Table 1
Herd size, farming system (Free stall: FS; Cubicle with earthen paddocks: CEP), average daily milk yield per cow, dry matter intake (DMI), contaminated feeds in the ration, inclusion rate of clinoptilolite (% dry matter; % DM) and grouping according to the particle size of clinoptilolite (SC: <0.15 mm, LC: <0.8 mm) in the 15 farms (F1 to F15) included in the study

Group	Farm I.D.	Herd Size	Farming system	Average daily milk yield (kg)	DMI (kg)	Clinoptilolite inclusion rate (% DM)	Contaminated feeda
SC	F1	220	CEP	32	20.6	0.97	Corn silage
SC	F2	246	CEP	30	20	1.00	Corn silage
SC	F5	125	CEP	30	20	1.00	DDGSb
SC	F6	172	FS	33	20.5	0.98	Maize grains & cottonseed meal
SC	F8	50	FS	25	18.8	1.06	Maize grains
SC	F9	87	FS	27	19.2	1.04	Maize grains
SC	F10	120	CEP	31	20.2	0.99	Maize grains
SC	F11	136	CEP	36	22.0	0.91	Maize grains
SC	F13	175	FS	29	19.9	1.01	N/Dc
LC	F3	180	FS	28	19.5	1.03	DDGSb
LC	F4	146	FS	33	20.8	0.96	Corn silage
LC	F7	163	CEP	29	19.7	1.02	Maize grains
LC	F12	90	FS	35	21.8	0.92	Maize grains
LC	F14	74	FS	26	18.7	1.07	N/Dc
LC	F15	150	FS	33	20.2	0.99	N/Dc