Administration of encapsulated L-tryptophan improves duodenal starch digestion and increases gastrointestinal hormones secretions in beef cattle

Autor: Sang-Bum Lee, Kyung-Won Lee, Tao Wang, Jae-Sung Lee, U-Suk Jung, Jalil Ghassemi Nejad, Young-Kyoon Oh, Youl-Chang Baek, Kyoung Hoon Kim, Hong-Gu Lee
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Asian-Australasian Journal of Animal Sciences, Vol 33, Iss 1, Pp 91-99 (2020)
Druh dokumentu: article
ISSN: 1011-2367
1976-5517
DOI: 10.5713/ajas.19.0498
Popis: Objective This study investigated the effects of oral administration of rumen-protected L-tryptophan (RPL-T) on duodenal starch digestion and gastrointestinal hormones (GIH) secretions using Hanwoo beef steers as the animal models. Methods Four steers (423±24 kg) fitted with ruminal and duodenal cannulas were employed in a crossover design replicated twice. Treatments were control (basal diet) and RPL-T (basal diet+191.1 mg/kg body weight [BW]) group. Blood and duodenal samples were collected to measure serum GIH levels and pancreatic α-amylase activity at day 0, 1, 3, and 5 (−30, 30, 90, 150, and 210 min) of the study. Samples from each segment of the gastrointestinal tract were collected via ruminal and duodenal cannulas and were used to determine soluble protein and the starch digestion rate at days 6 (−30, 180, 360, and 540 min) and 8 (−30, 90, 270, and 450 min) of the experiment. Results No significant difference in ruminal pH, NH3-N, and total volatile fatty acid including the levels of acetate, propionate, butyrate, isobutyrate, valerate, isovalerate, and the acetate-to-propionate ratio was observed between groups (p>0.05). Crude protein uptake was higher and feces starch content was lower in RPL-T group than the control group (p0.05). Serum cholecystokinin (CCK), melatonin, duodenal pancreatic α-amylase activity, and starch digestion were significantly higher in RPL-T group than the control group (p
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