Estrous and fertility responses of dairy ewes synchronized with combined short term GnRH, PGF2α and estradiol benzoate treatments

摘要: The objective of this study was to asses the effectiveness short term protocols (5–7 days) for synchronization oestrus in lactating ewes during non-breeding season, using combinations GnRH, PGF2 and estradiol benzoate treatments. One hundred six adult cross-bred Altamurana were divided into following treatment groups: (i) Group NT (N = 30), which served as control, exposed fertile rams a 20 days period; (ii) Fe 15) received FGA intravaginal sponges (14 + eCG i.m. (Day 14); (iii) GP GnRH agonist 0) 5) treatment; (iv) GPG 0), second dose 7) i.m.; (v) GPE 16) treated with (EB; Day 6, 24 h after PGF2) (vi) EPE EB treatment. Ewes checked hand mated rams. Upon return service again. A definite effect treatments on occurrence recorded, higher percentage (P < 0.01) exhibiting (93.3%) (100%) groups, compared (33.3%), (46.7%) (62.5%) groups. interval shorter more synchronized long group 0.01). fertility rates recorded 36.7% (11/30) or control ewes, 60.0% (9/15), 33.3% (5/15) 26.7% (4/15) (not significant) Fe, respectively. In prolificacy (80% 175%), than any other group, 10 16 exhibited oestrus, but rate significantly lower (20%, P 0.01), groups (GPG, 80%; GP, 71.4%; 64.3%). EPE, despite having highest (100%), none lambed. achieved all natural oestrous indicate that used do not seem interfere cycle their fertility. Results between studied, methods offer potential alternative conventional protocol (Fe) dairy ewes. Further research is required regarding use synchronize oestrus.