Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows

Abstract Objective was to elucidate the effects of heat stress (HS) on embryo development during first 16 gestational days (GD) and circulating hormone concentrations on GD-16 in lactating Holstein cows. Cows in HS and control (CON) groups were exposed to temperature humidity index (THI) of ≥ 73 and...

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Autores principales:	Ramanathan Kasimanickam, Vanmathy Kasimanickam
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/56999eb986934b39a232d68c02e2558d
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spelling	oai:doaj.org-article:56999eb986934b39a232d68c02e2558d2021-12-02T17:03:50ZImpact of heat stress on embryonic development during first 16 days of gestation in dairy cows10.1038/s41598-021-94278-22045-2322https://doaj.org/article/56999eb986934b39a232d68c02e2558d2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94278-2https://doaj.org/toc/2045-2322Abstract Objective was to elucidate the effects of heat stress (HS) on embryo development during first 16 gestational days (GD) and circulating hormone concentrations on GD-16 in lactating Holstein cows. Cows in HS and control (CON) groups were exposed to temperature humidity index (THI) of ≥ 73 and < 73, respectively, for 3 weeks before the experiment. GD-7 (67 vs 49%) and GD-16 (52 vs. 31%) conception rates following single insemination were greater (P < 0.01) for CON compared with HS cows. Control cows produced more GD-7 transferrable embryos following superovulation compared with HS cows (84.8 vs 53.1%; P < 0.001). Mean (± SEM) length (45.2 ± 10.6 vs. 59.2 ± 9.1 mm) and weight (31.4 ± 4.3 vs. 42.4 ± 6.2 mg) of GD-16 conceptus were greater for CON compared with HS cows (P < 0.05). Control cows yielded more filamentous conceptus (≥ 25 mm) compared with HS cows (71 vs 45%; P < 0.05). Progesterone (2.09-fold) was higher, and cortisol (1.86-fold), prolactin (1.60-fold), substance-P (1.55-fold), Isoprostane-8 (1.34-fold) and prostaglandin F metabolites (1.97-fold) were lower in CON compared with HS cows (P < 0.05). Progesterone positively, and substance-P, isoprostane-8 and the THI negatively were associated with GD-16 conceptus length (P < 0.05). In conclusion, altered hormones concentrations in heat-stressed cows plausibly resulted in lower GD-7 and GD-16 conception rates, fewer GD-7 transferable embryos, and stunted GD-16 conceptus elongation.Ramanathan KasimanickamVanmathy KasimanickamNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ramanathan Kasimanickam Vanmathy Kasimanickam Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
description	Abstract Objective was to elucidate the effects of heat stress (HS) on embryo development during first 16 gestational days (GD) and circulating hormone concentrations on GD-16 in lactating Holstein cows. Cows in HS and control (CON) groups were exposed to temperature humidity index (THI) of ≥ 73 and < 73, respectively, for 3 weeks before the experiment. GD-7 (67 vs 49%) and GD-16 (52 vs. 31%) conception rates following single insemination were greater (P < 0.01) for CON compared with HS cows. Control cows produced more GD-7 transferrable embryos following superovulation compared with HS cows (84.8 vs 53.1%; P < 0.001). Mean (± SEM) length (45.2 ± 10.6 vs. 59.2 ± 9.1 mm) and weight (31.4 ± 4.3 vs. 42.4 ± 6.2 mg) of GD-16 conceptus were greater for CON compared with HS cows (P < 0.05). Control cows yielded more filamentous conceptus (≥ 25 mm) compared with HS cows (71 vs 45%; P < 0.05). Progesterone (2.09-fold) was higher, and cortisol (1.86-fold), prolactin (1.60-fold), substance-P (1.55-fold), Isoprostane-8 (1.34-fold) and prostaglandin F metabolites (1.97-fold) were lower in CON compared with HS cows (P < 0.05). Progesterone positively, and substance-P, isoprostane-8 and the THI negatively were associated with GD-16 conceptus length (P < 0.05). In conclusion, altered hormones concentrations in heat-stressed cows plausibly resulted in lower GD-7 and GD-16 conception rates, fewer GD-7 transferable embryos, and stunted GD-16 conceptus elongation.
format	article
author	Ramanathan Kasimanickam Vanmathy Kasimanickam
author_facet	Ramanathan Kasimanickam Vanmathy Kasimanickam
author_sort	Ramanathan Kasimanickam
title	Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
title_short	Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
title_full	Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
title_fullStr	Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
title_full_unstemmed	Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
title_sort	impact of heat stress on embryonic development during first 16 days of gestation in dairy cows
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/56999eb986934b39a232d68c02e2558d
work_keys_str_mv	AT ramanathankasimanickam impactofheatstressonembryonicdevelopmentduringfirst16daysofgestationindairycows AT vanmathykasimanickam impactofheatstressonembryonicdevelopmentduringfirst16daysofgestationindairycows
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Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows

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