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Estrus synchronization protocols for fixed-time artificial insemination (FTAI) during non-breeding season in ewes
Journal of Central European agriculture, 2024-01, Vol.25 (1), p.13-21
[Peer Reviewed Journal]
EISSN: 1332-9049 ;DOI: 10.5513/JCEA01/25.1.4116
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Title:
Estrus synchronization protocols for fixed-time artificial insemination (FTAI) during non-breeding season in ewes
Author:
Alexandru DEAC
;
Doru POP
;
Marius AIPĂTIOAIE
;
Adriana MUSCĂ
;
Ștefania MESEȘAN
;
Ileana MICLEA
;
Ioan LADOȘI
;
Marius ZĂHAN
Subjects:
ecg
;
estrus synchronization
;
fga
;
gnrh
;
melatonin
;
non-breeding season
Is Part Of:
Journal of Central European agriculture, 2024-01, Vol.25 (1), p.13-21
Description:
This study aimed to compare three protocols used for induction and estrus synchronization followed by fixed-time artificial insemination (FTAI) during the non-breeding season in anestrous Cluj Merino ewes. Estrus was synchronized in 80 healthy multiparous ewes using intravaginal sponges containing 20mg of fluorogestone acetate (FGA) for 14 days. Ewes were previously divided into three groups. At the time of sponge removal, ewes in groups II and III received a dose of 500 IU eCG, while those in Group I received a half dose, respectively 250 IU eCG, followed by the administration of 50 μg of GnRH 30 hours later. Ewes from Group III were previously implanted with subcutaneous mini-implants of melatonin, 20 days before progesterone (P4) treatment. We could not find significant differences in terms of reproductive performances between Group I and Group II, with results showing that Group I had a conception rate of 47.05%, which is lower than that of Group II (56.52%). However, there were significant differences (P < 0.05) between melatonin-supplemented Group III and Group I (63.33% vs. 47.05%). Thus, the potential substitution of eCG with GnRH still needs to be optimized, while supplementation with melatonin can increase the conception rate during the non-breeding season in anestrous ewes.
Publisher:
University of Zagreb, Faculty of Agriculture
Language:
Bulgarian
Identifier:
EISSN: 1332-9049
DOI: 10.5513/JCEA01/25.1.4116
Source:
ROAD: Directory of Open Access Scholarly Resources
DOAJ Directory of Open Access Journals
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