Table 2.

The average concentration of the six phytoestrogens (ng·mL⁻¹) in the plasma of the control (C n = 5) and treated (T n = 10) cattle over the 21-day grazing period. Significant differences (p < 0.05) were observed between the control and treatment groups. p values indicate significant differences among cultivars for each metabolite.

	Day 0		Day 4		Day 12		Day 20
	C	T	C	T	C	T	C	T
genistein	0.312 ± 0.01	0.651 ± 0.05	0.613 ± 0.06	1.279 ± 0.14	0.996 ± 0.04	2.079 ± 1.10	1.971 ± 1.08	3.912 ± 1.98
formononetin	0.134 ± 0.01	0.379 ± 0.02	0.263 ± 0.04	0.745 ± 0.07	0.427 ± 0.08	1.210 ± 0.91	0.845 ± 0.08	2.316 ± 0.91
daidzein	2.796 ± 1.12	1.758 ± 1.02	5.497 ± 2.12	3.456 ± 1.24	3.383 ± 1.15	5.616 ± 2.58	6.693 ± 3.35	10.925 ± 3.98
coumestrol	TD	0.285 ± 0.01	TD	0.561 ± 0.04	ND	0.911 ± 0.18	ND	1.739 ± 1.08
4′methoxycoumestrol	ND	0.015 ± 0.01	ND	0.030 ± 0.01	ND	0.049 ± 0.01	ND	0.092 ± 0.08
3′methoxycoumestrol	ND	0.017 ± 0.01	ND	0.033 ± 0.01	ND	0.054 ± 0.02	ND	0.205 ± 0.04
p-value	0.003		0.003		0.009		0.007

TD = Trace amounts detected. ND = Undetected.