Fatty Acid Composition of Diets, Metabolism, and Deposition in Subcutaneous Adipose Tissue of Pasture and Feedlot Finished Cattle
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Â Â Â The high-concentrate diet consisted of 57 % linoleic acid and 7 % linolenic acid (of total fatty acids).Â The pasture forages contained an average 9 % linoleic acid and 66 % linolenic acid (of total fatty acids).
Â Â Â Adipose tissue concentrations of 18:2 cis-9, trans-11 CLA were higher (P < 0.05) in the pasture-finished steers than high-concentrate finished steers.Â Concentrations of 18:2 cis-9, trans-11 CLA declined in the high-concentrate finished steers (P < 0.05) from d 0 to 28 and d 28 to 84.Â In the pasture-finished steers concentrations peaked (P < 0.10) on d 28, and remained high throughout the duration of the study.
Â Â Â Concentrations
of linolenic acid were higher (P < 0.05) in adipose tissue, ruminal
fluid, and serum of the pasture-finished steers, compared to the high-concentrate
finished steers.Â In the pasture-finished steers linolenic acid concentrations
peaked (P < 0.05) on d 28, and remained high throughout the study.Â
Concentrations of linolenic acid gradually decreased (P < 0.05) over
time within the high-concentrate finished steers.Â Thus, it appears
that only a short time is needed to alter the omega-3 and CLA composition
of adipose tissue in cattle finished on pasture.
- Doctoral Dissertations