Technical note: Comparison between two tracing methods with ultrasonography to determine lumen area of the caudal artery in beef cattle

Two experiments were conducted to compare variation between 2 tracing methods in measuring cross-sectional lumen area of the caudal artery in 5 beef heifers on 3 different dates (Exp. 1) and to compare tracing methods in detecting changes in artery lumen area after 5 heifers were switched from a die...

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Bibliographic Details
Published in:Journal of animal science 2009, Vol.87 (1), p.371-374
Main Authors: Aiken, G.E, Klotz, J.L, Kirch, B.H, Strickland, J.R, Boykin, D.L
Format: Article
Language:English
Subjects:
accuracy
Animal Feed - microbiology
Animal productions
Animals
arteries
Arteries - anatomy & histology
Arteries - diagnostic imaging
beef cattle
Biological and medical sciences
blood flow
Blood Flow Velocity - veterinary
Cattle - anatomy & histology
connective tissues
Diet - veterinary
Doppler flow signal
endophytes
experimental design
Female
Festuca arundinacea
forage grasses
Fundamental and applied biological sciences. Psychology
heifers
intimin
lumen area
measurement
methodology
Neotyphodium coenophialum
precision
Sacrococcygeal Region - blood supply
temporal variation
Terrestrial animal productions
ultrasonography
Ultrasonography, Doppler - methods
Ultrasonography, Doppler - veterinary
Vertebrates
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Summary:Two experiments were conducted to compare variation between 2 tracing methods in measuring cross-sectional lumen area of the caudal artery in 5 beef heifers on 3 different dates (Exp. 1) and to compare tracing methods in detecting changes in artery lumen area after 5 heifers were switched from a diet containing nonendophyte-infected tall fescue [Schedonorus arundinaceus (Schreb.) Dumort] seed to one containing endophyte-infected tall fescue seed (Exp. 2). Lumen area determined by tracing the Doppler flow signal was 25% less than that determined by tracing the intima of the connective tissue, but there was no difference (P = 0.90) in the variation of measures between the 2 methods in Exp. 1. Declines in lumen area were detected at the same level of significance (P < 0.01) for both tracing methods after cattle in Exp. 2 were switched from noninfected to infected tall fescue diets. Variation in lumen areas was different between noninfected and infected diets with tracing the Doppler flow signal (P < 0.05) or the intima of the connective tissue (P < 0.01). Results indicated that lumen area of the caudal artery can be measured with similar precision by tracing the intima of the connective tissue in the artery wall or the outer boundary of the Doppler flow signal.
ISSN:0021-8812
1525-3163
DOI:10.2527/jas.2008-1087