and 130-kg boars and gilts. Can. J. Anim. Forty-nine boars and 13 gilts were fed ad libitum from 20 to 100 kg body weight.Fifteen boars and four gilts were slaughtered at 100 kg and the remaining animals were fed ad libitum or at 70Vo of ad libitum feed intake from 100 kg liveweight until they were slaughtered at 130 kg. Backfat samples were collected from the lumbar region of all pig carcasses at both slaughter weights, vacuum packaged and stored at -20'C. Fat samples (10 g) were saponified and extracted with hexane and ether. Extracts were evaporated under nitrogen, and androstenol (5cr-androst-16-en-3ct-o1; 5ct-androst-16-en-3B-ol) and androstenone (5ct-androst-16-en-3-one; 5p-androst-16-en-3-one) were quantified by gas chromatography using 5ct-androstane-3, 17-dione as internal standard. A trained panel of eight women scored the odor intensity of each fat sample on a scale of 1 (no odor) to 6 (strong odor). of ad libitum fed boars. There was a significant quadratic response of odor intensity determined by vial test to increasing androstenol concentration in fat (Rr:507o) but the relationship between odor score and steroid content was otherwise linear. The concentration of androstenol in boar backfat was only one-half of the androstenone concentration but it explained some variation in odor score over and above that which was explained by androstenone.
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