Table 5. Content of amino acids in neck meats from donkey, swine, bovine, and sheep (mg/100 g)

Category	Amino acids	Taste description	Donkey	Swine	Bovine	Sheep
Essential	Val	Bitter	5.70±0.81^a	1.49±0.08^c	2.30±0.10^b	1.15±0.11^d
	Ile	Bitter	4.92±1.14^a	0.52±0.53^b	0.53±0.67^b	0.61±0.36^b
	Leu	Bitter	7.28±1.18^a	0.61±0.09^b	0.73±0.08^b	0.74±0.13^b
	Phe	Bitter	4.30±0.85^a	2.99±0.18^b	3.13±0.27^b	2.12±0.19^c
	Lys	Bitter	14.63±0.88^a	1.12±0.19^b	0.23±0.09^c	0.16±0.08^c
	Thr	Sweet	5.72±0.96^a	0.40±0.10^b	0.45±0.18^b	0.50±0.24^b
	Total		42.55±5.21^a	7.13±2.14^b	7.37±1.62^b	5.28±1.17^c
Non-essential	Tyr	Bitter	3.21±0.28^a	2.53±0.10^b	1.84±0.15^c	1.49±0.16^c
	Asp	Umami	5.75±0.64^a	6.13±0.52^a	6.09±0.42^a	6.24±0.54^a
	Ser	Sweet	8.85±1.25^a	0.51±0.16^b	0.29±0.08^c	0.55±0.10^b
	Glu	Umami	12.65±1.22^a	3.82±0.09^b	3.93±0.08^b	3.83±0.11^b
	Gly	Sweet	9.48±0.98^a	0.39±0.02^b	0.39±0.01^b	0.40±0.03^b
	Ala	Sweet	39.38±3.58^a	5.41±0.98^b	1.65±0.16^c	0.91±0.06^d
	His	Bitter/Sour	4.89±0.28^a	0.42±0.02^c	0.44±0.01^c	0.66±0.04^b
	Arg	Bitter	6.92±1.07^a	0.70±0.11^b	0.84±0.10^b	0.96±0.16^b
	Pro	Sweet	3.40±0.31^b	1.70±0.09^c	8.39±0.88^a	7.60±0.60^a
	Total		137.07±1.27^a	27.73±0.58^c	31.23±0.79^b	27.92±0.61^c

Values are means±SD of three determinations, the same letters marked on the same line indicate no significant difference (p≥0.05), while the different superscripts indicate significant difference (p<0.05).