Abstract
<p>Fatty acid profiles of backfat (BF), intermuscular fat (IMF), kidney pelvic heart (KPH) fat and tail fat (TF) depots from 15-mo old Angus cross steers finished on grass (GS; n = 18) were compared to those finished on a grain diet (GN ; n = 14) to examine how diet and fat depot impacts fatty acid composition. GS steers grazed an average of 10 months (mo) on ryegrass and white clover irrigated pasture and GN finished steers were a corn based finishing diet for 4 mo. Overall, fat from GS steers contained higher percentages of C6:0 (P = 0.008), C12:0 (P = 0.003), C14:0 (P = 0.001), C16:0 (P = 0.002), C18:3 (P = 0.008), C20:0 (P &lt; 0.001), C18:1 trans9 (P = 0.004), C18:2 cis9 cis12 (P &lt; 0.001) and C18:2 trans9 trans12 (P &lt; 0.001) than GN steers. Fat from GN steers contained higher percentages of C18:0 (P &lt; 0.001). For both GS and GN steers, C18:0 content was higher in the KPH and IMF compared to BF and TF (P = 0.015) depots and C18:1 cis9 content was lower in KPH compared to BF and TF depots (P &lt; 0.001). Therefore, fatty acid composition differs due to diet and differs across depots. Manipulating diets and source of fat (depot) could be used as strategies to modify the fatty acid composition of meat products to increase health benefits to consumers.</p>
Highlights
Adipose tissue is not uniform in fatty acid composition across different depots such as backfat (BF), intermuscular fat (IMF), tail fat (TF), and kidney, pelvic and heart fat (KPH; Pethick et al, 2004)
Fatty acid profiles of backfat (BF), intermuscular fat (IMF), kidney pelvic heart (KPH) fat and tail fat (TF) depots from 15-mo old Angus cross steers finished on grass (GS; n = 18) were compared to those finished on a grain diet (GN ; n = 14) to examine how diet and fat depot impacts fatty acid composition
Fat from GN steers contained higher percentages of C18:0 (P < 0.001). For both GS and GN steers, C18:0 content was higher in the KPH and IMF compared to BF and TF (P = 0.015) depots and C18:1 cis9 content was lower in KPH compared to BF and TF depots (P < 0.001)
Summary
Adipose tissue is not uniform in fatty acid composition across different depots such as backfat (BF), intermuscular fat (IMF), tail fat (TF), and kidney, pelvic and heart fat (KPH; Pethick et al, 2004). This non uniformity has potentially important implications when examining which depots could be incorporated into meat products such as ground beef (Turk & Smith, 2009). The goal of this research is to examine how diet affects fatty acid composition by determining if finishing Angus cross steers on grass or high grain diets alters fatty acid composition of BF, IMF, KPH and TF
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