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1 Polish Journal of Veterinary Sciences

1 2000

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Lack of ovarian response in ageing cows to noradrenaline infused into the abdominal aorta

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Kotwica J. , Jaroszewski J. , Bogacki M.

Polish Journal of Veterinary Sciences

2000

tom 03

nr 4

A cannula was inserted into the aorta abdominalis through the coccygeal artery (cranial to the origin of the ovarian artery) in mature heifers (n=4) and in old cows (n=4) with reproductive disorders, to facilitate infusion of noradrenaline (NA; 4 mg/30 min) on day 10 of the oestrous cycle. Before, during and after NA jnfusion peripheral blood samples were collected for progesterone and oxytocin determination every 5-10 min. Each NA infusion stimulated (P < 0.01) secretion of both hormones in mature heifers. However, there were no hormonal response to NA treatment in ageing cows. In conclusion we assume that: (a) lack of ovary response to noradrenergic stimulation is involved in the reproductive disorders in the cow or (b) an ovary with disordered function does not respond to NA treatment, perhaps due to impairment of ß-adrenergic signalling system.