Catecholamine levels in the blood plasma of ewes in the oestrus period during superovulation
1992
Pastorova, B. | Varady, J. (Vysoka Skola Veterinarska, Kosice (CSFR))
The effects of a serum gonadotropin (SG) superovulation hormonal preparation were investigated on catecholamine levels (norepinephrine, dopamine and epinephrine) in the blood plasma of ewes with synchronized oestrus period. Superovulation was induced by an i.m. administration of 1500 IU SG as soon as oestrus synchronization with Agelin vaginal tampons finished. Catecholamines were detected in the blood plasma before synchronization, on the day of Agelin vaginal tampons application, and in 48 and 72 hours after the hormone administration - on the days of the expected ovulation. The results indicate that synchronization and hormonal stimulation influence plasma catecholamine levels. The norepinephrine (NE) concentration in the blood plasma of the control samples has the value of 8.31 +/- 0.732 pmol/ml. On the day of the expected ovulation the NE concentrations rose to 17.12 +/- 1.289 pmol/ml and they remained significantly increased at the level of 12.89 +/- 1.020 pmol/ml on the following day of the experiment. The dopamine level (DA) in the plasma of a control sample is 6.42 +/- 0.350 pmol/ml. The DA level increased to 12.53 +/- 1.021 pmol/ml in 48 hours after SG administration and it decreased to the control values (6.32 +/- 0.480 pmol/ml) on the following day. The E control level is 13.53 +/- 1.082 pmol/ml. The E level increased to 24.01 +/- 1.328 after the application of Agelin vaginal tampons. In comparison with the control samples, the E levels in the blood plasma of ewes did not vary during ovulation, or they were insignificantly decreasing.
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