Fatty acid profiles, including CLA isomers and long chain PUFA, in ileal digesta of growing gilts fed flaxseed or tallow containing diets
2010
Martínez-Ramírez, H.R. | Kramer, J.K.G. | de Lange, C.F.M.
The objective of this study was to characterize fatty acid (FA) profiles in digesta collected from distal ileum in growing gilts slaughtered at 50 (n=5) or 110kg BW (n=20) fed either a flaxseed (FS) or beef tallow (BT) supplement, between 25 and 50 or 85 and 110kg BW. The FA contents were expressed as proportions of total analyzed FA contents. The results showed that at both slaughter BW 18:0 and the cis-monounsaturated FA in ileal digesta were similar among fat sources. At both BW, total trans-18:1 FA content was higher in digesta for BT than FS (0.52 vs. 0.18% and 0.43 vs. 0.19% at 50 and 110kg BW, respectively, P <0.05). At 50kg BW, total conjugated linoleic acid (CLA; 0.16 vs. 0.13%) and 22:6n−3 (0.24 vs. 0.16%) contents were not affected by dietary fat source, whereas at 110kg BW total CLA (0.25 vs. 0.16%) and 22:6n−3 (0.26 vs. 0.11%) were higher for BT than FS (P <0.05). Calculations showed that the dietary content of CLA and 22:6n−3 was lower than that found in the ileal digesta suggesting possible synthesis of both FA in pig's gut. The extent of their synthesis and absorption needs further investigation.
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