02781naa a2200409 a 450000100080000000500110000800800410001902400620006010000200012224501990014226000090034152015210035065000240187165000110189565000160190665000180192265000270194065000090196765000170197665000140199365000110200765000150201865000240203365300220205765300220207965300190210165300250212065300340214565300210217970000170220070000270221770000230224470000160226770000200228370000220230377300460232521333482021-08-19       2020    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1016/j.theriogenology.2019.11.0042DOI1 aFIGUEIRA, L. M.  aPreovulatory follicular dynamics, ovulatory response and embryo yield in Lacaune ewes subjected to synchronous estrus induction protocols and non-surgical embryo recovery.h[electronic resource]  c2020  aAbstract: The objective of this study was to assess the effect of the duration of progesterone-based estrus induction protocols on preovulatory follicular dynamics, ovulatory response, and embryo yield after non-surgical embryo recovery (NSER) in Lacaune ewes. Females received acetate medroxyprogesterone intravaginal sponges for six (G-6; n = 14) or nine (G-9; n = 14) days plus d-cloprostenol and eCG 24 h before sponge removal (Day 0). Preovulatory follicular dynamics and the luteal characteristics are evaluated by B-mode and Color-Doppler ultrasonography. NSER was performed five to six days after ovulation. The estrous behavior rate was 85.7% for both groups, and the percentage of ewes that ovulated was 92.9% in G-6 and 100% in G-9. The day of wave emergence (relative to Day 0) did not differ (P &gt 0.05) between G-6 (-3.0 ± 0.5) and G-9 (-4.2 ± 0.5). The number of follicles of size 4.1-5.0 mm was higher (P &lt 0.05) in G-9 (1.4 ± 0.2) compared to G-6 (0.8 ± 0.2) during the Days -4 to 0. At NSER, the transcervical penetration rate was 95.2% (20/21) and its duration time was lower (P &lt 0.05) in G-9 (3.4 ± 0.6 min) than in G-6 (7.2 ± 1.3 min). The number of ovulations and viable embryos was higher (P &lt 0.05) in G-9 (2.9 ± 0.3 and 1.3 ± 0.4, respectively) than in G-6 (1.9 ± 0.3 and 0.4 ± 0.2, respectively). In conclusion, the 9-day protocol promoted higher ovulation rate and embryo yield; moreover, the cervical dilation treatment allowed NSER in a high percentage of Lacaune ewes.  aAnimal reproduction  aBrazil  aDairy sheep  aEstrous cycle  aEstrus synchronization  aEwes  aCiclo Estral  aIndução  aOvelha  aOvulação  aReprodução Animal  aCervical dilation  aInduced ovulation  aOvino leiteiro  aResposta ovulatória  aTranscervical embryo recovery  aUterine flushing1 aALVES, N. G.1 aSOUZA-FABJAN, J. M. G.1 aOLIVEIRA, M. E. F.1 aLIMA, R. R.1 aSOUZA, G. N. de1 aFONSECA, J. F. da  tTheriogenologygv. 145, p. 238-246, 2020.