Engormix/Pig Industry/Technical articles

Dietary selenized yeast increases the selenium content whereas organic iron (sqm) has no effect on the iron content of pork

Published on: 7/7/2017
Author/s : S.D. Jayasooriya 1,2; J.R. Pluske 2; M.L. Cox 1; D.J. Cadogan 3; E.N. Ponnampalam 1; G.H. McIntosh 4 and F.R. Dunshea 1,2,5. / Co-operative Research Centre for an Internationally Competitive Pork Industry, Willaston SA 5118. 1 Department of Primary Industries, Werribee Vic.; 2 School of Veterinary and Biomedical Sciences, Murdoch University, Murdoch WA; 3 Feedworks Pty Ltd, Romsey Vic; 4 Flinders University of South Australia, Bedford Park SA; 5 The University of Melbourne, Parkville Vic.
The human health benefits of dietary selenium (Se) and iron (Fe) are well established (Rayman, 1997; Kristensen et al., 2005).  Meat and meat products are primary sources of dietary Se and iron for humans. Pork from Se and Fe supplemented pigs may provide an additional source of these nutrients. However, the effects of supplementation of Se and iron on their status in muscles and effects on pork quality are not clearly defined. This study examined the effects of dietary Se and Fe supplementation on the Se and Fe status and meat quality of pork.
 
Crossbred finisher pigs (n=18 boars and 18 gilts), were offered ad libitum access to one of six experimental diets: 1) Basal: 0.13 mg/kg sodium selenite + 50 mg/kg iron (II) sulphate; 2) 3 mg/kg Diamond V Se (Diamond V Mills Inc); 3) 9 mg/kg Diamond V Se; 4) 100 mg/kg SQM Fe (Quali Tech®); 5) 1000 mg/kg SQM Fe and 6) 3 mg/kg Diamond V Se + 100 mg/kg SQM Fe, and were slaughtered after 28 days. Longissimus dorsi (LM) and Biceps femoris (BF) muscles were analyzed for Se and Fe levels. Pork quality measures were taken 24 hours post-slaughter in LM muscles. Instrumental colour (L*, a* and b*) and Warner-Bratzler shear force were measured up to five days of aging. Data were pooled across sexes and analyzed using analysis of variance.
 
Dietary Se supplementation significantly (P<0.0001) increased the Se concentration of pork in a linear manner (Table 1). Conversely, the Fe supplements had no effect on the Fe content in both LM (P=0.88) and BF (P=0.14). The Fe content of LM and BF muscles were higher (P<0.0004 and P<0.056 respectively) in gilts than boars. Neither Se nor Fe supplements had an effect on pig performance, carcass traits or meat quality parameters (P>0.05).  The results indicate the potential for healthful fortification of pork with organic Se, whereas no beneficial effects of feeding higher levels of organic Fe were identified. Higher Fe levels observed in gilts over the boars warrant further investigation.
 
Dietary selenized yeast increases the selenium content whereas organic iron (sqm) has no effect on the iron content of pork - Image 1
 
References
KRISTENSEN, M. B., HELS, O., MORBERG, C., MARVING, J., BUGEL, S. and TETENS, I. (2005). British Journal of Nutrition 94:78-83. RAYMAN, M. P. (1997). British Medical Journal 31:387-388.
 
 
Presented at Manipulating Pig Production XI.
 
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