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Time of ovulation in nulliparous and multiparous goats
Simões, João; Baril, Gérard; Almeida, José Carlos; Azevedo, Jorge Manuel Teixeira de; Fontes, Paulo J.; Mascarenhas, R.Fifteen nulliparous and nine multiparous Serrana goats were used, through two successive oestrous cycles, in order to characterize their ovulation time with regard to the number of ovulations after induced and natural oestrus during the breeding season. The onset of oestrus was detected by the amount of vasectomized bucks after oestrus synchronization with prostaglandin, given 10 days apart, and in the followin...
Preovulatory LH peak and time of ovulation in nulliparous and primiparous goats...
Simões, João; Baril, Gérard; Cunha, Teresa; Azevedo, Jorge Manuel Teixeira de; Mascarenhas, RamiroThe aim of the present study was to determine the time of preovulatory LH peak and ovulation in anoestrous goats, after stimulation by male effect. Seven nulliparous and eight primiparous Serrana goats were isolated from bucks during nonbreeding season. Anoestrus was confirmed by circulating progesterone levels. A 6-day progestagen treatment (Chronogest® 45 mg FGA, Intervet, Holland) was performed to synchroniz...
Effect of eCG and progestagen on ovarian follicle population in goats
Ribeiro, Catarina; Teixeira, Victor; Mascarenhas, Ramiro; Baril, Gérard; Azevedo, Jorge Manuel Teixeira de; Simões, JoãoThe aim of present study was to evaluate the response of ovarian follicle population to eCG/progestagen treatment in goats. In second half of February, seven Serrana goats (G-eCG) received 250 UI of eCG (Intergonan®, Intervet, Holland) at the removal of intravaginal sponges impregnated with 20 mg of flugestone acetate (Chronogest® CR 20 mg, Intervet, Holland) and kept in place during 6 days. Six other Serrana g...
Lifespan of a luteinised ovarian cyst, hormonal profile and uterine ultrasonogr...
Simões, João; Baril, Gérard; Azevedo, Jorge Manuel Teixeira de; Mascarenhas, RamiroThe 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 vasec...
Oestrus and ovulatory response of goats with different parity to male effect an...
Simões, João; Baril, Gérard; Cunha, Teresa; Azevedo, Jorge Manuel Teixeira de; Teixeira, Victor; Ribeiro, Catarina; Mascarenhas, RamiroThe 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...
Assessment of luteal function by ultrasonographic appearance and measurement of...
Simões, João; Almeida, José Carlos; Baril, Gérard; Azevedo, Jorge Manuel Teixeira de; Fontes, Paulo J.; Mascarenhas, R.In order to characterize the evolution pattern of the corpora lutea (CL) and to compare luteal function with their ultrasonographic appearance, 37 estrous cycles of Serrana goats (n = 22) were studied during breeding season. A daily transrectal ultrasound scanning was performed through two successive estrous cycles. Both solid and fluid-filled CL were observed and measured in both ovaries of each goat. Addition...
Follicular dynamics in Serrana goats
Simões, João; Almeida, José Carlos; Valentim, Ramiro; Baril, Gérard; Azevedo, Jorge Manuel Teixeira de; Fontes, Paulo J.; Mascarenhas, RamiroTwenty-two Serrana goats were studied through two successive estrous cycles in order to characterize their follicular dynamics during the breeding season. The ovaries of the goats were scanned daily by realtime ultrasonography and all follicles ≥3mm were measured and classified. The data were classified by the number of follicular waves per goat to test the hypothesis that temporal and morphological differences...
Morphometry of ovarian structures by transrectal ultrasonography in Serrana goats
Simões, João; Potes, José; Azevedo, Jorge Manuel Teixeira de; Almeida, José Carlos; Fontes, Paulo J.; Baril, Gérard; Mascarenhas, R.The accuracy of transrectal real-time ultrasonography (RTU) scanning technique to detect ovarian structures (follicles and corpus luteum) of Serrana goats was compared to the data obtained by observation of ovarian sequential slices. This slicing technique (SLI) was considered as reference method. The laparoscopy and laparotomy techniques were also used for corpora lutea identification. For this purpose the ova...
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