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Advisor(s)
Abstract(s)
A sazonalidade reprodutiva condiciona a gestão e a rentabilidade das explorações ovinas. Neste sentido, o controlo da actividade reprodutiva permite ajustar os ciclos de produção às necessidades do mercado e à disponibilidade de mão-de-obra. Importa pois conhecer, o melhor possível, a fisiologia da reprodução dos ovinos com que se trabalha, de modo a poder-se estabelecer as melhores estratégias reprodutivas e produtivas.
Este trabalho teve como principal objectivo estudar a eficácia do protocolo hormonal – PGF2α + Progestagénios (6 dias) + eCG – sobre o controlo da actividade reprodutiva de ovelhas Awassi x Sarda, quando aplicado no mês de Maio. Simultaneamente procurou-se avaliar os efeitos da aplicação de um tratamento prévio com melatonina exógena e comparar a eficácia de dois progestagénios – FGA vs. MAP – e a via de administração da PGF2α – intramuscular vs. subcutânea.
Concluiu-se que o protocolo estudado foi eficaz no controlo da actividade reprodutiva das ovelhas Awassi x Sarda. A melatonina exógena foi eficaz na interrupção do anestro sazonal, mas não melhorou a resposta reprodutiva das ovelhas ao protocolo aplicado. Os efeitos de ambos os progestagénios foram muito positivos. O MAP apenas foi superior ao FGA na promoção da resposta ovárica. Por seu turno, a administração subcutânea de PGF2α apenas favoreceu a percentagem de ovelhas que formaram, pelo menos, um CL.
Seasonality affects the management and profitability of sheep farms. Reproduction control allows adjusting the production cycles to market demands and labor availability. Knowing the physiology of reproduction is vital to establish the best reproductive and productive strategies. The main aim of this thesis was to assess the hormonal protocol - PGF2α + progestogens (5 days) + eCG – on the reproduction control of Awassi x Sarda sheep in April. At the same time the effects of a pre-treatment with exogenous melatonin, the effectiveness of two progestogens - FGA vs. MAP - and the route of PGF2α administration - intramuscular vs. subcutaneously - was evaluated. We concluded that the methodology applied was effective concerning controlling reproductive activity of Awassi x Sarda ewes. Exogenous melatonin it was efficient in seasonal anestrus interruption, but did not improved the reproductive response in this study. Both progestogens effects were very effective. MAP was greater than FGA at promoting ovarian response. In other hand PGF2α subcutaneous administration only promoted ewes percent who formed one corpus luteum.
Seasonality affects the management and profitability of sheep farms. Reproduction control allows adjusting the production cycles to market demands and labor availability. Knowing the physiology of reproduction is vital to establish the best reproductive and productive strategies. The main aim of this thesis was to assess the hormonal protocol - PGF2α + progestogens (5 days) + eCG – on the reproduction control of Awassi x Sarda sheep in April. At the same time the effects of a pre-treatment with exogenous melatonin, the effectiveness of two progestogens - FGA vs. MAP - and the route of PGF2α administration - intramuscular vs. subcutaneously - was evaluated. We concluded that the methodology applied was effective concerning controlling reproductive activity of Awassi x Sarda ewes. Exogenous melatonin it was efficient in seasonal anestrus interruption, but did not improved the reproductive response in this study. Both progestogens effects were very effective. MAP was greater than FGA at promoting ovarian response. In other hand PGF2α subcutaneous administration only promoted ewes percent who formed one corpus luteum.
Description
Keywords
Ovinos Awassi x Sarda Sincronização de cios PGF2α
Pedagogical Context
Citation
Mateus, Óscar; Dendena, Marina; Maurício, Raimundo; Correia, Teresa Montenegro; Valentim, Ramiro (2017). Controlo reprodutivo em ovelhas awassi x sarda. In Martins, Anabela (Coord.) IV Encontro de Investigadores do Instituto Politécnico de Bragança: livro de resumos. Bragança: Instituto Politécnico. ISBN 978-972-745-218-7
Publisher
Instituto Politécnico de Bragança