Document Detail


Intermittent suckling enables estrus and pregnancy during lactation in sows: effects of stage of lactation and lactation during early pregnancy.
MedLine Citation:
PMID:  18789517     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Previously we demonstrated that pre-ovulatory LH and post-ovulatory progesterone (P4) concentrations in plasma were low and embryo development was retarded when sows were induced to ovulate during lactation by submitting them to intermittent suckling (IS). The present study investigated whether this was due to: (1) stage of lactation when IS was initiated, and (2) continuation of IS post-ovulation. Multiparous Topigs40 sows were studied under three conditions: conventional weaning at Day 21 of lactation (C21; n=30), intermittent suckling from Day 14 of lactation (IS14; n=32), and intermittent suckling from Day 21 of lactation (IS21; n=33). Sows were separated from piglets for 12h daily during IS. IS sows were either weaned at ovulation or 20d following ovulation. One-third (21/63) of the IS21 and C21 sows had already ovulated or had large pre-ovulatory follicles at Day 21 and were excluded from further study. Initiation of IS at Day 14 instead of Day 21 of lactation tended to reduce P4 at 7d post-ovulation (P=0.07), did not affect pregnancy rate, and tended to reduce embryo survival (P=0.06). Continuation of IS during pregnancy resulted in lower P4 at 7 and 12d post-ovulation, tended to reduce embryo weight and pregnancy rate (P<0.10), whereas embryo survival was not affected. This study presents data for a population of sows in which follicle growth and ovulation are easily triggered under suckling conditions. Further, when these sows are bred during lactation, initiation of IS at 21 rather than 14d of lactation with weaning at ovulation yields the most desirable reproductive performance.
Authors:
R Gerritsen; N M Soede; W Hazeleger; P Langendijk; S J Dieleman; M A M Taverne; B Kemp
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Publication Detail:
Type:  Controlled Clinical Trial; Journal Article     Date:  2008-09-11
Journal Detail:
Title:  Theriogenology     Volume:  71     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2009 Feb 
Date Detail:
Created Date:  2008-12-30     Completed Date:  2009-03-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  432-40     Citation Subset:  IM    
Affiliation:
Adaptation Physiology, Animal Sciences Group, Wageningen University, 6700 AH Wageningen, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Animals
Animals, Suckling / physiology*
Corpus Luteum / physiology
Estrus / physiology*
Female
Lactation / physiology*
Luteinizing Hormone / blood
Ovarian Follicle / physiology
Pregnancy
Progesterone / blood
Swine / physiology*
Chemical
Reg. No./Substance:
57-83-0/Progesterone; 9002-67-9/Luteinizing Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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