Hypogonadism in Heat Stressed Goats: Poor Responsiveness of the Ovary to the Pulsatile LH Stimulation Induced by Hourly Injections of a Small Dose of GnRH.

Kanai, Yoshikatsu; Yagyu, Noritoshi; Shimizu, Takashi

doi:10.1262/jrd.41.133

Cited by 9 publications

(9 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Cultured follicular cells experience reduced steroid production at elevated temperature, at least in cattle (Wolfenson et al 1997;Bridges et al 2005). Also, follicular responsiveness to LH, as measured by oestradiol release after injection of gonadotropin releasing hormone injection, was reduced by heat stress in goats (Kanai et al 1995). Heat stress can reduce LH secretion (Schillo et al 1978;Wise et al 1988).…”

Section: The Female (A) the Oocytementioning

confidence: 99%

Effects of heat stress on mammalian reproduction

Hansen

2009

Phil. Trans. R. Soc. B

564

417

View full text Add to dashboard Cite

Heat stress can have large effects on most aspects of reproductive function in mammals. These include disruptions in spermatogenesis and oocyte development, oocyte maturation, early embryonic development, foetal and placental growth and lactation. These deleterious effects of heat stress are the result of either the hyperthermia associated with heat stress or the physiological adjustments made by the heat-stressed animal to regulate body temperature. Many effects of elevated temperature on gametes and the early embryo involve increased production of reactive oxygen species. Genetic adaptation to heat stress is possible both with respect to regulation of body temperature and cellular resistance to elevated temperature.

show abstract

Section: The Female (A) the Oocytementioning

confidence: 99%

Effects of heat stress on mammalian reproduction

Hansen

2009

Phil. Trans. R. Soc. B

564

417

View full text Add to dashboard Cite

show abstract

“…In the goat, HS decreases ovarian LH receptors (Ozawa et al . 2005) and HS reduces follicular responsiveness to LH (Kanai et al . 1995).…”

Section: Effects Of Heat Stress On Conception Ratesmentioning

confidence: 99%

“…1993). Female goats under HS have a suppressed LH surge response to gonadotropin‐releasing hormone (GnRH) (Kanai et al . 1995).…”

Section: Effects Of Heat Stress On Estrus Detectionmentioning

confidence: 99%

“…Plasma concentrations of progesterone and luteinizing hormone (LH) can decrease during the summer in dairy cows . In the goat, HS decreases ovarian LH receptors (Ozawa et al 2005) and HS reduces follicular responsiveness to LH (Kanai et al 1995). Heat stress reduces circulating concentrations of inhibin and increases follicle stimulating hormone secretion .…”

Section: Effects Of Heat Stress On Conception Ratesmentioning

confidence: 99%

“…Pulsatile LH secretion, which is important to stimulate estradiol-17b secretion, is suppressed in dairy cows during summer (Gilad et al 1993). Female goats under HS have a suppressed LH surge response to gonadotropin-releasing hormone (GnRH) (Kanai et al 1995). A reduction in the LH preovulatory surge could conceivably lead to delayed ovulation (Siddiqui et al 2010).…”

Section: Effects Of Heat Stress On Estrus Detectionmentioning

confidence: 99%

See 2 more Smart Citations

Perspectives on improvement of reproduction in cattle during heat stress in a future Japan

Kadokawa

Sakatani

Hansen

2012

Animal Science Journal

View full text Add to dashboard Cite

Heat stress (HS) causes hyperthermia, and at its most severe form, can lead to death. More commonly, HS reduces feed intake, milk yield, growth rate and reproductive function in many mammals and birds, including the important cattle breeds in Japan. Rectal temperatures greater than 39.0°C and respiration rates greater than 60/min indicate cows are undergoing HS sufficient to affect milk yield and fertility. HS compromises oocyte quality and embryonic development, reduces expression of estrus and changes secretion of several reproductive hormones. One of the most effective ways to reduce the magnitude of HS is embryo transfer, which bypasses the inhibitory effects of HS on the oocyte and early embryo. It may also be possible to select for genetic resistance to HS. Cooling can also improve reproductive performance in cows and heifers, and probably, the most effective cooling systems currently in use are those that couple evaporative cooling with tunnel ventilation or cross ventilation. Its effect on improving reproductive performance in Japan remains to be evaluated.

show abstract

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

Boni

2019

Molecular Reproduction Devel

View full text Add to dashboard Cite

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

show abstract

Hypogonadism in Heat Stressed Goats: Poor Responsiveness of the Ovary to the Pulsatile LH Stimulation Induced by Hourly Injections of a Small Dose of GnRH.

Cited by 9 publications

References 32 publications

Effects of heat stress on mammalian reproduction

Effects of heat stress on mammalian reproduction

Perspectives on improvement of reproduction in cattle during heat stress in a future Japan

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

Contact Info

Product

Resources

About