Evaluation of false ultrasonographic pregnancy diagnoses in sows by measuring the concentration of unconjugated estrogens in feces

O. Szenci, R. Palme, M. A M Taverne, J. Varga, N. Meersma, E. Wissink

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

On Days 26, 28, and 30 after AI, ultrasonographic pregnancy diagnoses were performed on 207 gilts and sows by using a 3.5 MHz-linear-array transducer. Fecal samples were taken from the rectum after each ultrasonographic examination, and the concentrations of unconjugated estrogens in selected samples (n=73) were measured by RIA. Fecal unconjugated estrogen concentration of 11.7 ng/g feces or higher was indicative of pregnancy. The overall sensitivity and specificity of the ultrasonographic test was 99% for farrowing sows and 73.1% for nonfarrowing sows. With one exception, sows with a false negative diagnosis by ultrasonography on Day 26 were correctly diagnosed pregnant by elevated fecal unconjugated estrogens or repeated ultrasonographic examinations on Days 28 or 30. Return to estrus around the sampling period may cause false positive results in the unconjugated estrogen assay, while early embryonic mortality can result in false positive diagnoses in both the ultrasonographic test and estrogen assay. Although there was a positive correlation between the concentrations of unconjugated estrogens in the feces and litter size at farrowing in the selected sows, it seems very unlikely that fecal estrogens can provide an accurate tool for predicting litter size.

Original languageEnglish
Pages (from-to)873-882
Number of pages10
JournalTheriogenology
Volume48
Issue number5
DOIs
Publication statusPublished - Oct 1 1997

Fingerprint

pregnancy diagnosis
Feces
estrogens
sows
Estrogens
feces
Pregnancy
Litter Size
farrowing
litter size
Estrus
embryonic mortality
assays
rectum
Transducers
Rectum
gilts
sampling
ultrasonography
estrus

Keywords

  • Feces
  • Pregnancy diagnosis
  • Sow
  • Ultrasonography
  • Unconjugated estrogens

ASJC Scopus subject areas

  • Animal Science and Zoology
  • veterinary(all)

Cite this

Evaluation of false ultrasonographic pregnancy diagnoses in sows by measuring the concentration of unconjugated estrogens in feces. / Szenci, O.; Palme, R.; Taverne, M. A M; Varga, J.; Meersma, N.; Wissink, E.

In: Theriogenology, Vol. 48, No. 5, 01.10.1997, p. 873-882.

Research output: Contribution to journalArticle

@article{433b9b61c699463caa4d862550c64e6a,
title = "Evaluation of false ultrasonographic pregnancy diagnoses in sows by measuring the concentration of unconjugated estrogens in feces",
abstract = "On Days 26, 28, and 30 after AI, ultrasonographic pregnancy diagnoses were performed on 207 gilts and sows by using a 3.5 MHz-linear-array transducer. Fecal samples were taken from the rectum after each ultrasonographic examination, and the concentrations of unconjugated estrogens in selected samples (n=73) were measured by RIA. Fecal unconjugated estrogen concentration of 11.7 ng/g feces or higher was indicative of pregnancy. The overall sensitivity and specificity of the ultrasonographic test was 99{\%} for farrowing sows and 73.1{\%} for nonfarrowing sows. With one exception, sows with a false negative diagnosis by ultrasonography on Day 26 were correctly diagnosed pregnant by elevated fecal unconjugated estrogens or repeated ultrasonographic examinations on Days 28 or 30. Return to estrus around the sampling period may cause false positive results in the unconjugated estrogen assay, while early embryonic mortality can result in false positive diagnoses in both the ultrasonographic test and estrogen assay. Although there was a positive correlation between the concentrations of unconjugated estrogens in the feces and litter size at farrowing in the selected sows, it seems very unlikely that fecal estrogens can provide an accurate tool for predicting litter size.",
keywords = "Feces, Pregnancy diagnosis, Sow, Ultrasonography, Unconjugated estrogens",
author = "O. Szenci and R. Palme and Taverne, {M. A M} and J. Varga and N. Meersma and E. Wissink",
year = "1997",
month = "10",
day = "1",
doi = "10.1016/S0093-691X(97)00308-7",
language = "English",
volume = "48",
pages = "873--882",
journal = "Theriogenology",
issn = "0093-691X",
publisher = "Elsevier Inc.",
number = "5",

}

TY - JOUR

T1 - Evaluation of false ultrasonographic pregnancy diagnoses in sows by measuring the concentration of unconjugated estrogens in feces

AU - Szenci, O.

AU - Palme, R.

AU - Taverne, M. A M

AU - Varga, J.

AU - Meersma, N.

AU - Wissink, E.

PY - 1997/10/1

Y1 - 1997/10/1

N2 - On Days 26, 28, and 30 after AI, ultrasonographic pregnancy diagnoses were performed on 207 gilts and sows by using a 3.5 MHz-linear-array transducer. Fecal samples were taken from the rectum after each ultrasonographic examination, and the concentrations of unconjugated estrogens in selected samples (n=73) were measured by RIA. Fecal unconjugated estrogen concentration of 11.7 ng/g feces or higher was indicative of pregnancy. The overall sensitivity and specificity of the ultrasonographic test was 99% for farrowing sows and 73.1% for nonfarrowing sows. With one exception, sows with a false negative diagnosis by ultrasonography on Day 26 were correctly diagnosed pregnant by elevated fecal unconjugated estrogens or repeated ultrasonographic examinations on Days 28 or 30. Return to estrus around the sampling period may cause false positive results in the unconjugated estrogen assay, while early embryonic mortality can result in false positive diagnoses in both the ultrasonographic test and estrogen assay. Although there was a positive correlation between the concentrations of unconjugated estrogens in the feces and litter size at farrowing in the selected sows, it seems very unlikely that fecal estrogens can provide an accurate tool for predicting litter size.

AB - On Days 26, 28, and 30 after AI, ultrasonographic pregnancy diagnoses were performed on 207 gilts and sows by using a 3.5 MHz-linear-array transducer. Fecal samples were taken from the rectum after each ultrasonographic examination, and the concentrations of unconjugated estrogens in selected samples (n=73) were measured by RIA. Fecal unconjugated estrogen concentration of 11.7 ng/g feces or higher was indicative of pregnancy. The overall sensitivity and specificity of the ultrasonographic test was 99% for farrowing sows and 73.1% for nonfarrowing sows. With one exception, sows with a false negative diagnosis by ultrasonography on Day 26 were correctly diagnosed pregnant by elevated fecal unconjugated estrogens or repeated ultrasonographic examinations on Days 28 or 30. Return to estrus around the sampling period may cause false positive results in the unconjugated estrogen assay, while early embryonic mortality can result in false positive diagnoses in both the ultrasonographic test and estrogen assay. Although there was a positive correlation between the concentrations of unconjugated estrogens in the feces and litter size at farrowing in the selected sows, it seems very unlikely that fecal estrogens can provide an accurate tool for predicting litter size.

KW - Feces

KW - Pregnancy diagnosis

KW - Sow

KW - Ultrasonography

KW - Unconjugated estrogens

UR - http://www.scopus.com/inward/record.url?scp=0031252141&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031252141&partnerID=8YFLogxK

U2 - 10.1016/S0093-691X(97)00308-7

DO - 10.1016/S0093-691X(97)00308-7

M3 - Article

VL - 48

SP - 873

EP - 882

JO - Theriogenology

JF - Theriogenology

SN - 0093-691X

IS - 5

ER -