Mating Behavior Increases in Workload of Heart in Thoroughbred Stallions

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To evaluate an influence of mating behavior on cardiac function, changes in heart rate (HR), electrocardiogram (ECG), hematocrit (Hct), and serum concentration of alpha-atrial natriuretic peptide (ANP) were evaluated in 10 clinically sound Thoroughbred stallions before and after mating behavior. The stallions were submitted twice to experimental pseudo-mating in same month of 2009 and 2010. Measurements and blood samples were collected at a stable before the mating (baseline), at a covering yard before and after the mating. ECG was recorded by a Holter-ECG system. Arrhythmias were detected in 5 stallions before or after the mating behavior. Minimum HR (HRmin), maximum HR (HRmax) and HR recorded when the stallions entered into the yard (HRent) and ejaculated (HRejc) were 34.2 ± 3.7, 168.9 ± 14.2, 141.8 ± 35.3, and 142.6 ± 27.3 beats/min, respectively. Time from the entrance into the yard to ejaculation (mating time; MT) was ranged from 30 to 2,103 sec and highly correlated to HRent (r=－0.82) and the time required for attaining HRmax after the entrance into the yard (dT HRmax) (r=0.87). Hct and serum alpha-ANP concentration significantly increased after ejaculation (60.0 ± 3.2%, P<0.0001 and 1.54 ± 0.61 ng/ml, P=0.0353), comparing to the baseline values (46.9 ± 4.4%, 1.40 ± 0.60 ng/ml). HRent and Hct was significantly higher in the stallions with MT less than 5 min (n=5), comparing to those (n=5) with MT more than 5 min (P=0.0324 and P=0.0082). The mating behavior increases a workload of heart in Thoroughbred stallions.

Mating Behavior Increases in Workload of Heart in Thoroughbred Stallions

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