Document Detail

Antiluteolytic strategies to improve fertility in cattle.
MedLine Citation:
PMID:  11768810     Owner:  NLM     Status:  MEDLINE    
During early pregnancy, a "critical period" may be defined between Days 15 and 17. Embryonic mortality associated with this period causes significant economic losses to the cattle industry. During this period, the endometrium will follow a default program to release luteolytic pulses of PGF2alpha, unless the conceptus sends appropriate antiluteolytic signals to block PGF2alpha, production. Maintenance of pregnancy is dependent on a successful blockage of endometrial PGF2alpha production. Biology of the critical period is complex and multifactorial. Endocrine, cellular and molecular factors, both from maternal and conceptus origins act in concert to determine whether luteolysis or maintenance of pregnancy will prevail. Understanding the influences of such factors in the biology of the critical period allowed researchers to produce a series of strategies aiming to favor maintenance of pregnancy in lieu of luteolysis. Strategies include hormonal and nutritional manipulations to decrease plasma concentrations of estradiol 17beta (E2) while increasing those of progesterone (P4), and inhibiting the PGF2alpha-synthesizing enzymatic machinery in the endometrium during the critical period. Experimental results indicate that use of such strategies has improved pregnancy rates following artificial insemination and embryo transfer programs.
M Binelli; W W Thatcher; R Mattos; P S Baruselli
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Theriogenology     Volume:  56     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2001 Dec 
Date Detail:
Created Date:  2001-12-21     Completed Date:  2002-04-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1451-63     Citation Subset:  IM    
Departamento de Reprodução Animal, FMVZ-USP, Pirassununga, Brazil.
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MeSH Terms
Cattle / physiology*
Corpus Luteum / metabolism*
Dinoprost / secretion*
Embryo Transfer / veterinary
Endometrium / cytology,  metabolism*
Estradiol / blood
Fertilization in Vitro / veterinary
Luteal Phase / blood
Pregnancy Outcome / veterinary*
Pregnancy Rate
Pregnancy, Animal / physiology*
Progesterone / blood
Reg. No./Substance:
50-28-2/Estradiol; 551-11-1/Dinoprost; 57-83-0/Progesterone

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

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