To evaluate effects of a longer, than conventional, interval between time of prostaglandin F_2α (PG)-based administrations in a PG-based treatment regimen for fixed timed AI (FTAI) on ovulation rate (OR), non-estrous return rate on Day 21 subsequent to the time of AI (NRR21), as well as conception, prolificacy and fecundity rates, ewes were assigned to two groups. Ewes of treatment group (PG15) were estrous-synchronized using two PG doses 15 days apart and FTAI was conducted at 56 h after the second PG administration (Day 0). Ewes of the Control group (SE) had imposed a pre-estrous synchrony treatment regimen with two PG doses 7 days apart and AI was conducted after detection of spontaneous estrus from 17 to 19 days after the second PG administration (Day 0). Ovulation rate on Day 8, NRR21, conception, prolificacy and fecundity rates on Day 60 were evaluated. There were no differences (P > 0.05) between ewes of the PG15 and SE groups in OR (1.47 ± 0.50 and 1.54 ± 0.50, respectively) or prolificacy (1.42 ± 0.80 and 1.33 ± 0.62, respectively), however, there were lesser values (P < 0.05) in the PG15 than SE group for NRR21 (65.2% and 91.3%, respectively), conception (59.8% and 91.3%, respectively) and fecundity (84.8% and 120%, respectively). The longer interval with the PG-based treatment regimen does not affect OR and prolificacy, but there is a lesser NRR21, conception and fecundity rate in comparison to ewes of the Control group.

评估前列腺素_F2α间隔时间比常规间隔更长（PG）的管理方式，采用基于PG的治疗方案，针对排卵率（OR），AI时间后第21天的非动情回报率（NRR21）以及受孕的固定时间AI（FTAI），繁殖率和繁殖率，母羊分为两组。使用相隔15天的两次PG剂量使治疗组（PG15）的母羊发情同步，并在第二次PG给药后第56小时（第0天）进行FTAI。对照组（SE）的母羊采用了两次发情间隔7天的PG剂量的动情前同步治疗方案，在第二次PG给药后第17天到19天（第0天）检测到自发性发情后进行了AI。评估第8天的排卵率，NRR21的排卵率，第60天的受精率和生殖力。没有差异（P > 0.05）在PG15的母羊和SE组OR（1.47±分别0.50和1.54±0.50，）或多产（分别为1.42±0.80和1.33±0.62）之间，然而，有更小的值（P  <  0.05） PG15高于SE组的NRR21（分别为65.2％和91.3％），受孕（分别为59.8％和91.3％）和生殖力（分别为84.8％和120％）。基于PG的治疗方案的间隔时间较长，不会影响OR和繁殖力，但与对照组的母羊相比，NRR21，受孕率和繁殖力均较小。