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KMID : 1025520190610040239
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Journal of Animal Science and Technology
2019 Volume.61 No. 4 p.239 ~ p.244
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Intravenous administration of L-tryptophan stimulates gastrointestinal hormones and melatonin secretions: study on beef cattle
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Lee Sang-Bum
Lee Kyung-Won
Wang Tao
Lee Jae-Sung
Jung U-Suk
Nejad Jalil Ghassemi
Oh Young-Kyoon
Baek Youl-Chang
Kim Kyoung-Hoon
Lee Hong-Gu
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Abstract
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This study aimed to determine the effective dose of intravenous administration of L-tryptophan (L-T) on gastrointestinal hormones (GIH) secretions and melatonin using Hanwoo cattle. Three steers (362 ± 23 kg) fitted with indwelling jugular vein catheters were assigned in a 3 × 3 Latin square design. Treatments were intravenous administration of saline (control), 28.9 mg L-T/kg body weight (BW; low) and 57.8 mg L-T/kg BW (high) L-T for 1 day with 7 days of adaptation. Samples were collected after adaptation period at ?60, 0, 30, 60, 90, 120, 150, 180, 240, and 300 min of sampling day. The levels of serum cholecystokinin (CCK) and secretin were higher (p < 0.05) in the high L-T group than those in the other groups. Serum Melatonin (MEL) levels were increased upon L-T administration (p < 0.05) in the high L-T group. Taken together, the effective dose of L-T administration was defined at 57.8 mg L-T/kg BW in order to stimulate increase of GIH and MEL.
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KEYWORD
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Amino acid, Cholecystokinin, Ghrelin, Melatonin, L-Tryptophan
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