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Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows

This study sought to establish whether temperature gradients between the cervix, vagina, and rectum at and 7 days post-artificial insemination (AI) were associated with the incidence of pregnancy in lactating dairy cows (Experiment I; n = 90 ovulating cows) and to evaluate temperature gradient dynam...

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Autores principales: LÓPEZ-GATIUS, Fernando, GARCIA-ISPIERTO, Irina, HUNTER, Ronald H.F.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Society for Reproduction and Development 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8423606/
https://www.ncbi.nlm.nih.gov/pubmed/34053994
http://dx.doi.org/10.1262/jrd.2021-022
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author LÓPEZ-GATIUS, Fernando
GARCIA-ISPIERTO, Irina
HUNTER, Ronald H.F.
author_facet LÓPEZ-GATIUS, Fernando
GARCIA-ISPIERTO, Irina
HUNTER, Ronald H.F.
author_sort LÓPEZ-GATIUS, Fernando
collection PubMed
description This study sought to establish whether temperature gradients between the cervix, vagina, and rectum at and 7 days post-artificial insemination (AI) were associated with the incidence of pregnancy in lactating dairy cows (Experiment I; n = 90 ovulating cows) and to evaluate temperature gradient dynamics from the time of insemination to 7 days post-AI under heat stress conditions (Experiment II; n = 16 ovulating and 4 non-ovulating cows). In Experiment I, 39 cows (43.3%) became pregnant. The odds ratio for pregnancy was 2.5 for each one-tenth of a degree drop in cervical temperature with reference to the control rectal temperature at the time of AI (P = 0.01), whereas the same decrease in the cervix–rectum temperature differential 7 days post-AI resulted in an odds ratio of 0.44 (P = 0.02). In Experiment II, 5 of the ovulating cows (31.3%) became pregnant. The mean values of the vagina–rectum, vagina–cervix, and cervix–rectum temperature differentials at AI (day 0), 8 h, 24 h, and 7 days post-AI changed significantly from day 0 to day 7 (within-subject effect; P < 0.02) in ovulating cows but not in non-ovulating cows. Temperature differentials on days 0 and 7 were similar between ovulating cows and cows of Experiment I. Overall, our findings support the notion that a temperature differential between the caudal cervical canal and rectum at AI may be an indicator of the likelihood of pregnancy. Possible prospects of confirming estrus at the herd-level are also suggested.
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spelling pubmed-84236062021-09-10 Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows LÓPEZ-GATIUS, Fernando GARCIA-ISPIERTO, Irina HUNTER, Ronald H.F. J Reprod Dev Original Article This study sought to establish whether temperature gradients between the cervix, vagina, and rectum at and 7 days post-artificial insemination (AI) were associated with the incidence of pregnancy in lactating dairy cows (Experiment I; n = 90 ovulating cows) and to evaluate temperature gradient dynamics from the time of insemination to 7 days post-AI under heat stress conditions (Experiment II; n = 16 ovulating and 4 non-ovulating cows). In Experiment I, 39 cows (43.3%) became pregnant. The odds ratio for pregnancy was 2.5 for each one-tenth of a degree drop in cervical temperature with reference to the control rectal temperature at the time of AI (P = 0.01), whereas the same decrease in the cervix–rectum temperature differential 7 days post-AI resulted in an odds ratio of 0.44 (P = 0.02). In Experiment II, 5 of the ovulating cows (31.3%) became pregnant. The mean values of the vagina–rectum, vagina–cervix, and cervix–rectum temperature differentials at AI (day 0), 8 h, 24 h, and 7 days post-AI changed significantly from day 0 to day 7 (within-subject effect; P < 0.02) in ovulating cows but not in non-ovulating cows. Temperature differentials on days 0 and 7 were similar between ovulating cows and cows of Experiment I. Overall, our findings support the notion that a temperature differential between the caudal cervical canal and rectum at AI may be an indicator of the likelihood of pregnancy. Possible prospects of confirming estrus at the herd-level are also suggested. The Society for Reproduction and Development 2021-05-30 2021-08 /pmc/articles/PMC8423606/ /pubmed/34053994 http://dx.doi.org/10.1262/jrd.2021-022 Text en ©2021 Society for Reproduction and Development https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives (by-nc-nd) License. (CC-BY-NC-ND 4.0: https://creativecommons.org/licenses/by-nc-nd/4.0/)
spellingShingle Original Article
LÓPEZ-GATIUS, Fernando
GARCIA-ISPIERTO, Irina
HUNTER, Ronald H.F.
Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
title Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
title_full Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
title_fullStr Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
title_full_unstemmed Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
title_short Cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
title_sort cervix–rectum temperature differential at the time of insemination is correlated with the potential for pregnancy in dairy cows
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8423606/
https://www.ncbi.nlm.nih.gov/pubmed/34053994
http://dx.doi.org/10.1262/jrd.2021-022
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