Journal of Animal Science and Technology

Korean Society of Animal Sciences and Technology (한국축산학회)
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Effects of Tannic Acid Added to Diets Containing Low Level of Iron on Performance, Blood Hematology, Iron Status and Fecal Microflora in Weanling Pigs

  • Lee, Seung-Hyung (College of Animal Life Sciences, Kangwon National University) ;
  • Shinde, Prashant (College of Animal Life Sciences, Kangwon National University) ;
  • Choi, Jae-Yong (College of Animal Life Sciences, Kangwon National University) ;
  • Kwon, Ill-Kyong (College of Animal Life Sciences, Kangwon National University) ;
  • Lee, Jeong-Koo (College of Animal Life Sciences, Kangwon National University) ;
  • Pak, Son-Il (School of Veterinary Medicine, Kangwon National University) ;
  • Cho, Won-Tak (Genebiotech Co. Ltd.) ;
  • Chae, Byung-Jo (College of Animal Life Sciences, Kangwon National University)
  • Received : 2009.09.07
  • Accepted : 2009.12.21
  • Published : 2009.12.01
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Abstract

This study investigated the effects of tannic acid (TA) in the diets for weanling pigs prepared with/without supplemental Fe on performance, hematology, fecal microflora and diarrhea incidence. Limestone and calcium phosphate used in Experiment 1 and 2 were of semi-synthetic and feed-grade quality, respectively; while the trace-mineral premix used in both the experiments was prepared without any added Fe source. In Experiment 1, 108 weaned pigs (Landrace ${\times}$ Yorkshire ${\times}$ Duroc, initially 6.46 ${\pm}$ 1.04 kg BW) were allotted to 3 treatments including control (diet added with $FeSO_4$ and antibiotic), T1 (diet devoid of $FeSO_4$ and antibiotic) and T2 (T1 diet added with 125 mg/kg TA). Each treatment had 4 replicates with 9 pigs in each pen. Feeding of T1 diet had a negative effect on the performance and plasma Fe status of pigs, while addition of TA to T1 diet resulted in performance of pigs comparable to pigs fed the control diet, reduced diarrhea incidence but had a negative influence on the hematological and plasma Fe indices. Additionally, pigs fed T2 diet had fewer (p<0.05) total anaerobic bacteria, Clostridium spp. and coliforms than pigs fed T1 diet, and greater number of Bifidobacterium spp. and Lactobacillus spp. in feces when compared with pigs fed control and T1 diets. In Experiment 2, 144 weaned pigs (Landrace ${\times}$ Yorkshire ${\times}$ Duroc, initially 6.00 ${\pm}$ 1.07 kg BW) were allotted to 4 dietary treatments including control (diet added with $FeSO_4$ and antibiotic) and diets devoid of supplemental Fe added with antibiotic (An), TA and both (AnTA). Each treatment had 4 replicates with 9 pigs in each pen. Addition of An, TA or both to diets devoid of supplemental Fe did not have any effect on performance, blood hematology and plasma Fe but resulted in reduced (p<0.05) diarrhea incidence and lower (p<0.05) fecal coliform population than pigs fed the control diet. These results suggest that TA has a negative influence on blood hematology and plasma Fe status when diets are inadequate in Fe; however, TA reduced diarrhea incidence and might have antimicrobial activity.

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References

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