Evaluation of a new approach for the estimation of the time of the LH surge in dairy cows using vaginal temperature and electrodeless conductivity measurements

Fisher, A.D., Morton, R., Dempsey, J.M.A., Henshall, J.M. and Jonathan Hill (2008) Evaluation of a new approach for the estimation of the time of the LH surge in dairy cows using vaginal temperature and electrodeless conductivity measurements. Theriogenology, 70 7: 1065-1074. doi:10.1016/j.theriogenology.2008.06.023


Author Fisher, A.D.
Morton, R.
Dempsey, J.M.A.
Henshall, J.M.
Jonathan Hill
Title Evaluation of a new approach for the estimation of the time of the LH surge in dairy cows using vaginal temperature and electrodeless conductivity measurements
Journal name Theriogenology   Check publisher's open access policy
ISSN 0093-691X
Publication date 2008-01-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.theriogenology.2008.06.023
Open Access Status
Volume 70
Issue 7
Start page 1065
End page 1074
Total pages 10
Editor Shille, V.M.
Archibald, L.F.
Place of publication US
Publisher Elsevier Inc.
Language eng
Subject C1
070206 Animal Reproduction
830302 Dairy Cattle
Abstract The objective of the study was to test the effectiveness of a new type of conductivity sensor, along with vaginal temperature, at identifying the LH peak associated with estrus in dairy cows. Twelve mature non-lactating Holstein–Friesian cows had their estrous cycles synchronized on two occasions, and then data were collected for the following spontaneous cycles. An indwelling electrodeless plastic-coated toroidal conductivity sensor, which also recorded temperature, was placed in the vagina throughout the cycle. Blood samples were collected for LH measurement, and ultrasound scanning used to confirm ovulation. Although there was a relationship between vaginal mucus conductivity measured by the toroidal sensor and the timing of the LH surge, it was not sufficiently robust in individual cows to be able to identify the time of the LH surge. The mean increase in vaginal temperature at estrus was 0.48 8C. An algorithm was developed which used the detected individual cow temperature peak to test the relationship with the LH peak. In 16 out of 21 cases where ovulation was confirmed and data existed, the estimated individual peak was within 4 h of the LH surge, in three cases it was 6 h, and in two instances it was early. In conclusion, the temperature algorithm was able to identify the time of the LH surge and thus predict time of ovulation in a way that would allow effective AI, although this result needs to be tested in lactating cows. However, the toroidal conductivity sensing method was not able to produce data of sufficient quality to develop a predictive relationship in individual cows
Keyword Reproductive Biology
Veterinary Sciences
Reproductive Biology
Veterinary Sciences
REPRODUCTIVE BIOLOGY
VETERINARY SCIENCES
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Veterinary Science Publications
 
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Created: Tue, 14 Apr 2009, 20:55:40 EST by Narelle Poole on behalf of School of Veterinary Science