Abstract

Crompton D. W. T., Singhvi A., Nesheim M. C. and Walters D. E. 1981. Competition for dietary fructose between Moniliformis (Acanthocephala) and growing rats. International journal for Parasitology 11: 457–461. The food intake, weight gain and blood sugar of young rats, fed on diets containing growth-limiting amounts of fructose and infected with Moniliformis dubius (Acanthocephala) for 6 weeks, were measured and compared with values obtained from similar uninfected rats which had been treated in the same manner. The growth of the rats was closely related to the fructose content of the diet. However, on average, the infected rats gained less weight than their uninfected counterparts. Significant differences between the values for blood sugar from infected and uninfected rats were not detected when the diet contained 2% fructose. The blood sugar of infected rats fed on a diet containing 4% fructose was found to be significantly less than that of similar uninfected rats. Information was also obtained about the numbers, sex, dry weight and location of the Moniliformis in the small intestines of their hosts. Male and female Moniliformis from rats fed on the 4% fructose diet were found to be heavier than those from rats fed on the 2% fructose diet. The results can be interpreted to suggest that the reduction in the growth rate of the infected rats is due to competition for fructose between Moniliformis and the rat.

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