. 2024 Oct 5;102:skae298. doi: 10.1093/jas/skae298

Table 2.

Average total feed intake, intake of nutrients, nutrient digestibility, fecal output and fecal N excretion, BUN, and performance by 4 groups of lambs (N = 8) receiving 2-way choices between isoenergetic feeds that varied in the concentration of CP and the addition of a mix (4% DM) of condensed and hydrolizable tannins

	Treatment¹
	HP − LP−	HP − LP+	HP + LP−	HP + LP+	SE	P value
Total feed intake, g	1,623^a	1,542^ab	1,394^b	1,605^a	88.20	0.03
Intake of DM, g/kg BW	41.3^a	42.4^a	39.1^b	41.7^a	0.49	0.04
Intake of CP, g/kg BW	10.1^a	10.2^a	8.0^c	9.2^b	0.50	0.02
Intake of NDF, g/kg BW	14.2^ab	13.6^c	13.8^bc	14.4^a	0.21	0.02
Intake of ADF, g/kg BW	9.4^a	9.4^a	8.5^b	9.2^a	0.20	0.02
Tannin intake, g/Kg BW	—	0.68^c	0.86^b	1.80^a	0.49	<0.0001
Fecal output, g	354^a	323^b	316^b	349^a	4.60	<0.0001
Fecal N excretion, g	10.6^b	11.4^b	11.6^b	14.1^a	0.24	0.03
DM digestibility, %	76.5^ab	77.6^a	75.4^b	76.2^b	0.32	<0.0001
CP digestibility, %	82.3^a	80.7^a	72.9^b	73.4^b	1.06	<0.0001
NDF digestibility, %	62.3^c	63.8^bc	65.2^b	67.8^a	0.67	<0.0001
ADG, kg/d	0.32	0.28	0.26	0.32	0.03	0.39
Gain:feed ratio, g/g	0.191^bc	0.178^a	0.184^ab	0.193^c	0.068	<0.0001
Final weight, kg	44.4	41.6	40.3	44.4	2.75	0.64
BUN, mg/dL	24.4^a	19.9^ab	21.3^ab	18.0^b	1.36	0.02

¹Lambs received a simultaneous offer of diets with low (LP) and high (HP) concentrations of CP (Control; HP − LP−); LP + tannins and HP (HP − LP+); LP and HP + tannins (HP + LP−); and both LP and HP with tannins (HP + LP+).

SE, standard error; DM, dry matter; CP, crude protein; NDF, neutral detergent fiber; ADF, acid detergent fiber; ADG, average daily gain; BUN, blood urea nitrogen.

Means within a row followed by different superscript letters differ (P < 0.05).