Table 5 Apparent digestibility of dry matter (DM), organic matter (OM), neutral detergent fiber (NDF), carbon (C), crude protein (CP), and starch in dairy cows supplemented with four different levels of iodoform (0, 320, 640, and 800 mg/day) intra-ruminally twice daily.

	Iodoform supplementation				SEM	P-values
	0 mg/day	320 mg/day	640 mg/day	800 mg/day	SEM	Treatment	Linear effect	Quadratic effect
Intake during sampling period, kg/day
DM	23.8^a	22.5^ab	17.9^ab	12.9^b	2.60	0.03	< 0.01	0.14
OM	22.0^a	20.8^ab	16.5^ab	11.9^b	2.40	0.03	< 0.01	0.14
NDF	7.55^a	7.13^ab	5.68^ab	4.10^b	0.818	0.03	< 0.01	0.14
C	9.98^a	9.45^ab	7.52^ab	5.42^b	1.09	0.03	< 0.01	0.14
CP	3.84^a	3.63^ab	2.90^ab	2.10^b	0.414	0.03	< 0.01	0.14
Starch	3.63^a	3.43^ab	2.73^ab	1.98^b	0.393	0.03	< 0.01	0.14
Apparent ruminal digestibility, g/kg
DM	371	322	284	245	37.6	0.11	< 0.01	0.87
OM	468	432	402	383	27.3	0.14	0.01	0.99
NDF	655	694	665	656	38.1	0.76	0.95	0.32
C	424	367	341	325	29.1	0.11	< 0.01	0.59
CP	− 109	− 229	− 248	− 300	56.3	0.10	0.01	0.52
Starch	865	861	805	806	31.4	0.32	0.07	0.66
Apparent small intestinal digestibility, g/kg
DM	515^b	586^b	602^ab	628^a	23.4	0.02	< 0.01	0.32
OM	483^b	557^ab	574^ab	595^a	25.7	0.03	< 0.01	0.31
C	522^a	604^ab	617^b	630^b	22.2	0.02	< 0.01	0.13
CP	713^b	755^ab	756^a	761^a	10.2	0.03	0.01	0.10
Starch	867	895	902	930	33.9	0.50	0.17	0.92
Apparent large intestinal digestibility, g/kg
DM	161	85.0	103	107	42.8	0.29	0.22	0.15
OM	133	44.1	72.1	80.5	43.2	0.23	0.28	0.10
NDF	179	30.1	47.6	115	57.0	0.09	0.25	0.02
C	122	32.1	50.0	74.3	40.9	0.21	0.28	0.07
CP	89.8	45.1	45.2	57.8	49.5	0.77	0.38	0.47
Starch	− 30.7	− 61.9	55.3	− 99.1	70.1	0.43	0.82	0.76
Apparent total tract digestibility, g/kg
DM	748	745	746	749	11.7	0.98	0.99	0.71
OM	765	761	766	770	11.3	0.91	0.72	0.54
NDF	663	656	669	692	15.2	0.34	0.20	0.18
C	762	758	763	768	12.4	0.90	0.66	0.57
CP	714	713	709	707	17.6	0.98	0.60	0.89
Starch	985	985	984	986	3.40	0.98	0.86	0.91

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