Use of chorionic gonadotropins during lactation to optimize postpartum sow reproductive performance: a review

Treating lactating sows with chorionic gonadotropins may allow controlling their post-weaning reproductive function, despite the occurrence of anestrous during lactation. This article reviews the potential effectiveness of treatment with both equine and human chorionic gonadotropins (eCG and hCG, re...

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Bibliographic Details
Published in:	Animal reproduction Vol. 21; no. 2; p. e20230118
Main Authors:	Quirino, Monike Willemin, Schultz, Carolini, Franz, Michele Dos Passos Dezordi, Lucia, Jr, Thomaz, Martelli, Arthur, Gonçalves, Paulo Bayard Dias, Ulguim, Rafael da Rosa, Gasperin, Bernardo Garziera, Bianchi, Ivan
Format:	Journal Article
Language:	English
Published:	Brazil Colégio Brasileiro de Reprodução Animal 01-01-2024
Subjects:	BIOTECHNOLOGY & APPLIED MICROBIOLOGY Review hormone therapy sows lactation estrus ovulation
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Summary:	Treating lactating sows with chorionic gonadotropins may allow controlling their post-weaning reproductive function, despite the occurrence of anestrous during lactation. This article reviews the potential effectiveness of treatment with both equine and human chorionic gonadotropins (eCG and hCG, respectively) during lactation on the control of estrus expression and ovulation in weaned sows. The use of 1,000 IU hCG at 24 and 48 h postpartum may induce ovulation in the treated sows, but the ovulation rate may be variable. Pregnancy rates may be improved with combined treatment after the second week of lactation with both chorionic gonadotropins: 1,500 IU eCG plus 500 - 1,000 hCG; or 1,000 IU eCG plus 1,000 IU hCG. Treatment with eCG (1,000 - 2,000 IU) at the end of lactation may result in acceptable estrus expression and ovulation rates, although with marginal benefit for pregnancy rates. The subsequent response to treatments with chorionic gonadotropins during lactation is likely influenced by the treatment period, the suckling frequency during lactation, and the boar exposure during the weaning-to-estrus interval. A better understanding of the efficiency of such steroid-free treatments is increasingly relevant due to the constraints of the use of steroid hormones in livestock reproductive management.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 ObjectType-Review-3 content type line 23 Conflicts of interest: The authors have no conflict of interest to declare.
ISSN:	1806-9614 1984-3143 1984-3143
DOI:	10.1590/1984-3143-AR2023-0118