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Go backsubmitted by Patricia NAGNAN-LE MEILLOUR
Master 2 funded by French ANR (ASAP): Identification of odours involved in the male effect in sheep.
In sheep, reproduction occurs only
once a year, when the day length is decreasing in autumn. At any other moment,
males and females are sexually quiescent. Induction of ovulation in sexually
quiescent females by exposure to a sexually active male is known as the “ram
effect” (or male effect). A complete reproductive response can be induced by
exposure to ram fleece alone, even if in fewer ewes and with different
neuroendocrine modalities. The molecules involved in the male effect have not
yet been identified.
One of the goals of the “PHEROMALE”
project financed by French ANR is to identify these compounds. Fleece has been collected
from the same male, at sexually active period (November) and sexually inactive
period (may). Comparison of samples coming from the same male contributes to
reduce inter-individual variability. Compounds will be extracted from fleece
and identified by gas chromatography coupled to mass spectrometry (GC-MS).
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