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Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons

Follicle development in post-weaning sows is influenced by various factors. To control ovulation time using hormone, factors that influence ovulation should be investigated. The present study was performed to evaluate the effect of GnRH (buserelin) administration in relation to season and sow parame...

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Autores principales: PEARODWONG, Pachara, TRETIPSKUL, Chanyuth, SOEDE, Nicoline M., TUMMARUK, Padet
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Japanese Society of Veterinary Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6895621/
https://www.ncbi.nlm.nih.gov/pubmed/31527339
http://dx.doi.org/10.1292/jvms.18-0429
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author PEARODWONG, Pachara
TRETIPSKUL, Chanyuth
SOEDE, Nicoline M.
TUMMARUK, Padet
author_facet PEARODWONG, Pachara
TRETIPSKUL, Chanyuth
SOEDE, Nicoline M.
TUMMARUK, Padet
author_sort PEARODWONG, Pachara
collection PubMed
description Follicle development in post-weaning sows is influenced by various factors. To control ovulation time using hormone, factors that influence ovulation should be investigated. The present study was performed to evaluate the effect of GnRH (buserelin) administration in relation to season and sow parameters on ovulation time in weaned sows. Seventy-seven weaned sows were divided into the following groups: control (hot season, n=21; cool season, n=16) and treatment (hot season, n=22; cool season, n=18). Sows were kept in a close house equipped with an evaporative cooling system. Ovulation time was determined every 6 hr using transrectal ultrasonography. Administration of 10 µg buserelin at 72 hr after weaning affected estrus-to-ovulation interval (EOI) and weaning-to-ovulation interval (WOI) in sows (P<0.05). The percentage of sows that ovulated between 44–56 hr after injection was higher in the cool season than in hot season (P<0.05). Weaning-to-estrus interval (WEI) and injection-to-estrus interval (IEI) were affected by season (P<0.05). Body condition score (BCS) of sows influenced EOI (P<0.01). Sows with low backfat thickness, lactation length <20 days, or litter weight ≥67 kg, had delayed injection-to-ovulation interval (P<0.05). In conclusions, buserelin administration (10 µg, at 72 hr after weaning) advanced ovulation. Hot season prolonged ovulation time. Sows that were weaned with lactation length of at least 20 days, litter weight less than 67 kg, or BCS of at least 3, had better responses to buserelin injection. High backfat reserve after weaning is important for ovulation induction response by buserelin injection.
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spelling pubmed-68956212019-12-10 Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons PEARODWONG, Pachara TRETIPSKUL, Chanyuth SOEDE, Nicoline M. TUMMARUK, Padet J Vet Med Sci Theriogenology Follicle development in post-weaning sows is influenced by various factors. To control ovulation time using hormone, factors that influence ovulation should be investigated. The present study was performed to evaluate the effect of GnRH (buserelin) administration in relation to season and sow parameters on ovulation time in weaned sows. Seventy-seven weaned sows were divided into the following groups: control (hot season, n=21; cool season, n=16) and treatment (hot season, n=22; cool season, n=18). Sows were kept in a close house equipped with an evaporative cooling system. Ovulation time was determined every 6 hr using transrectal ultrasonography. Administration of 10 µg buserelin at 72 hr after weaning affected estrus-to-ovulation interval (EOI) and weaning-to-ovulation interval (WOI) in sows (P<0.05). The percentage of sows that ovulated between 44–56 hr after injection was higher in the cool season than in hot season (P<0.05). Weaning-to-estrus interval (WEI) and injection-to-estrus interval (IEI) were affected by season (P<0.05). Body condition score (BCS) of sows influenced EOI (P<0.01). Sows with low backfat thickness, lactation length <20 days, or litter weight ≥67 kg, had delayed injection-to-ovulation interval (P<0.05). In conclusions, buserelin administration (10 µg, at 72 hr after weaning) advanced ovulation. Hot season prolonged ovulation time. Sows that were weaned with lactation length of at least 20 days, litter weight less than 67 kg, or BCS of at least 3, had better responses to buserelin injection. High backfat reserve after weaning is important for ovulation induction response by buserelin injection. The Japanese Society of Veterinary Science 2019-09-13 2019-11 /pmc/articles/PMC6895621/ /pubmed/31527339 http://dx.doi.org/10.1292/jvms.18-0429 Text en ©2019 The Japanese Society of Veterinary Science This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/)
spellingShingle Theriogenology
PEARODWONG, Pachara
TRETIPSKUL, Chanyuth
SOEDE, Nicoline M.
TUMMARUK, Padet
Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
title Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
title_full Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
title_fullStr Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
title_full_unstemmed Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
title_short Factors affecting estrus and ovulation time in weaned sows with induced ovulation by GnRH administration in different seasons
title_sort factors affecting estrus and ovulation time in weaned sows with induced ovulation by gnrh administration in different seasons
topic Theriogenology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6895621/
https://www.ncbi.nlm.nih.gov/pubmed/31527339
http://dx.doi.org/10.1292/jvms.18-0429
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