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Introduction: Many research demonstrate the effect of margarine trans fatty acids on many physiological mechanisms in both human and animals. The purpose of this research was to evaluate the effects of margarine oil on reproduction in Wistar rat. Materials and Methods: ‏This is an experimental study in which 46 Wistar female and male rats were divided into 4 groups. Male and female rats in group 1 were fed by 3% Margarine oil and standard food, in group 2 only female rats and in group 3 only male rats had Margarine oil with the standard food. Male and female rats in group 4 (as control group) had only standard food. Administration was started one month pre mating and continued during mating, gestation and lactation periods. After delivery, the pups were assessed for overall number, sex ratio, body weight, and mortality. One way analysis of variance was used for data avalysis. Results: ‏Results showed that weight and female ratio of pups were significantly increased in group 2 as compared to group 1 and control. Also the comparison of pups’ mortality in the four groups showed that pups mortality was increased in group 2 as compared to the other groups. On the other hand there was no significant difference in number of pups in the four groups. Conclusion: The results showed that dietary Margarine oil administration to female rats can significantly increase weight, ratio of female pups and mortality of pups.

Keywords: Margarine, trans fatty acid, dietary fat, rat, reproduction

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