Rumen-protected methionine and lysine supplementation to the low protein diet improves animal growth through modulating colonic microbiome in lambs

Table 2 Effects of a low-protein diet supplemented with rumen-protected amino acids on growth performance and nutrient digestibility of lambs

Item	Treatments¹			SEM	P-value
Item	CON	LP	LR	SEM	P-value
Growth performance
Dry matter intake, g/d	864.79	853.36	852.76	8.634	0.827
Average daily weight gain, g/d	155.81^a	133.56^b	143.31^ab	3.329	0.012
Feed conversion ratio	5.66	6.43	5.95	0.152	0.097
Nutrient digestibility
Dry matter digestibility, %	77.02	74.21	74.53	0.557	0.072
Crude protein digestibility, %	72.85^a	54.95^b	57.33^b	1.930	< 0.001
NDF digestibility, %	73.26	69.75	69.31	1.008	0.221
ADF digestibility, %	68.13	62.65	62.69	1.113	0.085
Starch digestibility, %	95.24	94.63	94.27	0.530	0.769

¹CON = control diet with crude protein of 112.0 g/kg; LP = low-protein diet with crude protein of 78.4 g/kg; LR = LP + 15 g/d RPMet and 10 g/d RPLys
^a,bValues within a row with different superscripts differ significantly at P < 0.05
NDF Neutral detergent fiber, ADF Acid detergent fiber

ISSN: 2049-1891