Nippon Eiyo Shokuryo Gakkaishi
Online ISSN : 1883-2849
Print ISSN : 0287-3516
Original Papers
Effects of Deficient Zinc Intake on Palatability of Lard and Fish-oil Diets in Rats
Akie SatoYoko Nakashima
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JOURNALS FREE ACCESS

2013 Volume 66 Issue 1 Pages 25-33

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Abstract

This study examined the effect of deficient zinc intake on the palatability of lard and fish-oil diets. Four-week-old male Fischer 344 rats were fed one of four diets: zinc-deficient lard diet (-ZnLD), zinc-deficient fish-oil diet (-ZnFD), zinc-adequate lard diet (+ZnLD), zinc-adequate fish-oil diet (+ZnFD). After 3 weeks, six rats in each group were dissected. The remaining -Zn rats were placed on a two-choice diet program of -ZnLD and -ZnFD, and the +Zn rats were placed on a two-choice diet program of +ZnLD and +ZnFD. After the self-selection period, all rats were dissected. Throughout the experimental period, the -Zn groups showed significantly low plasma zinc concentrations, food intake, and body weight, compared to the +Zn groups. The plasma and hepatic lipid levels were also lower in the -Zn groups. While the +Zn groups selectively ingested LD and FD at an n-6/n-3 ratio of approximately 3, the n-6/n-3 ratio was 1.9 in the -ZnLD group and 6.6 in the -ZnFD group. These results suggest that the +Zn groups were capable of taking in essential fatty acids at a fixed n-6/n-3 ratio, and that deficient Zn intake appeared to reduce this ability.

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© 2013 Japan Society of Nutrition and Food Science
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