Browsing by Author "Velasco, Helena"
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- Administración de diferentes dosis de eCG en la sincronización del celo en cabras de raza Serrana al principio de la estación reproductivaPublication . Correia, Teresa Montenegro; Azevedo, Jorge; Valentim, Ramiro; Simões, João; Galvão, Lurdes; Fontes, Paulo; Mendonça, Álvaro; Velasco, Helena; Maurício, Raimundo; Cardoso, Manuel; Medeiros, SandraEste trabajo tuvo como objetivo estudiar los efectos de la administración de dos dosis diferentes de eCG - 300 UI o 500 UI -, en el ámbito de un tratamiento de sincronización del celo, aplicado a cabras de la raza Serrana, ecotipo Transmontano, en el inicio de la estación reproductiva. De acuerdo con los resultados alcanzados, la respuesta reproductiva de las cabras estudiadas no varió significativamente en función de la dosis de eCG utilizada.
- Anticipación de la estación reproductiva en ovejas de la raza Churra Galega Bragançana. Inseminación artificialPublication . Valentim, Ramiro; Fernandes, Mónica; Azevedo, Jorge; Mendonça, Álvaro; Almeida, José Carlos; Velasco, Helena; Simões, João; Fontes, Paulo; Maurício, Raimundo; Cardoso, Manuel; Correia, Teresa MontenegroEste trabajo tuvo como principal objetivo evaluar la eficacia de la aplicación de dos tratamientos hormonales distintos en la anticipación de la estación reproductiva – progestágenos + eCG vs. melatonina + progestágenos + eCG –, en ovejas de la raza Churra Galega Bragançana. Adicionalmente, por primera vez en esta raza portuguesa, se valoró el uso de la técnica de inseminación artificial (IA) cervical en relación a la monta natural (MN). De acuerdo con los resultados alcanzados, a finales del invierno, 89,7% de las ovejas estudiadas estaban en anestro estacional. El tratamiento con melatonina determinó, comparado con el tratamiento clásico con progestágenos y eCG, un incremento de los porcentajes de ovejas que presentaron celo y que resultaron gestantes. Cerca del 77,5% de las ovejas cubiertas por monta natural quedaron gestantes. Lo mismo ocurrió con 55,0% de las ovejas inseminadas artificialmente.
- Anticipación de la estación reproductiva en ovejas de la raza Churra Galega Bragançana. Inseminación artificialPublication . Valentim, Ramiro; Fernandes, Mónica; Azevedo, Jorge; Mendonça, Álvaro; Almeida, José Carlos; Velasco, Helena; Simões, João; Fontes, Paulo; Maurício, Raimundo; Cardoso, Manuel; Correia, Teresa MontenegroEste trabajo tuvo como principal objetivo evaluar la eficacia de la aplicación de dos tratamientos hormonales distintos en la anticipación de la estación reproductiva – progestágenos + eCG vs. melatonina + progestágenos + eCG –, en ovejas de la raza Churra Galega Bragançana. Adicionalmente, por primera vez en esta raza portuguesa, se valoró el uso de la técnica de inseminación artificial (IA) cervical en relación a la monta natural (MN). De acuerdo con los resultados alcanzados, a finales del invierno, 89,7% de las ovejas estudiadas estaban en anestro estacional. El tratamiento con melatonina determinó, comparado con el tratamiento clásico con progestágenos y eCG, un incremento de los porcentajes de ovejas que presentaron celo y que resultaron gestantes. Cerca del 77,5% de las ovejas cubiertas por monta natural quedaron gestantes. Lo mismo ocurrió con 55,0% de las ovejas inseminadas artificialmente.
- Aplicación de tratamientos con diferentes duraciones en el control de la actividad ovárica de cabras de raza SerranaPublication . Correia, Teresa Montenegro; Azevedo, Jorge; Simões, João; Galvão, Lurdes; Fontes, Paulo; Mendonça, Álvaro; Almeida, José Carlos; Velasco, Helena; Maurício, Raimundo; Cardoso, Manuel; Valentim, RamiroEste trabajo tuvo como objetivo estudiar los efectos de la aplicación de dos tratamientos progestativos, con diferentes duraciones –largo (12 días) y corto (5 días)–, en el control de la actividad ovárica de cabras de la raza Serrana, ecotipo Transmontano. De acuerdo con los resultados alcanzados, a finales de Abril, las cabras Serranas seguían en anestro estacional. La aplicación del tratamiento corto determinó, con relación al tratamiento largo, un mejor comienzo de la actividad reproductiva.
- Effects of PGF 2alfa administration at the onset on the end of a short-term progestagen tratment in serrana goats.Publication . Correia, Teresa Montenegro; Azevedo, Jorge; Mendonça, Álvaro; Fontes, Paulo; Galvão, Lurdes; Cardoso, Manuel; Velasco, Helena; Maurício, Raimundo; Valentim, RamiroThe control of the reproduction activity plays an essential role in modern animal production systems allowing higher management flexibility and profitability. Short-term progestagens treatments are becoming increasingly popular. Nevertheless the best moment to administrate Prostaglandin F2a (PGF2a) is still in debate. The current study aims to assess the reproductive effects of PGF2a injected at the onset or the end of a short-term progestagen treatment in Portuguese Serrana goats.
- Effects of PGF(2A) administration at the onset or the end of a short-term progestagen treatment in Serrana goatsPublication . Correia, Teresa Montenegro; Azevedo, Jorge; Mendonça, Álvaro; Fontes, Paulo; Galvão, Lurdes; Cardoso, Manuel; Velasco, Helena; Maurício, Raimundo; Valentim, RamiroIn order to assess the reproductive effects of Prostaglandin F2alfa (PGF2alfa) administration at the onset or the end of a progestagen treatment in Portuguese Serrana goats, an initial group of 44 females (5 were later rejected for several reasons) aged between 3 and 7 years was used. In May (beginning of the breeding season), all goats were treated with an intravaginal sponge impregnated with 20 mg of fluorogestone acetate (FGA) for 5 days and injected (i.m.) with 300 UI of eCG at sponge removal time. Half goats received an injection (i.m.) of 100 ug of cloprostenol at sponge insertion time (SI) and the other half at sponge removal time (SR). Blood samples were taken for progesterone determination and 4 intact bucks with harness marker were used to identify the estrus. A transrectal ultrasound scanning was performed for pregnancy diagnosis 41 days after eCG administration. PGF2alfa injection at the onset of the FGA treatment had a positive effect in estrus (SI – 100.0% vs. SR – 90.9%; Chi2 = 9.424; P<0.01), ovulation (SI – 100.0% vs. SR – 95.5%; Chi2 = 4.082; P<0.01) and pregnancy (SI – 100.0% vs. SR – 90.9%; Chi2 = 9.424; P<0.01) and fertility (SI – 100.0% vs. SR – 72.7%; Chi2 = 31.214; P<0.001) rates. Time of PGF2alfa injection just had no significant effect in prolificacy (SI – 2.1 ± 0.8 vs. SR – 2.2 ± 0.8; P>0.05). In conclusion, data indicate that PGF2alfa should be administrated at the onset of the FGA treatment.
- Hormonal control of the breeding activity in Churra Galega Bragançana ewesPublication . Correia, Teresa Montenegro; Azevedo, Jorge; Mendonça, Álvaro; Maurício, Raimundo; Cardoso, Manuel; Velasco, Helena; Quintas, Helder; Fontes, Paulo; Simões, João; Barbosa, Larissa; Valentim, RamiroThis study aimed to evaluate the efficiency of different hormonal treatments to control the breeding activity in Churra Galega Bragançana (CGB) ewes. Material and Methods This experiment took place at Bragança (latitude 41° 49' N, longitude 6° 40' W, altitude 720 meters) and involved 94 adult CGB ewes. At March 9, 25 ewes received a melatonin implant (18 mg) – Melatonin. Forty-five days later a vaginal sponge with 20 mg of FGA was inserted in all ewes. FGA treatment lasted for 12 days. Twenty-four hours before sponge removal 32 non-melatonin treated ewes were injected with 500 UI of eCG (D-1). At sponge removal melatonin ewes and all remaining non-melatonin ewes (n = 37; Control) were injected with 500 UI of eCG. Heat detection was performed by 5 intact rams provided with harness markers. Ovarian activity was assessed by progesterone (P4) plasmatic levels 2 weeks before melatonin and FGA treatments and for 5 days after sponge removal. Pregnancy diagnosis was performed 41 days after sponge withdraws by ultrasonography. Results In the fortnight prior to melatonin treatment 74.5% of all ewes had high plasmatic levels of P4 (> 0.5 ng/ml). In the previous 2 weeks to FGA treatment 80.0% of Melatonin and 56.5% of non-melatonin treated ewes had high levels of P4 (Chi-square = 13.2; P≤0.001). About 76.6% of all ewes showed heat. Around 83.3% were Control and 76.0% Melatonin ewes (Chi-square = 2.0; P>0.05). Time at eCG injection affected the percentage of ewes in heat: Control (83.3%) vs. D-1 (71.9%) ewes (Chi-square = 4.2; P≤0.05). Over 98.6% of all ewes had high levels of P4, 1 to 5 days post sponge withdraws. About 97.3% were Control and 100.0% Melatonin ewes (Chi-square = 3.0; P>0.05). Time at eCG injection had no influence in the percentage of ewes with high levels of P4: Control (97.3%) vs. D-1 (100.0%) ewes (Chi-square = 3.0; P>0.05). Forty-one days after sponge removal, only 41.5% of all ewes were pregnant. About 45.9% were Control and 48.0% Melatonin ewes (Chi-square = 0.1; P>0.05). Fertility rate was higher in Control (45.9%) than in D-1 (31.3%) ewes (Chi-square = 4.8; P≤0.05). Conclusions – Initially 74.5% of all ewes presented high plasmatic levels of P4 (> 0.5 ng/ml). – Melatonin enhanced the percentage of ewes with high levels of P4 prior to FGA treatment. – Melatonin had no effect in post FGA near breeding activity. – Preceding in 24 hours the eCG administration had negative impact in sexual behavior and fertility rate. – Fertility rates were fairly poor.
- Interrupção do anestro sazonal em ovelhas da Raça Churra Galega BragançanaPublication . Correia, Teresa Montenegro; Azevedo, Jorge; Mendonça, Álvaro; Fontes, Paulo; Velasco, Helena; Simões, João; Maurício, Raimundo; Cardoso, Manuel; Barbosa, Larissa; Valentim, RamiroEste ensaio foi realizado com o intuito de comparar a eficácia de dois tratamentos hormonais distintos na interrupção do anestro sazonal – FGA + eCG (Grupo Controlo) vs. Melatonina + FGA + eCG (Grupo Melatonina) –, em ovelhas da raça Churra Galega Bragançana. Adicionalmente, procurou-se avaliar os efeitos da administração de duas doses diferentes de eCG – 500 UI ou 750 UI. Foram utilizadas 40 ovelhas da raça Churra Galega Bragançana do rebanho experimental do IPB-ESA (Bragança, Portugal), com idades compreendidas entre os 2-6 anos. A 24 de Março, estas ovelhas foram aleatoriamente divididas em dois grupos – Controlo (n = 20) e Melatonina (n = 20). Às ovelhas do grupo Melatonina foi colocado um implante subcutâneo de melatonina (18 mg). Quarenta e quatro dias mais tarde, as ovelhas dos dois grupos – Controlo e Melatonina – foram tratadas com esponjas vaginais impregnadas com 20 mg de FGA. O tratamento progestagénico teve uma duração de 12 dias. Quando da remoção das esponjas vaginais, as ovelhas de ambos os grupos foram aleatoriamente divididas em dois sub-grupos: metade foi tratada com 500 UI de eCG/ovelha e a outra metade com 750 UI de eCG/ovelha. Nessa altura, foram introduzidos no rebanho 3 carneiros adultos munidos de arneses marcadores (cobrição e detecção de cios). A actividade ovárica das ovelhas foi avaliada através do doseamento dos níveis plasmáticos de progesterona. O diagnóstico de gestação realizou-se 41 dias após a administração de eCG, por ultrasonografia em tempo real. Em meados de Março, 80,0% das ovelhas estudadas estavam em anestro sazonal. Nos finais de Abril - inícios de Maio, esta percentagem era de 55,0%. Os tratamentos FGA + eCG determinaram uma excelente resposta reprodutiva. A administração prévia de melatonina exógena não produziu qualquer efeito reprodutivo significativo. A dose de eCG empregue também não afectou significativamente os vários parâmetros reprodutivos avaliados.
- Male effect in Churra Galega Bragançana and Suffolk ewes under long-day artificial photoperiodPublication . Azevedo, Jorge; Correia, Teresa Montenegro; Valentim, Ramiro; Almeida, José Carlos; Simões, João; Galvão, Lurdes; Velasco, Helena; Maurício, Raimundo; Fontes, Paulo; Mendonça, Álvaro; Cardoso, ManuelThis study aimed to evaluate the male effect in Churra Galega Bragançana (CGB) and Suffolk (S) ewes under artificial long-day photoperiod (16L:8D). On March 21st, 34 CGB and 27 S ewes, 2-5 years old, were allocated in light control facilities. Two months later, ovarian activity was registered by progesterone concentrations in blood plasma twice weekly. Ovarian activity was controlled by vaginal sponges (FGA). Vasectomised aproned rams were used to induce ram effect and estrus detection. Ewes were observed for estrus twice daily. Ewes presenting ovarian activity were identified by endoscopy. Chi-square tests were performed to compare proportions and Student’s t-tests to compare means of the ovulation rate. After 2 months in 16L:8D photoperiod, 81.5% of Suffolk and 64.7% of CGB ewes were in anestrous (P≤0.01). Male effect was influenced by breed (S vs. CGB) – Estrus: 50.0% vs. 75.0% (P≤0.001) and Ovulation: 18.2% vs. 63.6% (P≤0.001) –, except for ovulation rate (1.0±0.0). Data suggests that male effect is more effective in CGB than in Suffolk ewes.
- Mobile application development for human veterinary resources management in a low density population context: promoting students engagement by working with the communityPublication . Matos, Paulo; Velasco, Helena; Gonçalves, JoséThis paper describes a mobile application, developed in an educational context, by the students of the Degree in Computer Engineering of the Instituto Politécnico de Bragança, allowing them to develop skills, based on real-world community problems solving, promoting by this way its engagement, and, at the same time, provide a solution to an effective need of the local community. The developed application has as goal to support the Human Veterinary Resources Management in a Low Density Population Context.