The effect of gonadotropin-releasing hormone or human chorionic gonadotropin administration at mating on lambing performance in konya merino yearling ewes
<b>Aim:</b> In this study, it was aimed to determine the effects of the exogenous gonadotropin-releasing hormone (GnRH) or human chorionic gonadotropin (hCG) application at mating on lambing performance in synchronization and following cycle in Konya Merino yearling ewes.<p> <b&...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Selcuk University Press
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| Series: | Eurasian Journal of Veterinary Sciences |
| Subjects: | |
| Online Access: | http://eurasianjvetsci.org/pdf.php3?id=884 |
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| Summary: | <b>Aim:</b> In this study, it was aimed to determine the effects of
the exogenous gonadotropin-releasing hormone (GnRH) or
human chorionic gonadotropin (hCG) application at mating
on lambing performance in synchronization and following
cycle in Konya Merino yearling ewes.<p>
<b>Materials and Methods:</b> Thirty six yearling Merino ewes,
aging 16-20 months, were used as material. Estrus of
ewes was synchronized with 4 μg GnRH on d 0 and 150
μg prostaglandinF2α (PGF2α) on day 5, intramuscularly. After
PGF2α injection, the ewes detected to be in estrus were
mated with a ram, whose fertility was known previously,
and they were divided into three groups. Group I (n=14)
were injected 200 IU hCG, Group II (n=12) were injected 4
μg GnRH, and Group III (control group, n=10) were injected
1 mL placebo at mating. Pregnancy was diagnosed on day
30 by using transrectal ultrasonography.<p>
<b>Results:</b> In the present study, pregnancy, birth, twinning
rate and lambing performance were 85.71%, 85.71%,
33.3% and 1.14 in hCG group, 75.0%, 66.67%, 12.5%, and
0.75 in GnRH group, and 100%, 80%, 37.5% and 1.10 in
control group, respectively. There was no significant difference
among groups for lambing performance and studied
reproductive parameters (p>0.05).<p>
<b>Conclusion:</b> In conclusion, the injection of GnRH or hCG in
Merino ewes at mating was not effective on lambing performance. |
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| ISSN: | 1309-6958 2146-1953 |