Effects of tallow supplementation on beef longissimus fatty acid distribution.
1989
Boggs D.L. | White F.D. | Reagan J.O. | Smith T.L.
Fatty acid (FA) distribution of the longissimus muscle from steers supplemented with either 0, 4 or 6% tallow for 45 and 75 days were evaluated. Primal ribs were removed (48h, PM), vacuum packaged and stored 21 days at 0 C. After storage, ribs were blast frozen (-32 C) and then stored at -23 C until analyses. A significant interaction between level of tallow (LOT) and time on feed (TOF) for the percentage of myristoleic (C 14:1), palmitoleic (C 16:1), linoleic (C 18:2), and linolenic (C 18:3) was present in the longissimus subcutaneous fat. Tallow feeding (4%) for 45 days increased the percentage of C 14:1 and C 16:1 while decreasing the percentage of C 18:2 and C 18:3 when compared to the 0 and 6% tallow diets at 45 days. Treatments had no effect on any other FAs detected in the longissimus subcutaneous fat (P less than .05). Among the longissimus intramuscular FAs there was an interaction (P less than .05) between the LOT and TOF. The percentage of C 14:1, oleic (C 18:1) and C 18:2 was greater for the 4% tallow diet at 45 days than either the 0 or 6% diets at 45 days. TOF increased the percentage of myristic (C 14:0) and n-pentadecanoic (C 15:0) while decreasing the percentage of stearic (C 18:0) and n-nanodecanoic (C 19:0, P less than .05).
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