The isolation from ethylene dichloride extracted wheat germ oil (edc-wgo) of long-chain alcoholic compounds which exhibit androgen-like properties has recently been reported (Levin, Collins, Varner, Mosser & Wolf, 1962; Levin, 1963). Improved fertility has been reported in hamsters (Soderwall & Smith, 1962), cattle (Marion, 1962) and sheep (Dukelow & Matalamaki, 1963) following the use of edc-wgo as a food supplement. This communication records findings on sows which were fed the agent before mating until slaughtered during early pregnancy.Eighty sows (11 to 12 months of age) of mixed breeding were allotted either to a treated or a control group immediately after weaning their first litter. The treated group received 60 ml edc-wgo/week. This oil was pre-mixed with the soybean oil meal fraction of the feed and then incorporated in a normal 14% protein ration. No wheat or wheat
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