Temperature gradients in vivo influence maturing male and female gametes in mammals: evidence from the cow

Hunter, Richard; López‐Gatius, F.; López-Albors, Octavio

doi:10.1071/rd17089

Cited by 13 publications

(8 citation statements)

References 33 publications

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“…Recently, direct measurements of temperature in preovulatory follicles have been performed in the cow by means of a thermistor probe introduced into the antrum under ultrasound guidance. Such follicles revealed a mean antral (follicular fluid) temperature 0.74°C and 1.54°C cooler than the uterine surface and rectal temperatures, respectively (Hunter, López‐Gatius, & López‐Albors, ); however, this temperature gradient was not found in non‐ovulatory follicles (López‐Gatius & Hunter, ). The origin of this lower temperature seems to be based on a heat‐consuming process in the expanding follicular fluid, with the local transfer of heat between intraovarian blood vessels (Hunter & Einer‐Jensen, ).…”

Section: The Female Reproductive Tractmentioning

confidence: 99%

Heat stress, a serious threat to reproductive function in animals and humans

Boni

2019

Molecular Reproduction Devel

106

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Global warming represents a major stressful environmental condition that compromises the reproductive efficiency of animals and humans via a rise of body temperature above its physiological homeothermic point (heat stress [HS]). The injuries caused by HS on reproductive function involves both male and female components, fertilization mechanisms as well as the early and late stages of embryofetal development. This occurrence causes great economic damage in livestock, and, in wild animals creates selective pressure towards the advantages of better-adapted genotypes to the detriment of others. Humans undergo several types of stress, including heat, and these represent putative causes of ongoing progressive decay in procreation; an increasing number of remedies in the form of antioxidant preparations are now being proposed to counteract the effects of stress. This review aims to describe the results of the most recent studies that aimed to highlight these effects and to draw information on the mechanisms acting as the basis of this problem from a comparative analysis. K E Y W O R D S follicle, global warming, heat stress, mitochondria, oocyte, reproductive activity, spermatozoa Mol Reprod Dev. 2019;86:1307-1323.wileyonlinelibrary.com/journal/mrd

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Section: The Female Reproductive Tractmentioning

confidence: 99%

Heat stress, a serious threat to reproductive function in animals and humans

Boni

2019

Molecular Reproduction Devel

106

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“…In previous studies, body temperature, ovarian temperature, and uterine and vaginal temperatures have been associated with fertility success, especially ovulation efficiency. The mean follicular fluid temperature in preovulatory follicles was lower than the temperatures of both the uterine surface and rectum in ovulating cows, whereas no such difference in temperature was detected in non-ovulating cows [7][8][9].…”

mentioning

confidence: 99%

Establishment of long-term chronic recording technique of <i>in vivo</i> ovarian parenchymal temperature in Japanese Black cows

Morita

Ozaki

Mukaiyama

et al. 2020

Journal of Reproduction and Development

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The reproductive performance of cattle can be suppressed by heat stress. Reproductive organ temperature, especially ovarian temperature, may affect follicle development and ovulation. The establishment of a technique for long-term measurement of ovarian temperature could prove useful in understanding the mechanisms underlying the temperature-dependent changes in follicular development and subsequent ovulation in cows. Here we report a novel method facilitating long-term and continuous recording of ovarian parenchymal temperature in cows. The method revealed that the ovarian temperature in the luteal phase was constantly maintained lower than the vaginal temperature, and that the diurnal temperature variation in the ovary was significantly greater than that in the vagina, suggesting that the ovaries may require a lower temperature than other organs to maintain their functions. This novel method could be used for the further understanding of ovarian functions during estrous cycles in cows.

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“…Although these points do not alter the overall conclusion drawn from these studies, they are relevant to any proposed explanations for the mechanism(s) underlying the lowering of follicular temperature. They may also be relevant to interpretations of this unusual component of ovarian physiology when attempting to place the phenomenon in an evolutionary context [6].…”

mentioning

confidence: 99%

Pre-ovulatory follicular temperature in bi-ovular cows

López‐Gatius

Hunter

2019

J. Reprod. Dev.

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In a previous study on monovular cows, follicles revealed a mean antral (follicular fluid) temperature 1.54°C cooler than rectal temperatures in ovulating cows, whereas no such temperature differences were detected in non-ovulating cows. The present study adds to our previous work, this time considering 24 bi-ovular cows (one follicle per ovary). In order to increase the number of pre-ovulatory follicles failing to ovulate, this study was performed under heat-stress conditions. Follicular temperatures of the ovulating follicles (n = 31) were 0.93°C significantly cooler (P < 0.0001) than rectal temperatures, whereas no significant differences in temperature were found in non-ovulating follicles (n = 17). Eight cows became pregnant. The results of the present study indicate that, similar to those in monovular cows, pre-ovulatory follicles in bi-ovular cows were cooler than deep rectal temperatures and those temperature gradients were not found in follicles showing ovulation failure.

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Temperature gradients in vivo influence maturing male and female gametes in mammals: evidence from the cow

Cited by 13 publications

References 33 publications

Heat stress, a serious threat to reproductive function in animals and humans

Heat stress, a serious threat to reproductive function in animals and humans

Establishment of long-term chronic recording technique of <i>in vivo</i> ovarian parenchymal temperature in Japanese Black cows

Pre-ovulatory follicular temperature in bi-ovular cows

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