Abstract
The objective of this work was to demonstrate the effects of exogenous injectable progesterone on protocols of induction and estrus cycle synchronization in sheep. The production of these animals has shown to be increasing in the state of Bahia, impelling the need for new techniques applied to reproductive management to raise the rate of productivity of the herds. Thus, two hormonal protocols of short duration were conducted in 17 Santa Inês breeders. Two groups were submitted to combination of Progesterone Injection, Equine Chorionic Gonadotrophin(eCG) and Clorprostenol Sodium as precursor of Prostaglandin 2α(PGF2α), differing in doses and application interval. The results obtained in relation to estrus presentation were not significant, since parity indexes had a negative influence after the protocol.
Highlights
The objective of this work was to demonstrate the effects of exogenous injectable progesterone on protocols of induction and estrus cycle synchronization in sheep
Two groups were submitted to combination of Progesterone Injection, Equine Chorionic Gonadotrophin(eCG) and Clorprostenol Sodium as precursor of Prostaglandin 2α(PGF2α), differing in doses and application interval
The results obtained in relation to estrus presentation were not significant, since parity indexes had a negative influence after the protocol
Summary
Os protocolos de sincronizações foram conduzidos em uma propriedade rural selecionadora de ovinos Santa Inês, no município de Camaçari, Bahia (12°41' 51"sul 38°19' 27" oeste). Houve aplicação de vacina contra clostridioses, Excell 10®, de forma, que os animais foram vacinados aos 30 e 60 dias de vida, recebendo reforço anual. A seleção das matrizes para a aplicação do protocolo hormonal foi realizada através de histórico, avaliação clínica e ultrassonografia do sistema reprodutivo, realizada com o aparelho da Pie Medical Aquila ®, por via transretal e frequência de 6 MHz. Foram submetidas a seleção 27 matrizes sendo afastadas 8 fêmeas por motivo de prenhez e 1 fêmea com imagem ultrassonográfica sugestiva de reabsorção embrionária. O protocolo A1, obteve duração de cinco dias de forma que no dia 0 foi administrada P4-300 - Progesterona na dose de 1,0 ml (300 mg) por animal e no dia 5 foi aplicado Novormon (ECG) na dose de 1,4 ml (280 UI) e Ciosin (Cloprostenol Sódico) na dose de - 0,6 ml (0,150 mg) por animal. As respostas em relação ao efeito da progesterona no cio foram analisadas pelo teste de MannWhitney de significância (P >0,05), já o efeito do protocolo na prenhez foi submetido ao teste quiquadrado de significância (P < 0,05)
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