Effects of dietary protein/energy ratio on growth performance, carcass trait, meat quality, and plasma metabolites in pigs of different genotypes

Liu, Yingying; Kong, Xiangfeng; Jiang, Guoli; Tan, Bi’e; Deng, Jinping; Yang, Xiaojian; Li, Fengna; Xiong, Xia; Yin, Yulong

doi:10.1186/s40104-015-0036-x

Journal of Animal Science and Biotechnology

Table 4 Effects of dietary protein/energy ratio and breed on carcass performance in pigs

From: Effects of dietary protein/energy ratio on growth performance, carcass trait, meat quality, and plasma metabolites in pigs of different genotypes

Item	Landrace pig		Bama mini-pig		SEM	P-value
Item	GB diets	NRC diets	GB diets	NRC diets	SEM	Breed	Diet	B × D
Nursery phase
Pre-slaughter BW, kg	19.39^a	19.15^a	12.00^b	14.40^b	0.84	<0.001	0.21	0.13
Left carcass BW, kg	6.25^a	6.17^a	3.20^c	4.19^b	0.32	<0.001	0.16	0.10
Dressing percentage, %	64.29^a	64.15^a	53.26^c	58.16^b	1.32	<0.001	0.08	0.06
Carcass length (bevel), cm	25.69^a	23.76^a	14.92^b	15.69^b	1.13	<0.001	0.61	0.24
Carcass length (straight), cm	24.04^a	21.72^a	13.56^b	14.35^b	1.03	<0.001	0.46	0.14
Backfat thickness, mm	7.78^a	5.64^b	6.81^ab	7.19^ab	0.52	0.75	0.78	0.14
Loin-eye area, mm²	904.40^b	1,124.20^a	372.30^c	437.80^c	73.41	<0.001	0.06	0.30
Total skeletal muscle, %	61.23^a	65.75^a	47.70^b	46.38^b	1.58	<0.001	0.32	0.07
Total fat, %	6.47^b	3.63^b	19.36^a	23.54^a	1.56	<0.001	0.67	0.03
Growing phase
Pre-slaughter BW, kg	58.51^a	49.21^b	33.62^c	34.36^c	1.87	<0.001	0.05	0.02
Left carcass BW, kg	20.98^a	17.66^b	10.91^c	11.23^c	0.71	<0.001	0.07	0.03
Dressing percentage, %	71.67^a	71.74^a	65.04^b	65.13^b	0.97	<0.001	0.94	0.99
Carcass length (bevel), cm	85.21^a	80.57^b	69.33^c	69.29^c	1.18	<0.001	0.08	0.08
Carcass length (straight), cm	82.07^a	76.57^b	59.00^c	61.29^c	1.12	<0.001	0.20	0.004
Backfat thickness, mm	6.07^b	6.54^b	30.70^a	33.36^a	1.33	<0.001	0.29	0.46
Loin-eye area, mm²	1,919.70^a	1,724.20^a	696.70^b	671.70^b	120.20	<0.001	0.41	0.52
Total skeletal muscle, %	66.53^a	62.97^b	40.70^c	40.08^c	1.08	<0.001	0.09	0.22
Total fat, %	10.07^c	13.45^b	34.60^a	35.88^a	0.87	<0.001	0.02	0.28
Finishing phase
Pre-slaughter BW, kg	86.79^a	92.03^a	49.84^b	49.19^b	2.15	<0.001	0.36	0.24
Left carcass BW, kg	32.39^a	34.79^a	17.14^b	17.69^b	0.90	<0.001	0.16	0.38
Dressing percentage, %	74.50^a	75.61^a	68.91^c	71.90^b	0.76	<0.001	0.03	0.29
Carcass length (bevel), cm	92.29^a	92.00^a	81.80^b	78.86^b	1.32	<0.001	0.30	0.39
Carcass length (straight), cm	87.40^a	87.83^a	79.90^b	77.00^b	1.22	<0.001	0.39	0.25
Backfat thickness, mm	22.69^b	23.52^b	40.40^a	43.29^a	1.42	<0.001	0.27	0.53
Loin-eye area, mm²	3,303.90^a	2,836.60^a	1,018.50^b	812.40^b	155.78	<0.001	0.07	0.47
Total skeletal muscle, %	61.84^a	62.73^a	37.40^b	38.38^b	0.97	<0.001	0.41	0.98
Total fat, %	15.65^b	16.81^b	38.00^a	37.85^a	1.01	<0.001	0.67	0.57

^{a, b, c} Mean values with unlike superscript letters were significantly different (P < 0.05). n = 8
GB diets, Chinese conventional diets; B × D, breed × diet interaction

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ISSN: 2049-1891

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