Document Detail

Effect of progesterone, mifepristone, and estrogen treatment during early pregnancy on conceptus development and uterine capacity in Swine.
MedLine Citation:
PMID:  12954726     Owner:  NLM     Status:  MEDLINE    
A series of experiments was performed to investigate the influence of progesterone at Days 2 and 3 of pregnancy on conceptus development and uterine capacity. In experiment 1, unilaterally hysterectomized-ovariectomized (UHO) white crossbred gilts were given no treatment, estradiol valerate (5 mg given on Days 11 and 12), or progesterone (200 mg/day on Days 2 and 3 after mating). On Day 105 of pregnancy, each fetus and its associated placenta were weighed, and the number of live and dead fetuses was recorded for each litter. Early progesterone treatment reduced (P < 0.05) litter size (a measure of uterine capacity in UHO gilts). In experiment 2, intact white crossbred gilts were mated, given no treatment or progesterone treatment on Days 2 and 3 of pregnancy, and farrowed. Progesterone treatment decreased (P < 0.05) pregnancy rates. In pregnant gilts, progesterone had no effect on the number of live or stillborn piglets at birth, and gestation length was decreased (P < 0.05). Progesterone treatment did not affect the number of large or small piglets. In experiment 3, intact gilts were mated at estrus and then received 1). no treatment or treatment with 2). 100 mg, 3). 200 mg, or 4). 400 mg mifepristone (also known as RU486) on Day 2 of pregnancy. On Day 11 of pregnancy, both uterine horns were flushed, the number and diameter of each conceptus was recorded, and the flushed material was assayed for total protein and acid phosphatase. The 400 mg mifepristone treatment decreased conceptus diameter (P < 0.05) and total protein (P = 0.06) in the uterine flushings. In experiment 4, UHO gilts were mated at estrus, injected with either corn oil (control) or mifepristone (400 mg) on Day 2 of pregnancy, and killed on Day 105 of pregnancy, and the number and weight of live fetuses and placentas was recorded. In contrast to the effect of progesterone treatment, mifepristone decreased uterine capacity by decreasing the number of small conceptuses. These data suggest that progesterone concentrations on Days 2 and 3 of pregnancy in swine influence the rate of conceptus development during early pregnancy and uterine capacity during later pregnancy.
J L Vallet; R K Christenson
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Publication Detail:
Type:  Journal Article     Date:  2003-09-03
Journal Detail:
Title:  Biology of reproduction     Volume:  70     ISSN:  0006-3363     ISO Abbreviation:  Biol. Reprod.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-12-22     Completed Date:  2004-03-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0207224     Medline TA:  Biol Reprod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  92-8     Citation Subset:  IM    
USDA, ARS, Roman L Hruska US Meat Animal Research Center, Clay Center, Nebraska 68933, USA.
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MeSH Terms
Embryonic and Fetal Development / drug effects*
Estrogens / pharmacology*
Gestational Age
Litter Size / drug effects
Luteolytic Agents / pharmacology*
Mifepristone / pharmacology*
Pregnancy Rate
Progesterone / pharmacology*
Uterus / drug effects
Reg. No./Substance:
0/Estrogens; 0/Luteolytic Agents; 57-83-0/Progesterone; 84371-65-3/Mifepristone

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

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