Table 3.

Effect of tributyrin on dietary nutrient digestibility and losses in weaned Small-Tailed Han female lambs.

Items	Tributyrin additions, g/kg DM basis					SEM	P-values1
	0	0.5	1.0	2.0	4.0		Contrast	Linear	Quadratic
N intake, g/d	25.5c	27.2bc	28.1b	28.2b	30.7a	0.69	<0.01	<0.01	0.56
Faecal N, g/d	14.0a	12.1b	12.7ab	12.8ab	12.5b	0.44	<0.01	0.11	0.40
Urinary N, g/d	1.10a	0.85b	0.79b	0.65b	0.80b	0.077	<0.01	<0.01	0.33
N loss, %	59.2a	48.4b	49.7b	50.0b	44.4b	1.92	<0.01	<0.01	0.61
Faecal N loss, %	54.8a	45.2bc	46.9bc	47.6b	41.7c	1.87	<0.01	<0.01	0.68
Urinary N loss, %	4.4a	3.2b	2.8b	2.4b	2.7b	0.28	<0.01	<0.01	0.48
NDF intake, g/d	324b	345ab	357a	358a	389a	8.1	<0.01	<0.01	0.54
Faecal NDF, g/d	240	235	232	228	217	9.6	0.24	0.07	0.91
NDF digestibility, %	26.2c	32.4bc	33.3ab	35.9ab	43.2a	2.46	<0.01	<0.01	0.85
ADF intake, g/d	211c	225bc	232b	232b	252a	5.6	<0.01	<0.01	0.57
Faecal ADF, g/d	162	169	178	166	163	7.2	0.37	0.95	0.36
ADF digestibility, %	23.7b	25.5b	21.4b	29.1ab	34.9a	2.69	0.03	<0.01	0.17
Daily Ca intake, g/d	6.1c	6.5bc	6.8b	6.7b	7.4a	0.20	<0.01	<0.01	0.52
Faecal Ca, mg/d	485	462	455	460	485	28.8	0.83	0.90	0.97
Urinary Ca, g/d	3.4	3.4	3.0	3.2	3.4	0.15	0.25	0.54	0.27
Dietary Ca loss, %	65.3a	59.2ab	52.4b	55.6b	53.5b	2.44	<0.01	<0.01	0.20
Faecal Ca loss, %	8.1a	7.0ab	6.9ab	7.0ab	6.7b	0.42	0.01	0.04	0.87
Urinary Ca loss, %	57.2a	52.2ab	45.5b	48.6b	46.8b	2.32	<0.01	<0.01	0.17
Daily P intake, g/d	3.0c	3.2bc	3.4b	3.4b	3.7a	0.08	<0.01	<0.01	0.52
Faecal P, mg/d	551a	553a	440b	366b	369b	34.1	<0.01	<0.01	0.68
Urinary P, mg/d	49.9a	43.7ab	30.4c	35.4bc	39.0bc	3.22	<0.01	<0.01	0.11
Dietary P loss, %	19.4a	18.4a	14.1b	12.0bc	11.1c	0.85	<0.01	<0.01	0.35
Faecal P loss, %	17.6a	17.0a	13.1b	10.9bc	10.0c	0.86	<0.01	<0.01	0.48
Urinary P loss, %	1.8a	1.4b	0.9c	1.1bc	1.1bc	0.11	<0.01	<0.01	0.11

NDF = neutral detergent fibre; ADF = acid detergent fibre.

^a-c Values within a row with no common superscripts differ significantly (P < 0.05).

¹Linear, linear effect of tributyrin; Quadratic, quadratic effect of tributyrin.