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OJVRTM
Online Journal of Veterinary
Research©
Volume 22 (4):315-321,
2018.
Effect of gonadotrophin-releasing
hormone given at insemination and 10 days later on reproductive performance and
progesterone levels in ewes.
Maythem Abdulealah Ismaeel1, Ziyad
Tariq Omer AL-Doori2
Departments of 1Medicine,
Surgery and Obstetrics and 2Public Health, School of
Veterinary Science, Tikrit
University, Iraq
.
ABSTRACT
Ismaeel MA, Omer AL-Doori ZT., Effect of gonadotrophin-releasing
hormone given at insemination and 10 days later on reproductive performance and
progesterone levels in ewes, Onl J Vet Res., 22 (4):315-321,
2018. Authors report effect of gonadotrophin-releasing hormone (GnRH)
on reproductive performance and serum progesterone in Nuaemie
ewes. Estrus was synchronized with intra vaginal sponges for 14 days and IM injection
of 400iu equine chorionic gonadotropin upon removal
of sponges. Fifteen ewes were injected IM 0.004mg GnRH at insemination and another
15 ewes at insemination, and 10 days later. Controls (22) were not treated. All
ewes were inseminated naturally. Compared with controls, lambing increased 126%,
fecundity 172%, and multiple birth rate 63% (P ≤ 0.05), in ewes given
GnRh twice. There were significant increases (P ≤ 0.05)
in serum progesterone at 10th day of pregnancy in ewes treated twice
with GnRH (9.71+1.19 ng/ml and 7.61+0.76 ng/ml progesterone, respectively)
compared with controls (3.91+0.44 ng/ml). In ewes given GnRH twice, progesterone
increased (P< 0.05) also by the 18th day of pregnancy compared
with those treated once or controls (4.85+1.46 ng/ml and 3.39+1.36 ng/ml respectively).
We find that GnRH given at mating and 10 days after was most effective.
Key
words: GNRH analogue, rate of lambing, fecundity,
progesterone concentration.
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