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Summary. Male and female rats were fed a diet deficient in essential fatty acids for 5 months, starting at weaning. Some of these animals received no other treatment, while others were given prostaglandin E2, methyl arachidonate or a regular diet (Purina Lab Chow). At 3 and 6 months of age, the experimental rats were mated with untreated animals. At 3 months, only seven of eleven males fed the fat-free diet alone were fertile, while all males in the other three groups were fertile. At 6 months, five of eleven males fed the fat-free diet alone, ten of eleven males fed the fat-free diet plus methyl arachidonate, and all rats treated with prostaglandin or fed the regular diet were fertile. At 3 months, the females in the group fed the fat-free diet alone had irregular oestrous cycles, a prolonged gestation period and a smaller litter size than those in the other groups. Treatment with PGE2 had a deleterious effect on lactation, the lactation efficiency index being 0\m=.\4 in this group compared to 0\m=.\8to 0\m=.\9in the remaining three groups. At 6 months, most females were fertile and normal numbers of corpora lutea and implantation sites were observed in all groups. Prostaglandin E2 was apparently as effective as methyl arachidonate in preventing the impairment of fertility in rats fed the fat-free diet. Arachidonic acid is the major precursor for biosynthesis of prostaglandins E2 and F2\g=a\.

PROSTAGLANDIN E2 PREVENTS IMPAIRMENT OF FERTILITY IN RATS FED A DIET DEFICIENT IN ESSENTIAL FATTY ACIDS