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. 2012 Mar 1;3(1):9. doi: 10.1186/2049-1891-3-9

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Copyright ©2012 Li et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fitted straight broken-line of weight gain as a function of SID-Lys:ME ratio (Exp. 6). Observed block mean values in each treatment (dot represent block 1, square represent block 2, triangle represent block 3, × represent block 4, plus represent block 5, DIAMOND represent block 6) are shown. Two observations (× in treatment two and DIAMOND in treatment five) were considered outliers because they were influential points in the model. The straight broken line: y = 0.8587 - 0.209 × (2.2 - x) + LVAR (r² = 0.74, adjusted r² = 0.59). Parameter LVAR represents the block effect and produces different lines for the respective blocks. The optimum SID Lys:ME ratio was 2.2 in 84 to 109 kg pig.