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Title: Male effect in Churra Galega Bragançana and Suffolk ewes under long-day artificial photoperiod
Authors: Azevedo, Jorge Manuel Teixeira de
Correia, Teresa Montenegro
Valentim, Ramiro
Almeida, José Carlos
Simões, João
Galvão, Lurdes
Velasco, Helena
Maurício, Raimundo
Fontes, Paulo J.
Álvaro, Mendonça
Cardoso, Manuel
Issue Date: 2007
Publisher: European Federation of animal Science (EAAP)
Abstract: This 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
Peer Reviewed: yes
ISBN: 978-90-8686-045-6
Document Type: Other
Appears in Collections:OLD - DZOO - Resumo de Comunicação em Conferência Internacional

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