Influence of barley in diet on the fatty acid and triglyceride composition of broiler abdominal fat

This experiment was conducted to study the effects of barley in dlet on the properties of broiler fat. Broilers (White Cornish male×White Plymouth Rock female) were reared from 28 to 70 days of age on the diets of different supplement levels of barley. Samples of fats used for analysis were obtained from abdominal adipose tissues which were taken from five males and five females randomly selected in each experimental lot. The concentration of C16:0 and C18:2 in diet lipids increased and the concentration of C18:0 and C18:1 decreased as the supplemental level of barley in diets increased. Abdominal fats of male broilers had a tendency of more C18:2 and less C16:1 and C18:1 than those of females, but the difference in fatty acid composition of broiler fats depending on sex was rather small as compared to the influence of diets. As the level of supplementation of barley in experimental diets increased, the concentration of C14:0, C14:1, C16:0, C16:1 and saturated acid increased and the concentrations of C18:2 and unsaturated acid decreased in the abdominal fats of broilers fed those diets. In the composition of fatty acid located on the 1-and 3-position of triglycerides and also in the 2-monoglycerides derived from the triglycerides, the concentrations of C16:0, C16:1 and saturated acid were higher and the concentrations of C18:2 and unsaturated acid were lower in fats of broilers fed barley supplemented diets as compared to those of the broilers fed basal diets. Then, it was considered that the influences of diets on the fatty acid distribution in broiler fats triglycerides were more distinctly appeared on the acyl groups located on the 1-and 3-position than on the 2-position of triglycerides. As the supplemental level of barley in diets increased, the contents of trisaturated and disaturated triglycerides in broiler fats tended to increase and the contents of triunsaturated glycerides tended to decrease. And, fats of broilers fed highly barley supplemented diets contained significantly more tripalmitin and 1, 3-dipalmito-2-olein and significantly less 1-stearo -2-linoleo-3-olein and 1-oleo-2, 3-dilinolein as compared to those of broilers fed basal diet.