A. Trimeche et D. Tainturier, ECHOGRAPHIC STUDY OF POITOUS JENNIES FOLL ICULAR KINETICS DURING ESTRUS IN SPRING AND SUMMER, Revue de Medecine Veterinaire, 146(11), 1995, pp. 743-748
A daily ultrasonic examination of follicular growth during oestrus was
performed in 15 Poitou's jennies. During spring, the study showed tha
t 54,2% of females had an ovulation with a follicular size comprised b
etween 30 and 33 mm. However, during summer 48% of females had an ovul
ation with a follicular size greater than 36 mm. Consequently, artific
ial insemination in Poitou's jennies must begin at an optimal follicul
ar size of 30 mm in spring and 33 mm in summer.