Effect of eCG in a short-term synchronization treatment on ovarian status, estrus synchrony, and ovulation in dairy goats managed under tropical conditions.
Does
Gonadotropin
Hormone
Multiparous
Nulliparous
Reproduction
Journal
Tropical animal health and production
ISSN: 1573-7438
Titre abrégé: Trop Anim Health Prod
Pays: United States
ID NLM: 1277355
Informations de publication
Date de publication:
05 Apr 2021
05 Apr 2021
Historique:
received:
02
02
2021
accepted:
29
03
2021
entrez:
6
4
2021
pubmed:
7
4
2021
medline:
25
6
2021
Statut:
epublish
Résumé
The aim of this study was to assess the need of using eCG on short-term estrus synchronization protocol in nulliparous (NUL) and multiparous (MULT) dairy goats during the breeding season. Alpine (n = 20), Nubian (n = 20), and Saanen (n = 16) goats received 60 mg medroxyprogesterone acetate intravaginal sponges for 6 days plus 30 μg d-cloprostenol and 200 IU eCG (G-eCG, n = 28) or saline (G-Control, n = 28) 24 h before sponge removal. The NUL and MULT goats of each breed were equally assigned into the two treatments. Transrectal ultrasonography was used to evaluate ovulatory parameters, and teaser goats were used for estrus detection every 12 h from sponge removal to ovulation. eCG did not affect (P > 0.05) estrus response (~86%), diameter of ovulatory follicles (~6.8 mm), and number of ovulations (~1.6). Nevertheless, eCG led to earlier (P < 0.05) ovulation (G-eCG = 65.1 and G-Control = 73.2 h) and increased (P < 0.05) the ovulation rate (G-eCG = 96.4% and G-Control = 67.9%). In the absence of eCG, no differences regarding reproductive parameters (P > 0.05) were found between parity orders. Alpine MULT goats underwent a superior (P < 0.05) number of ovulations (2.2) in comparison to NUL goats (1.3). In conclusion, the exclusion of eCG from short-term estrus synchronization protocol did not interfere with estrus response but decreased the ovulation rate.
Identifiants
pubmed: 33821404
doi: 10.1007/s11250-021-02699-y
pii: 10.1007/s11250-021-02699-y
doi:
Substances chimiques
Progesterone
4G7DS2Q64Y
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
246Subventions
Organisme : Empresa Brasileira de Pesquisa Agropecuária
ID : 20.19.01.004.00.03.001
Organisme : Conselho Nacional de Desenvolvimento Científico e Tecnológico
ID : 314952/2018-7
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