0
Four male pigs (Duroc x Landrace x Yorkshire), were individually housed in metabolism crates in a temperature controlled room. Pigs were surgically fitted with chronic catheters in the portal vein, ileal vein and carotid artery. Four diets were formulated with maize, brown rice and sticky rice and RS to contain the same level of carbohydrates as well as lysine, methionine + cysteine, threonine and tryptophan. Each diet was tested following a Latin Square design with four experimental periods. Each period consisted of 6 days of adaptation and 1 day of blood collection. Blood samples were used to determine glucose, amino acid, packed cell volume and partial pressure of oxygen.
Cumulative portal glucose appearance was lower (P<0.05) for RS than for maize, sticky rice or brown rice up to 8 h after the meal. Cumulative portal glucose appearance was higher (P<0.05) for sticky rice and brown rice than for other diets until 4 h after a meal, but maize had higher cumulative glucose appearance after 4 h. Net cumulative portal concentrations of most amino acids for resistant starch were also reduced (P<0.05) than for the other starch sources. Cumulative portal appearance of amino acid represented 48.4%, 63.8%, 61.8% and 59.2% of dietary intake for resistant starch, maize, sticky rice and brown rice.
It is concluded that dietary starch sources affect the appearance of amino acids and glucose in the portal circulation.
TJ Li, QZ Dai, YL Yin, J Zhang, RL Huang, Z Ruan, Z Deng and M Xie (2008), Animal, 2 (5): 723-729
