|Yen, Jong Tseng|
Submitted to: Journal of Animal Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/17/2004
Publication Date: 3/7/2005
Citation: Mahan, D.C., Brendemuhl, J.H., Carter, S.D., Chiba, L.I., Crenshaw, T.D., Cromwell, G.L., Dove, C.R., Harper, A.F., Hill, G.M., Hollis, G.R., Kim, S.W., Lindemann, M.D., Maxwell, C.V., Miller, P.S., Nelssen, J.L., Richert, B.T., Southern, L.L., Stahly, T.S., Stein, H.H., van Heugten, E., Yen, J.T. 2005. Comparison of dietary selenium fed to grower-finisher pigs from various regions of the United States on resulting tissue Se and loin mineral concentrations. Journal of Animal Science. 83:852-857. Interpretive Summary: Regional differences in tissue Se concentrations exist in grower-finisher pigs and are largely attributable to the indigenous Se content in the diets fed, and most probably to the grains used rather than to the sodium selenite added. Although tissue Se concentrations values might be somewhat greater after sodium selenite was added to diets, compared with earlier studies, regional differences in tissue Se concentration still exist. A high correlation of dietary Se to body tissues (loin, liver, heart, hair) existed with similar correlations for the various tissues. Dietary Se was highly correlated (r >/_ 0.83) to the tissues, but the high relationship was attributed more to the indigenous organic Se from the grain source, not from sodium selenite.
Technical Abstract: A study was conducted to evaluate the mineral content of pork tissue with particular emphasis on Se between various states (regions) having different diet (grain) indigenous Se concentrations. The study involved 19 states in the north, central, and southern regions of the United States, with committee members of NCR-42 and S-1012 (formerly S-288). A total of 62 pigs were used, with collaborators sending 100-g samples each of loin, heart, and liver, and a 3- to 4-g sample of hair (collected along the topline) from two to five market-weight pigs to a common laboratory for analysis. Diets at each station were formulated with locally purchased soybean meal and grain that was either grown or normally fed to pigs within their state. Tissues were analyzed for Se, but only the loin was analyzed for the macro- and micromineral elements. Correlation of dietary minerals to the tissue element was determined. The results demonstrated differences in tissue Se among states (P < 0.01), with high correlations of dietary Se to loin (r = 0.84; P < 0.01), heart (r = 0.84; P < 0.01), liver (r = 0.83; P < 0.01), and hair Se (r = 0.90; P < 0.01) concentrations. The correlation of hair Se to the Se concentration of loin, heart, and liver tissues was high (r > 0.90; P < 0.01). States in the westcentral region of the United States and west of the Mississippi river had higher dietary Se and tissue Se concentrations than states in the eastern section of the Corn Belt, east of the Mississippi river, and along the East Coast. Generally, states did not differ greatly in their loin macro- and micromineral concentrations. The simple correlation of dietary minerals to their corresponding loin mineral concentration was generally nonsignificant, but most macrominerals had decreasing mineral concentrations when the dietary mineral level was higher. These results indicate that regional differences in tissue Se were influenced more by the indigenous Se content of the diet (grain) fed to the pigs than from sodium selenite.