engleski

Lifespan of a Luteinised Ovarian Cyst, Hormonal Profile and Uterine Ultrasonographic Appearance in a Cyclic Nulliparous Serrana Goat

The formation, evolvement and spontaneous regression of a single luteinised ovarian cyst in a cyclic nulliparous Serrana goat, during the breeding season, are presented. Daily ovarian and uterus transrectal ultrasonography scanning was performed during 2 consecutive (induced and natural) oestrus cycles. Blood samples were collected every 4h during the first 24h after the onset of each oestrus, detected by a vasectomised buck, in order to identify the timing of LH preovulatory peak. Plasma progesterone (p4) levels were also evaluated, twice a week, by RIA. After the first induced oestrus (with 50ug of cloprostenol), sexual behaviour and mount acceptance were observed, but the preovulatory LH peak and ovulation were not detected. The luteinisation of a persistent follicle was observed by ultrasonography and the plasma P4 levels increased from 0, 2 ng/mL to 2, 5 ng/mL. The ovarian cyst reached 20mm in diameter, 16 days after induced oestrus. On 19th day, a natural oestrus with a LH peak (109, 2ng/mL) and ovulation was observed. CLs were visualised in presence of the cyst that decreased to 5mm on 10th day of the 2nd oestrus cycle, when P4 levels reached 9ng/mL. A heterogeneous ultrasonographic appearance of uterine horns was observed in presence of the cyst, but not during the diestrous of the second oestrus cycle. This case showed the occurence and spontaneous recovery of a luteinised ovarian cyst associated with low (subnormal) plasma P4 levels and a heterogenic texture of the uterus ina young cyclic goat.

luteinised ovarian cyst; hormonal profile; uterine ultrasonographic appearance; nulliparous; goat

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