Table 5.

Milk analysis results

	High*		Low†			WP‡	SP§	WP * SP¶
Item	Light	Heavy	Light	Heavy	SE	P value	P value	P value
Milk yield
Yield, kg	2.1	2.4	1.4	2	0.28	<0.08	0.11	0.45
g/kg cow BW	3.92	4.09	2.14	3.18	0.5	<0.02	0.23	0.39
Milk constituents
Fat, %	1.8	1.1	1.2	1.3	0.3	0.46	0.34	0.25
SNF, %	9.3	9.4	9.3	9.1	0.14	0.28	0.84	0.35
TS, %	11	10.6	10.5	10.4	0.29	0.21	0.39	0.49
Protein, %	3.8	3.7	3.6	3.7	0.11	0.34	0.72	0.19
Lactose, %	4.8	5.1a	5	4.7b	0.1	0.57	0.83	<0.01

*High = high WWR group.

^†Low = low WWR group.

^‡Whole plot = cow WWR.

^§Split-plot = cow BW.

^¶Whole-split-plot interaction was the interaction between WWR and cow BW.

P values were considered significant at ≤0.05 and were considered as a trend toward significance at ≤0.1.

^a,bMeans within a row with different superscripts differ (P ≤ 0.05).