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Vulvar electrical impedance in periparturient cows and its relation to plasma progesterone, oestradiol-17β and PGFM
Year:
1990
Source of publication :
Animal Reproduction Science
Authors :
Aizinbud, Eliezer
;
.
Ezov, Nathan
;
.
Lehrer, A. R.
;
.
Ron, Micha
;
.
Volume :
23
Co-Authors:
Schindler, D., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Lewis, G.S., Department of Animal Science, Virginia Polytechnic Institute, State University, Blacksburg, VA 24061, United States
Rosenberg, M., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Tadmor, A., Kimron Veterinary Institute, Bet Dagan, 50250, Israel
Ezov, N., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Ron, M., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Aizinbud, E., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Lehrer, A.R., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Facilitators :
From page:
283
To page:
292
(
Total pages:
10
)
Abstract:
In previous studies we described the vulvar electrical impedance (VEI) - which refers to tissue hydration - during the oestrous cycle of cows. The objectives of the present study were to: (1) describe VEI changes around the time of calving; and (2) determine the relationship between periparturient changes in VEI and jugular plasma concentrations of oestradiol-17β (E2), progesterone (P4), and 13, 14-dihydro-15-keto PGE2α (PGFM). Cylindrical bipolar electrodes were implanted inside the vulvar labiae of seven Israeli-Friesian cows. From day 245 of gestation through 15 days postpartum, VEI was measured, once daily in the morning, by means of a Hewlett-Packard multifrequency impedance analyser. Jugular blood samples for hormone determination were collected immediately after each VEI measurement. VEI decreased from approximately 150 Ω 27 days before parturition (day of calving = day 0) to 120 Ω on day - 10. The % prepartal VEI decrease was greater at current frequencies < 10 kHz than at > 10 kHz. This indicated that the decrease was caused mainly by an increase in the extracellular compartment. During that period P4 decreased from ∼ I 1 ng/ml to 6 ng/ml and E2 increased from 50 pg/ml to 150 pg/ml. VEI remained low until parturition, while P4 continued to decrease to < 1 ng/ml and E2 continued to increase to ∼ 600 pg/ml at calving. There was no significant prepartal relationship between PGFM and VEI. VEI increased postpartum from 120 Ω on day 1 postpartum to 155 Ω on day 11 and remained high thereafter. A negative linear relationship between PGFM and VEI was found during the postpartum period. The prepartal decrease of VEI occurred when the E2:P4 (pg/ml:ng/ml) ratio was ≥ 10:1. Measuring VEI may become a tool for (1) studying the dynamics of hormone action on the hydration of target tissues; (2) determining impending calving; and (3) monitoring the recovery of genital tissue after calving. © 1990.
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DOI :
10.1016/0378-4320(90)90042-E
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21077
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:41
Scientific Publication
Vulvar electrical impedance in periparturient cows and its relation to plasma progesterone, oestradiol-17β and PGFM
23
Schindler, D., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Lewis, G.S., Department of Animal Science, Virginia Polytechnic Institute, State University, Blacksburg, VA 24061, United States
Rosenberg, M., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Tadmor, A., Kimron Veterinary Institute, Bet Dagan, 50250, Israel
Ezov, N., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Ron, M., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Aizinbud, E., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Lehrer, A.R., Agricultural Research Organization, The Volcani Center, Institute of Animal Science, Bet Dagan, 50250, Israel
Vulvar electrical impedance in periparturient cows and its relation to plasma progesterone, oestradiol-17β and PGFM
In previous studies we described the vulvar electrical impedance (VEI) - which refers to tissue hydration - during the oestrous cycle of cows. The objectives of the present study were to: (1) describe VEI changes around the time of calving; and (2) determine the relationship between periparturient changes in VEI and jugular plasma concentrations of oestradiol-17β (E2), progesterone (P4), and 13, 14-dihydro-15-keto PGE2α (PGFM). Cylindrical bipolar electrodes were implanted inside the vulvar labiae of seven Israeli-Friesian cows. From day 245 of gestation through 15 days postpartum, VEI was measured, once daily in the morning, by means of a Hewlett-Packard multifrequency impedance analyser. Jugular blood samples for hormone determination were collected immediately after each VEI measurement. VEI decreased from approximately 150 Ω 27 days before parturition (day of calving = day 0) to 120 Ω on day - 10. The % prepartal VEI decrease was greater at current frequencies < 10 kHz than at > 10 kHz. This indicated that the decrease was caused mainly by an increase in the extracellular compartment. During that period P4 decreased from ∼ I 1 ng/ml to 6 ng/ml and E2 increased from 50 pg/ml to 150 pg/ml. VEI remained low until parturition, while P4 continued to decrease to < 1 ng/ml and E2 continued to increase to ∼ 600 pg/ml at calving. There was no significant prepartal relationship between PGFM and VEI. VEI increased postpartum from 120 Ω on day 1 postpartum to 155 Ω on day 11 and remained high thereafter. A negative linear relationship between PGFM and VEI was found during the postpartum period. The prepartal decrease of VEI occurred when the E2:P4 (pg/ml:ng/ml) ratio was ≥ 10:1. Measuring VEI may become a tool for (1) studying the dynamics of hormone action on the hydration of target tissues; (2) determining impending calving; and (3) monitoring the recovery of genital tissue after calving. © 1990.
Scientific Publication
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