Supplemental safflower oil affects the fatty acid profile, including conjugated linoleic acid, of lamb

Abstract

The objective of this study was to determine whether increasing levels of dietary safflower oil would alter unsaturated fat (especially CLA) and tocopherol content of lamb, animal performance, carcass characteristics, or color stability of lamb muscle tissue. Targhee x Rambouillet wethers (n = 60) were assigned to one of three diets (four pens per treatment with five lambs per pen) in a completely random design. Diets were formulated with supplemental safflower oil at 0 (control), 3, or 6% (as-fed basis) of the diet. Diets containing approximately 80% concentrate and 20% roughage were formulated, on a DM basis, to be isocaloric and isonitrogenous and to meet or exceed NRC requirements for Ca, P, and other nutrients. A subsample of 12 wethers per treatment was selected based on average BW (54 kg) and slaughtered. Carcass data (LM area, fat thickness, and internal fat content) and wholesale cut weight (leg, loin, rack, shoulder, breast, and foreshank), along with fatty acid, tocopherol, and color analysis, were determined on each carcass. The LM and infraspinatus were sampled for fatty acid profile. Increasing safflower oil supplementation from 0 to 3 or 6% increased the proportion of linoleic acid in the diet from 49.93 to 55.32 to 62.38%, respectively, whereas the percentage of oleic acid decreased from 27.94 to 23.80 to 20.73%, respectively. The percentage of oil in the diet did not (P > or = 0.11) alter the growth and carcass characteristics of lambs, nor did it alter the tocopherol content or color stability of meat. Increasing levels of safflower oil in lamb diets decreased (P < 0.01) the weight percentage of oleic acid in the infraspinatus and LM, and increased linoleic acid (P < 0.01). Oil supplementation increased (P < 0.01) the weight percentage of various isomers of CLA in muscle, with the greatest change in the cis-9,trans-11 isomer. Supplementation of sheep diets with safflower oil, up to 6% of the diet, resulted in increasing levels of unsaturated fatty acids and CLA in the lean tissue, without adversely affecting growth performance, carcass characteristics, or color stability of lamb.

Effect of various protein sources in feed on the fatty acid composition of adipose depots in lambs

“…C18:1 is the most abundant fatty acid which is in agreement with other studies (Kott et al, 2003;Boles et al, 2005;Juarez et al, 2008). Significant influence of the dietary treatment on C18:1 was observed in subcutaneous and omental fat showing highest content in the group fed rapeseed meal and lowest in the DDGS group.…”

Substituting redberry juniper for oat hay in lamb feedlot diets: Carcass characteristics, adipose tissue fatty acid composition, and sensory panel traits

“…As previously reported (Boles, Kott, Hatfield, Bergman, & Flynn, 2005;Kott et al, 2003), 18:1n−9 was the most abundant adipose tissue fatty acid. Weight percentages of fatty acids were similar (P N 0.16) between lambs fed control and 0JUN diets except that lambs fed the control diet had greater (P b 0.05) weight percentages of 14:0, 18:1trans−6 and trans−10 isomers, total 18:1trans isomers, and percentage of SFA (not including 18:0) than lambs fed 0JUN and tended to have greater (0JUN, 33JUN, 66JUN, and 100JUN).…”

Effects of conjugated linoleic acid supplementation on growth, carcass characteristics and fatty acid profiles of muscle and fat in growing-finishing pigs

“…Researchers have demonstrated that dietary alterations of both ruminant and non-ruminant animals could increase the unsaturated fatty acid and CLA levels of meat, thereby improve its potential health benefits (Boles et al, 2005). The only plausible way to increase muscle CLA content effectively would be to provide chemically synthesized CLA as a dietary supplement in pigs (Joo et al, 2002).…”