DCV - Resumo de Conferência em Revista Indexada

URI permanente para esta coleção:

Navegar

Entradas recentes

A mostrar 1 - 2 de 2
  • ItemAcesso Aberto
    Lifespan of a luteinised ovarian cyst, hormonal profile and uterine ultrasonographic appearance in a cyclic nulliparous Serrana goat
    2008 - Simões, João; Baril, Gérard; Azevedo, Jorge Manuel Teixeira de; Mascarenhas, Ramiro
    The genesis, evolving and spontaneous regression of a single luteinised ovarian cyst in a cyclic nulliparous Serrana goat, during the breeding season, were presented. Daily ovarian and uterus transrectal ultrasonography scanning was performed during two consecutive (induced and natural) oestrous cycles. Blood samples were collected every 4 h during the first 24 h after 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 first induced oestrus (with 50 µg of cloprostenol, IM), 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 20 mm in diameter, 16 days after induced oestrus. On 19th day, a natural oestrus with a LH peak (109.2 ng/ml) and ovulation was observed. Corpora lutea was visualized in presence of cyst that decreased to 5 mm on 10th day of the second oestrous cycle, when P4 levels reached 9.0 ng/ml. A heterogeneous ultrasonographic appearance of uterine horns was observed in presence of the cyst, but not during the dioestrus of the second oestrous cycle. This case showed the occurrence and spontaneous recovery of a luteinised ovarian cyst associated with low (subnormal) plasma P4 levels and heterogenic texture of uterus in a young cyclic goat.
  • ItemAcesso Restrito
    Oestrus and ovulatory response of goats with different parity to male effect and short-term progestagen treatment
    2008 - Simões, João; Baril, Gérard; Cunha, Teresa; Azevedo, Jorge Manuel Teixeira de; Teixeira, Victor; Ribeiro, Catarina; Mascarenhas, Ramiro
    The aim of this work was to determine the oestrous and ovulatory activity in goats with different parity after male effect associated to short-term progestagen treatments. In April, 15 nulliparous (NG; 25.2 ± 0.7 Kg) and 22 multiparous (MPG; 40.3 ± 0.7 Kg) Serrana goats were treated with 20 (NG20=7; MPG20=11), or 30 mg (NG30=8; MPG30=11) of fluorogestone acetate sponges (Chronogest® CR 20 mg / Chronogest® 30 mg, Intervet, Holland), starting 6 days before introduction of 3 active bucks in the flock (BI). Before treatment, all goats were anoestrous. Oestrous behaviour and mounting acceptance were evaluated, every 8 h, until 80 h after BI. Plasma LH levels were evaluated until 24h after onset of oestrus. Plasma progesterone (P4) was determined, twice weekly, from 2 months before until 10 days after BI. Sub-oestrus (silent ovulation) goats were considered when ovulation occurred without oestrous behaviour. No significative differences were found in percentage of oestrus and ovulatory activities between progestagen treatments (P > 0.05). Oestrous behaviour was observed in 26.7% (4/15) of NG and 68.2% (15/22; P = 0.01) in MPG. Sub-oestrus occurred in 53.3% (8/15) of NG and only in 13.6% (3/22; P < 0.01) of MPG. The percentage of ovulation was 90.9% (20/22) in NG and 80.0% (12/15; P > 0.05) in MPG. In conclusion, parity of females appears affect the oestrus behaviour response but not ovulation in goats exposed to male effect after progestagen treatments.