Short-chain fatty acids and medium-chain fatty acids are primarily absorbed through the portal vein during lipid digestion,[6] while long-chain fatty acids are packed into chylomicrons and enter lymphatic capillaries, and enter the blood first at the subclavian vein.
https://en.wikipedia.org/wiki/Short-chain_fatty_acid
Kuksis, Arnis (2000). “Biochemistry of Glycerolipids and Formation of Chylomicrons”. In Christophe, Armand B.; DeVriese, Stephanie. Fat Digestion and Absorption. The American Oil Chemists Society. p. 163. ISBN 189399712X. Retrieved December 21, 2012.