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26340

Impacts of GnRH, PMSG and hCG treatments on follicular diameter, conception and lambing rates of Egyptian ewe lambs using intravaginal sponges

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Last updated: 03 Jan 2025

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Abstract

The influence of gonadotropin releasing hormone (GnRH), Pregnant Mare Serum
Gonadotropin (PMSG) and human Chronic Gonadotropin (hCG) on some reproductive responses of
Egyptian ewe lambs was evaluated. Twenty five animals (aged 8 – 12 months and weighed 27 - 33
Kg) were divided into 5 groups (5 ewe lambs each). Group (1) served as a control, Group (2), received
vaginal sponges impregnated with MAP (60 mg medroxy progesterone acetate) for 14 days, during
these period, animals fed 3 kg Berseem (Trifolium alexandrinum) plus 500 gm concentrate/head/day.
Group (3), received vaginal sponges impregnated with (60 mg, MAP) for 14 days, on the day of
sponge removal; each animal injected by PMSG (250 IU, I/M). Group (4) animals received 1.25 ml
Receptal (0.5 μg, GnRH) I/M, on day 0, Seven days later, ewe lambs injected with 0.5 ml Estromate
(125 μg. PGF2α) I/M, after 48 hours, animals treated with the second dose of GnRH. Group (5)
received two injections of 0.5 ml Estromate on days 0 and 7, respectively, after 72 hours from the
second dose of PGF2α ewe lambs were injected 0.2 ml hCG. Heat detection was performed and transrectal
ultrasound scanning also performed to confirm estrus, pregnancy and follicular diameter. The
results revealed that, administration of PMSG (group 3) reduced the interval to estrus (the onset of heat
/hours) significantly (p< 0.01) compared with control and other groups. Regarding conception and
lambing rates, group 2, 3, & 4 had significantly (P˂ 0.01) affected than group 1 & 5. Follicular
diameter (mm) tended to increase significantly in treated groups than the control one. Non-significant
change was observed among groups in gestation period, while group 3 showed an increase in lamb's
weight than the other treatments. Results suggest that, tested hormones have effect on selected
reproductive responses in Egyptian ewe lambs while administration of PMCG (Group 3) has the best
response compared to other hormonal treatments.

DOI

10.21608/ejsgs.2016.26340

Authors

First Name

Daghash.

Last Name

H

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Affiliation

Faculty of Agriculture, Department of Animal production, Assiut University.

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First Name

S.

Last Name

Fahmy

MiddleName

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Affiliation

Faculty of Agriculture, Department of Animal Production, El-Azhar University.

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Orcid

-

First Name

T.

Last Name

Hassan

MiddleName

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Affiliation

Animal Reproduction Research Institute (ARRI), AL-Ahram, Giza, Egypt.

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City

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Orcid

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First Name

M.

Last Name

Ali

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Affiliation

Faculty of Agriculture, Department of Animal Production, El-Azhar University.

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Volume

11

Article Issue

3

Related Issue

4743

Issue Date

2016-12-01

Receive Date

2019-01-31

Publish Date

2016-12-01

Page Start

1

Page End

1

Print ISSN

2090-0386

Online ISSN

2090-0376

Link

https://ejsgs.journals.ekb.eg/article_26340.html

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https://ejsgs.journals.ekb.eg/service?article_code=26340

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Original Article

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728

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Journal

Publication Title

Egyptian Journal of Sheep and Goats Sciences

Publication Link

https://ejsgs.journals.ekb.eg/

MainTitle

Impacts of GnRH, PMSG and hCG treatments on follicular diameter, conception and lambing rates of Egyptian ewe lambs using intravaginal sponges

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Article

Created At

22 Jan 2023