Skip to main content

View full-text article in PMC

. 2019 Jul 31;61(4):239–244. doi: 10.5187/jast.2019.61.4.239

Table 2. Effects of intravenous administration of L-tryptophan on serum melatonin and gastrointestinal hormones concentrations in Hanwoo steers.

		Control	L-tryptophan
		Control	28.9 mg/kg	57.8 mg/kg
Melatonin (pg/mL)	Before¹⁾	51.70 ± 4.970	58.85 ± 4.455	64.30 ± 5.185
	After²⁾	58.25 ± 2.985^b	64.25 ± 3.125^ab	72.10 ± 3.020^a
	Mean³⁾	56.95 ± 2.595^b	63.15 ± 2.650^ab	70.55 ± 2.655^a
	Increment⁴⁾	6.55 ± 2.985	5.40 ± 3.125	7.80 ± 3.020
Cholecystokinin (ng/mL)	Before	7.09 ± 0.419	8.11 ± 0.684	9.73 ± 2.164
	After	8.06 ± 1.012^b	10.39 ± 0.712^b	17.24 ± 2.416^a
	Mean	7.86 ± 0.813^b	9.93 ± 0.605^b	15.74 ± 2.044^a
	Increment	0.97 ± 1.012^b	2.28 ± 0.712^b	7.52 ± 2.416^a
Secretin (ng/mL)	Before	7.93 ± 2.542	7.93 ± 2.606	7.94 ± 2.565
	After	7.52 ± 1.268^b	9.78 ± 0.924^b	15.02 ± 2.790^a
	Mean	7.60 ± 1.116^b	9.41 ± 0.892^ab	13.60 ± 2.333^a
	Increment	−0.41 ± 1.268^b	1.85 ± 0.924^b	7.08 ± 2.790^a
Ghrelin (ng/mL)	Before	16.19 ± 1.987	14.65 ± 4.500	21.45 ± 3.452
	After	19.99 ± 1.419	15.88 ± 1.814	17.90 ± 1.366
	Mean	19.23 ± 1.222	15.63 ± 1.672	18.61 ± 1.290
	Increment	3.80 ± 1.419^a	1.23 ± 1.814^a	−3.55 ± 1.366^b

¹⁾

Before, average −60 to zero min before jugular vein injection of L-tryptophan.

²⁾

After, average zero to 300 min after jugular vein injection of L-tryptophan.

³⁾

Total, average −60 to 300 min during jugular vein injection of L-tryptophan.

⁴⁾

Increment, after and before.

^a–c

in rows p < 0.05.