Table 2.

Summary of commercial farms enrolled onto experiment 2

	Diet group
	CPO	EL	CPLO	MR	SEM 1
No. of farms	5	6	6	5	–
Average herd size 2	253	152	213	153	19.3
Average number of cows in milk 2	226	119	180	141	17.8
Annual yield (l/cow) 2	8870	8607	8044	8313	267.7
Average grass silage : maize silage in forage portion of diet (fresh weight basis) 2	57 : 43	75 : 25	55 : 45	59 : 41	–
Ratio of all-year-round : seasonal calving herds 2	2 : 3	5 : 1	2 : 4	4 : 1	–

CPO=calcium salts of palm oil distillate; EL=extruded linseed; CPLO=calcium salts of palm and linseed oil distillate; MR=milled rapeseed.

¹ SEM for n=22 values.

² Information obtained from National Milk Records or from farms directly before the study.