Effect of breed on the deposition in beef muscle and adipose tissue of dietary n-3 polyunsaturated fatty acids.

摘要: This study investigated the effects of dietary n-3 polyunsaturated fatty acids (PUFA) on muscle acid composition and content in two cattle breeds; Holstein-Friesian, a dairy breed, Welsh Black, traditional beef breed. Animals were kept ad libitum grass silage one three concentrates varying source fat; Megalac (high C16 : 0), formaldehyde treated whole linseed C18 3 n-3) combination fish oil C20 5 C22 6 n-3). The offered at approximately 0·4 total dry matter intake. Samples m. longissimus thoracis from Holstein-Friesians contained higher amounts (P < 0·05) than that Blacks neutral lipid, but phospholipid was similar between breeds. Over all treatments, proportion 0·001) lipid proportions 1 trans 0·05 P 0·001, respectively) their subcutaneous adipose tissue. Feeding increased also phospholipids suggesting chain elongation desaturation had occurred. concentration significantly while no differences found for n–3. However, when expressed as acids, both Black phospholipids. These resulted S ratio fat Holstein-Friesian not affected by diet. On other hand, n-6 PUFA lower reflecting content. mixed treatments breeds, delivery these diets. Fortification diet with sources exploiting breed offer potential to develop systems increase human intakes line current nutritional recommendations.