Characteristics of temporal patterns of cortisol and luteinizing hormone in primiparous, postpartum, anovular, suckled, beef cows exposed acutely to bulls

Table 3 Linear regression of LH characteristics on cortisol characteristics

Variable	Y-Intercept	Slope^a	R²	P value
Mean, ng/mL	0.67	-0.01	0.01	0.10
Baseline, ng/mL	0.53	0.02	0.52	0.09
Pulse frequency/h	0.57	0.38	0.65	0.06
Pulse amplitude, ng/mL	1.19	-0.04	0.81	0.05
Pulse duration, min	36.5	-0.01	0.06	0.10

Linear regressions of characteristics of LH concentration patterns on characteristics of cortisol concentration patterns (mean, baseline, pulse frequency, pulse amplitude, and pulse duration) in blood samples collected at 15-min intervals between 1000 and 1600 h for postpartum, anovular, suckled cows exposed to bulls (EB) from D 2 through D 8 of a 9-d exposure period. D 0 = Start of the experiment; cows were 67 ± 3.5 d postpartum.
^aUnits for slopes are change in characteristic of LH per change in characteristic of cortisol.

ISSN: 1477-7827