[en] The efficacy of eight combinations of fluorogestone acetate (FGA, 20 or 40 mg as intravaginal device during 11 days), equine chorionic gonadotropin (eCG, 300 or 500 UI injected 48 hr before FGA removal) and prostaglandin F2α (cloprostenol, 0 or 50 μg injected 48 hr before FGA removal) aiming at induction and synchronization of oestrus and ovulation was evaluated during the anoestrus season in spring and during the breeding season in autumn in adult Beni Arouss goats. Oestrous behaviour was recorded between 12 and 60 hr after FGA removal. Blood samplings allowing to assess onset of the pre-ovulatory LH surge and increase of progesterone as sign of an active corpus luteum were performed, respectively, between 20 and 60 hr and 3, 5, 8 and 15 days after FGA removal. No season-related differences (spring vs. autumn) were observed for oestrous response (95% vs. 93%), pre-ovulatory LH surge (94% vs. 84%) and luteal response after 3-8 and 11-15 days post-treatment (respectively 92% vs. 66% and 92% vs. 98%). The onset of oestrus (21 [13-53] vs. 32 [12-54] hr) and LH surge (26 [20-60] vs. 38 [22-60] hr) occurred significantly later in autumn. FGA (40 vs. 20 mg) in autumn significantly delayed the onset of oestrus (36 [16-54] vs. 23 [12-47] hr) and LH surge (44 [26-58] vs. 33 [22-60] hr). Significant treatment-related differences were recorded for onset of LH surge (earliest for 20 mg FGA, 300 IU eCG, 50 μg PGF2α ) and onset of luteal phase (latest for 40 mg FGA, 300 IU eCG, 50 μg PGF2α ). In conclusion, the hormone combinations tested appeared equally effective in terms of oestrous and ovulation rates. Season has influenced significantly the onset of oestrus and LH surge, and the high dose regimen of FGA delayed the ovarian response in autumn.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
El Kadili, Sara ; Integrated Veterinary Research Unit, Department of Veterinary Medicine, Faculty of Sciences, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium ; Department of Animal Production, Ecole Nationale d'Agriculture de Meknès, Meknes, Morocco
Raes, Marianne; Integrated Veterinary Research Unit, Department of Veterinary Medicine, Faculty of Sciences, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium
Bister, Jean-Loup; Integrated Veterinary Research Unit, Department of Veterinary Medicine, Faculty of Sciences, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium
Beckers, Jean-François ; Université de Liège - ULiège > Département des sciences fonctionnelles (DSF)
Amzati, Gaston; Integrated Veterinary Research Unit, Department of Veterinary Medicine, Faculty of Sciences, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium
Archa, Bouchaib; Department of Animal Production, Ecole Nationale d'Agriculture de Meknès, Meknes, Morocco
Chentouf, Mouad; Regional Center of Tangier, Institut National de la Recherche Agronomique, Tangier, Morocco
Kirschvink, Nathalie; Integrated Veterinary Research Unit, Department of Veterinary Medicine, Faculty of Sciences, Namur Research Institute for Life Sciences (NARILIS), University of Namur, Namur, Belgium
Language :
English
Title :
Evaluation of different hormonal treatments on oestral and ovarian responses in Moroccan Beni Arouss goats during anoestrus and breeding season.
ARES - Académie de Recherche et d'Enseignement Supérieur
Funding text :
This research was supported by the Belgian Academy for Research and Higher Education- Development Cooperation Committee (ARES-CCD). It was conducted at INRA, Regional Center of Tangier. The authors thank staff of this centre for their assistance with animal handling and care during experimentations.This research was supported by the Belgian Academy for Research and Higher Education‐ Development Cooperation Committee (ARES‐CCD). It was conducted at INRA, Regional Center of Tangier.
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