... the main, or the only, joining season in spring, just before transhumanceto the Alpine mountains in summer. In the experimental flock of the Domaine du Merle, M6rinos ... as the year of test, the age of ewes, the date of previous lambing, the number of lambs suckled, the live weight of ewes at the weaning period and just before the ... period in spring increases with the proportion of spontaneously cyclicewes before joining [18].Thus, the purpose of our study was to estimate the genetic parameters of spontaneous...