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Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate

Heat stress is a major challenge in dairy cattle farming and leads to economic losses. This study aims to determine the impact of heat stress on dairy cattle under a hot and humid climate. Milk yield test records between 2015 to 2019 were collected from 532 first lactating Friesian crossbred cows. H...

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Main Authors: Michael, Predith, de Cruz, Clement Roy, Mohd Nor, Norhariani, Jamli, Saadiah, Goh, Yong Meng
Format: Article
Published: Springer 2023
Online Access:http://psasir.upm.edu.my/id/eprint/107787/
https://link.springer.com/article/10.1007/s00704-023-04549-3?error=cookies_not_supported&code=c4962c86-1fcc-4b6b-9da3-741b3b0f1770
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spelling my.upm.eprints.1077872024-08-19T02:02:29Z http://psasir.upm.edu.my/id/eprint/107787/ Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate Michael, Predith de Cruz, Clement Roy Mohd Nor, Norhariani Jamli, Saadiah Goh, Yong Meng Heat stress is a major challenge in dairy cattle farming and leads to economic losses. This study aims to determine the impact of heat stress on dairy cattle under a hot and humid climate. Milk yield test records between 2015 to 2019 were collected from 532 first lactating Friesian crossbred cows. Hourly values of temperature (dry bulb), relative humidity, surface wind speed, and solar radiation over 24 h collected from the national weather station in Malaysia were averaged and computed into four temperature indexes (TI). The heat stress threshold was identified using a two-slope broken line regression and the magnitude of milk loss was determined by the degree of decline fitted to a Legendre polynomial regression. Environmental parameters and TI values were observed to be influenced by the dry and monsoon season. Thresholds reported ranged between 73 (TI4) to 79 (TI3) according to the respective TI measured. The index values were higher than the reported studies in temperate, semi-arid and mediterranean climates. The largest milk decline was determined as 0.181 kg in mild, 0.267 kg in moderate, and 0.523 kg in extreme heat stress conditions, respectively, when using the conventional TI1. Thresholds determined in the current study can be used for annual forecasting and targeted heat stress mitigation efforts. Springer 2023 Article PeerReviewed Michael, Predith and de Cruz, Clement Roy and Mohd Nor, Norhariani and Jamli, Saadiah and Goh, Yong Meng (2023) Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate. Theoretical and Applied Climatology, 154. pp. 235-244. ISSN 0177-798X; EISSN: 1434-4483 https://link.springer.com/article/10.1007/s00704-023-04549-3?error=cookies_not_supported&code=c4962c86-1fcc-4b6b-9da3-741b3b0f1770 10.1007/s00704-023-04549-3
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
description Heat stress is a major challenge in dairy cattle farming and leads to economic losses. This study aims to determine the impact of heat stress on dairy cattle under a hot and humid climate. Milk yield test records between 2015 to 2019 were collected from 532 first lactating Friesian crossbred cows. Hourly values of temperature (dry bulb), relative humidity, surface wind speed, and solar radiation over 24 h collected from the national weather station in Malaysia were averaged and computed into four temperature indexes (TI). The heat stress threshold was identified using a two-slope broken line regression and the magnitude of milk loss was determined by the degree of decline fitted to a Legendre polynomial regression. Environmental parameters and TI values were observed to be influenced by the dry and monsoon season. Thresholds reported ranged between 73 (TI4) to 79 (TI3) according to the respective TI measured. The index values were higher than the reported studies in temperate, semi-arid and mediterranean climates. The largest milk decline was determined as 0.181 kg in mild, 0.267 kg in moderate, and 0.523 kg in extreme heat stress conditions, respectively, when using the conventional TI1. Thresholds determined in the current study can be used for annual forecasting and targeted heat stress mitigation efforts.
format Article
author Michael, Predith
de Cruz, Clement Roy
Mohd Nor, Norhariani
Jamli, Saadiah
Goh, Yong Meng
spellingShingle Michael, Predith
de Cruz, Clement Roy
Mohd Nor, Norhariani
Jamli, Saadiah
Goh, Yong Meng
Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
author_facet Michael, Predith
de Cruz, Clement Roy
Mohd Nor, Norhariani
Jamli, Saadiah
Goh, Yong Meng
author_sort Michael, Predith
title Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
title_short Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
title_full Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
title_fullStr Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
title_full_unstemmed Evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
title_sort evaluation of heat stress threshold and impacts on milk yield in dairy cattle crossbreds in a hot and humid climate
publisher Springer
publishDate 2023
url http://psasir.upm.edu.my/id/eprint/107787/
https://link.springer.com/article/10.1007/s00704-023-04549-3?error=cookies_not_supported&code=c4962c86-1fcc-4b6b-9da3-741b3b0f1770
_version_ 1809142963135053824
score 13.211869

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