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- W3033293723 abstract "Heat stress (HS) has a pronounced deleterious effect on fertility in dairy herds throughout the world, especially in hot and humid summer months in tropical and subtropical areas. Summer HS reduces feed intake and increases negative energy balance, induces changes in ovarian follicular dynamics, reduces estrus detection rates and alters oviductal function leading to fertilization failure and early embryonic death. Furthermore, oocytes harvested from lactating cows during summer HS have a decreased ability to develop to the blastocyst stage after in vitro fertilization when compared with oocytes harvested during winter. The present manuscript describes the detrimental effect of HS on reproduction, with emphasis on preovulatory oocytes and carry over effects of HS on embryo development and P/AI. Embryo transfer (ET) has been an effective tool to reestablish fertility during HS because it bypasses the damage to the oocyte and early embryo caused by hyperthermia. Therefore, a management strategy to maintain increased fertility throughout the year would be to produce embryos during the cooler months, when oocyte quality is greater, and use them to produce pregnancies during the periods of HS, when oocyte quality is compromised. However, this strategy only can be implemented using cryopreserved embryos, what is still limiting. During the warmer months, the use of heifers or non-lactating cows as oocyte or embryo donors may facilitate embryo production, mainly because of the lesser deleterious effects of HS comparing to lactating cows. Also, genetic selection of donors for thermoregulation ability is one potential strategy to mitigate effects of HS and increase embryo production during the warmer months. These alternatives enable the transference of fresh embryos with more efficiency during HS periods. Additionally, the application of timed ET protocols, which avoid the need for estrus detection in recipients, has facilitated management and improved the efficiency of ET programs during HS." @default.
- W3033293723 created "2020-06-12" @default.
- W3033293723 creator A5011329056 @default.
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- W3033293723 creator A5048307365 @default.
- W3033293723 creator A5071822419 @default.
- W3033293723 creator A5090539955 @default.
- W3033293723 date "2020-10-01" @default.
- W3033293723 modified "2023-10-17" @default.
- W3033293723 title "Use of embryo transfer to alleviate infertility caused by heat stress" @default.
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- W3033293723 doi "https://doi.org/10.1016/j.theriogenology.2020.04.028" @default.
- W3033293723 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32562738" @default.
- W3033293723 hasPublicationYear "2020" @default.