Document Detail


Effects of a shortened preovulatory follicular phase on genital blood flow and endometrial hormone receptor concentrations in Holstein-Friesian cows.
MedLine Citation:
PMID:  19897233     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The goal of this study was to determine the effects of the length of the preovulatory phase on genital blood flow and mRNA expression of endometrial hormone receptors in cattle (Bos Taurus). Ovulation was synchronized in 50 Holstein-Friesian cows using a modified Ovsynch (ovulation synchronization) protocol, in which the second gonadotropin-releasing hormone (GnRH) administration was given 40h (G40, n=17) or 60h (G60, n=16) after the prostaglandin F(2alpha) (PGF(2alpha)) administration. The third group (S, n=17) did not receive a second GnRH administration. Transrectal color Doppler examinations were carried out 24h before (Day -1) and on Day 7 after ovulation (Day 0). Follicular size (FS) and luteal size (CLS) were quantified by measuring the areas of these structures on cross-sectional B-mode ultrasound images. Follicular blood flow (FB) and luteal blood flow (CLB) were quantified by determining the colored areas of these structures. Uterine blood flow was measured using the time-averaged maximum velocities (TAMVs) and the pulsatility indices (PIs) of both uterine arteries. Endometrial mRNA transcript abundance of estrogen receptors alpha and beta as well as oxytocin and progesterone receptor were determined on Days -1 and 7 in G40 and G60 cows. In all cows, plasma progesterone (P(4)) values were measured on Day 7. On Day -1, FS and FB values were lower (P < or = 0.05) in G40 cows compared with those in S cows but did not differ (P>0.05) between G60 cows on the one hand and G40 cows and S cows, respectively, on the other hand. On Day 7, CLS and P(4) did not differ (P>0.05) between cows of Groups G40, G60, and S; CLB was lower (P< or =0.05) in G40 cows than in G60 and S cows, but no difference (P>0.05) occurred between G60 and S cows. The uterine TAMV and PI values did not differ among the three groups (P>0.05). Gene expression of hormone receptors did not differ (P>0.05) between Groups G40 and G60 on Days -1 and 7. Results of this study indicate that a shortened preovulatory follicle phase primarily affects ovarian but not the measured uterine events in cows undergoing synchronization of ovulation.
Authors:
H Bollwein; D Prost; S E Ulbrich; H Niemann; A Honnens
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Theriogenology     Volume:  73     ISSN:  1879-3231     ISO Abbreviation:  Theriogenology     Publication Date:  2010 Jan 
Date Detail:
Created Date:  2009-12-17     Completed Date:  2010-02-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  242-9     Citation Subset:  IM    
Affiliation:
Clinic for Cattle, School of Veterinary Medicine Hannover, Hannover, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Flow Velocity / veterinary
Cattle / genetics,  metabolism,  physiology*
Corpus Luteum / blood supply,  ultrasonography
Endometrium / metabolism
Estrus Synchronization
Female
Follicular Phase / blood*
Ovarian Follicle / blood supply,  ultrasonography
Ovulation / blood*
Progesterone / blood
RNA, Messenger / metabolism
Receptors, Estrogen / genetics,  metabolism
Receptors, Oxytocin / genetics,  metabolism
Receptors, Progesterone / genetics,  metabolism
Regional Blood Flow
Uterus / blood supply*,  ultrasonography
Chemical
Reg. No./Substance:
0/RNA, Messenger; 0/Receptors, Estrogen; 0/Receptors, Oxytocin; 0/Receptors, Progesterone; 57-83-0/Progesterone

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


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