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INVESTIGATIONS INTO HYPERLIPIDEMIA AND ITS POSSIBLE ...

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131<br />

Dogs that did not respond to the diet change tended to have lower LDL fractions (mainly<br />

LDL 1 and LDL 2 ) and higher HDL fractions (mainly HDL 2a , HDL 3b , and HDL 3c ) than the<br />

ones that responded.<br />

The most important changes in lipoprotein fractions in response to diet change as<br />

determined by SIR were decreases in TRL and LDL 1 and increases in LDL 4 and HDL 3c .<br />

Figures 21A and 21B show the lipoprotein density profiles from a representative dog in<br />

Group 1 before and after the diet change.<br />

Discussion<br />

To our knowledge, this is the first study evaluating the effect of a commercially<br />

available low-fat diet on serum lipid concentrations and lipoprotein profiles in Miniature<br />

Schnauzers with hyperlipidemia. The results of this study suggest that the study diet<br />

significantly reduced serum triglyceride and cholesterol concentrations in<br />

hyperlipidemic Miniature Schnauzers within 2 months. In addition, the lipoprotein<br />

profiles of the hyperlipidemic Miniature Schnauzers changed significantly 2 months<br />

after the initiation of the study diet, and the majority of dogs could be classified as<br />

normal based on their lipoprotein profile analysis at that point. Lipoprotein fractions<br />

mainly affected by the diet change were the TRLs and LDL 1 (which both decreased in<br />

response to feeding the low-fat diet) and LDL 4 and HDL 3c (which both increased in<br />

response to feeding the low-fat diet).

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