Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions

Heat stress strongly negatively affects reproductive traits in dairy cattle. The purpose of the present study was to investigate the effect of heat stress in superstimulated Thai-Holstein crossbreds under tropical climate conditions. Data included 75 records from 12 superovulated Thai-Holstein cross...

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Autores principales:	Ruthaiporn Ratchamak, Thanaporn Ratsiri, Rujira Chumchai, Wuttigrai Boonkum, Vibuntita Chankitisakul
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	heat stress superovulation threshold point Veterinary medicine SF600-1100
Acceso en línea:	https://doaj.org/article/de072629fc864837a63c7a61806fea80
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spelling	oai:doaj.org-article:de072629fc864837a63c7a61806fea802021-11-25T19:12:02ZRelationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions10.3390/vetsci81102702306-7381https://doaj.org/article/de072629fc864837a63c7a61806fea802021-11-01T00:00:00Zhttps://www.mdpi.com/2306-7381/8/11/270https://doaj.org/toc/2306-7381Heat stress strongly negatively affects reproductive traits in dairy cattle. The purpose of the present study was to investigate the effect of heat stress in superstimulated Thai-Holstein crossbreds under tropical climate conditions. Data included 75 records from 12 superovulated Thai-Holstein crossbreds between 2018 and 2020. Cows were superstimulated with conventional treatment. The mean temperature-humidity index (THI) was evaluated for three data collection periods: during the 9, 21 and 42-day periods before the insemination day to determine the period in which THI mostly affected superstimulation responses. The THI levels/thresholds were determined and interpreted together with the superovulatory response. A significantly negative correlation was obtained for the THI during the period 9 days before insemination. Negative effects on the number of large follicles and corpora lutea began at a THI of 72 and were apparently severe after a THI of 77, similar to the ovulation rate, fertilized ova and transferable embryos (<i>p</i> < 0.05). Meanwhile, more degenerated embryos were found with THI values (<i>p</i> < 0.05). The superovulatory response in Thai-Holstein crossbreds under tropical climate conditions is highly affected by heat stress starting at a THI of 72 and becomes more severe at a THI higher than 77.Ruthaiporn RatchamakThanaporn RatsiriRujira ChumchaiWuttigrai BoonkumVibuntita ChankitisakulMDPI AGarticleheat stresssuperovulationthreshold pointVeterinary medicineSF600-1100ENVeterinary Sciences, Vol 8, Iss 270, p 270 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	heat stress superovulation threshold point Veterinary medicine SF600-1100
spellingShingle	heat stress superovulation threshold point Veterinary medicine SF600-1100 Ruthaiporn Ratchamak Thanaporn Ratsiri Rujira Chumchai Wuttigrai Boonkum Vibuntita Chankitisakul Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions
description	Heat stress strongly negatively affects reproductive traits in dairy cattle. The purpose of the present study was to investigate the effect of heat stress in superstimulated Thai-Holstein crossbreds under tropical climate conditions. Data included 75 records from 12 superovulated Thai-Holstein crossbreds between 2018 and 2020. Cows were superstimulated with conventional treatment. The mean temperature-humidity index (THI) was evaluated for three data collection periods: during the 9, 21 and 42-day periods before the insemination day to determine the period in which THI mostly affected superstimulation responses. The THI levels/thresholds were determined and interpreted together with the superovulatory response. A significantly negative correlation was obtained for the THI during the period 9 days before insemination. Negative effects on the number of large follicles and corpora lutea began at a THI of 72 and were apparently severe after a THI of 77, similar to the ovulation rate, fertilized ova and transferable embryos (<i>p</i> < 0.05). Meanwhile, more degenerated embryos were found with THI values (<i>p</i> < 0.05). The superovulatory response in Thai-Holstein crossbreds under tropical climate conditions is highly affected by heat stress starting at a THI of 72 and becomes more severe at a THI higher than 77.
format	article
author	Ruthaiporn Ratchamak Thanaporn Ratsiri Rujira Chumchai Wuttigrai Boonkum Vibuntita Chankitisakul
author_facet	Ruthaiporn Ratchamak Thanaporn Ratsiri Rujira Chumchai Wuttigrai Boonkum Vibuntita Chankitisakul
author_sort	Ruthaiporn Ratchamak
title	Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions
title_short	Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions
title_full	Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions
title_fullStr	Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions
title_full_unstemmed	Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions
title_sort	relationship of the temperature-humidity index (thi) with ovarian responses and embryo production in superovulated thai-holstein crossbreds under tropical climate conditions
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/de072629fc864837a63c7a61806fea80
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Relationship of the Temperature-Humidity Index (THI) with Ovarian Responses and Embryo Production in Superovulated Thai-Holstein Crossbreds under Tropical Climate Conditions

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