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Long interval prostaglandin-based treatment regimens do not affect ovulatory or prolificacy rates of multiparous ewes after cervical fixed timed AI
رژیم های درمانی مبتنی بر پروستاگلاندین با فاصله طولانی بر میزان تخمک گذاری یا ازدیاد میش های چندشاخ بعد از هوش مصنوعی به موقع دهانه رحم تأثیر نمی گذارد-2020 To evaluate effects of a longer, than conventional, interval between time of prostaglandin F2α
(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. Keywords: Prostaglandin | Fixed timed AI | Ovulation rate | Prolificacy | Conception | Ewe |
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