Table 1. Pulsatile patterns of LH in the jugular vein for cows treated with saline or GnRH during the mid-luteal phase.

LH characteristic	Group	6 h before treatment	6 h after treatment
Mean concentration (ng/ml)	Saline (n=3)	0.38 ± 0.05	0.38 ± 0.05
	GnRH (n=4)	0.32 ± 0.03	0.50 ± 0.06*†
Basal concentration (ng/ml)	Saline (n=3)	0.31 ± 0.01	0.33 ± 0.01
	GnRH (n=4)	0.23 ± 0.02	0.38 ± 0.03†
Pulse frequency (pulses/6 h)	Saline (n=3)	4.0 ± 0.6	3.0 ± 0.0
	GnRH (n=4)	3.0 ± 0.4	5.3 ± 0.3*†
Pulse amplitude (ng/ml)	Saline (n=3)	0.31 ± 0.05	0.44 ± 0.07
	GnRH (n=4)	0.29 ± 0.04	0.30 ± 0.06

Values are means ± SE. * Different (P<0.05) vs. saline group. ^† Different (P<0.05) vs. 6 h before treatment.