Table 3.

Effect of concentrate supplementation and cow strain and their interaction on grazing and rumination behaviour and physical activity over 24 h

	Conc0		Conc6			P-value
Items	HCH	HNZ	HCH	HNZ	SD	Treatment	Cow strain	Interaction
Grazing behaviour over 24 h
Time (min)	547.1A	568.7A	442.9B	453.0B	43.9	<0.001	0.20	0.63
Mastications (n)	41 232A	42 102A	32 070B	32 865B	3859	<0.001	0.51	0.97
Mastication rate (n/min)	75.3A	74.0A	72.5B	72.7B	4.0	<0.001	0.73	0.06
Grazing bouts (n)	5.2	5.7	5.5	6.0	0.94	0.24	0.10	0.81
Duration of grazing bouts (min)	110A	104A	81B	78B	18.8	<0.001	0.42	0.77
Rumination behaviour over 24 h
Time (min)	381a	405b	398a	423b	40.8	0.15	<0.05	0.99
Mastications (n)	27 661a	29 796b	28 888a	31 204b	3932	0.20	0.04	0.93
Mastication rate (n/min)	72.4	73.4	72.7	73.7	5.3	0.47	0.48	0.92
Rumination boli (n)	522a	578b	551a	597b	69.2	0.22	0.04	0.79
Mastications boli (n/boli)	51.5	53.8	54.9	53.4	5.0	0.26	0.83	0.17
Rumination bouts (n)	13.1	12.2	13.1	12.7	1.58	0.56	0.14	0.48
Duration of rumination bouts (min)	29	35	31	34	7.0	0.95	0.08	0.40
Activity over 24 h
Lying (min)	492A	541A	564B	590B	62	<0.001	0.05	0.41
Standing+moving (min)	949A	900A	877B	851B	62	<0.001	0.05	0.41
Walking (min)	421A	419A	373B	362B	59	<0.001	0.75	0.73

Conc0=cows without concentrate supplementation; Conc6=cows with concentrate supplementation; HCH=Swiss Holstein-Friesian; HNZ=New Zealand Holstein-Friesian.

^A,BMeans with different superscript letters within the same row differ (P<0.01).

^a,bMeans with different superscript letters within the same row differ (P<0.05).