however, the hepatic Fe concentration of all pigs killed on d 35 was lower (P = 0.001) than the BL. Results suggest that Fe contributed by feed ingredients was not sufficient to maintain indices of Fe status. The decrease in Fe stores of the pigs was not severe enough to reduce growth performance. Even so, the lessening of a pig's Fe stores during this rapid growth period may result in the occurrence of anemia during the subsequent grower and finisher periods.
M J Rincker; G M Hill; J E Link; J E Rowntree
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  82     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-11-15     Completed Date:  2006-07-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3189-97     Citation Subset:  IM    
Department of Animal Science, Michigan State University, East Lansing 48824, USA.
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MeSH Terms
Animal Feed
Body Composition / drug effects*
Dietary Supplements*
Dose-Response Relationship, Drug
Iron / analysis
Iron, Dietary / administration & dosage,  pharmacology*
Liver / chemistry
Swine / blood*,  growth & development*,  metabolism
Reg. No./Substance:
0/Iron, Dietary; 7439-89-6/Iron

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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