Impact of heat stress on lactational performance of dairy cows

Tao, Sha; Rivas, Ruth M. Orellana; Marins, Thiago N.; Chen, Yun-Chu; Gao, Jing; Bernard, J.K.

doi:10.1016/j.theriogenology.2020.02.048

Cited by 116 publications

(94 citation statements)

References 69 publications

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“…For example, Tullo et al (13) found that cows commonly lie down for about 9-14 h/day when reared indoors, while Lovarelli et al (14) showed that seasonality affects the lying time, in particular that the monitored cows lie down for a longer period in the cold season (on average 12.06 h/day) than in summer (on average 10.04 h/day). This supports also the findings in which a lower lying time is related to high THI conditions and in which high THI is associated with lower feed intake, lower milk production, and variations in behavior (9,11,17,25,26). Such a result was also obtained in this study, where it was found that one of the factors affecting lying time is seasonality and where the lactation stage (DIM), illuminance, THI, BCS, and milk production are the most relevant factors.…”

Section: Discussionsupporting

confidence: 91%

Relating Lying Behavior With Climate, Body Condition Score, and Milk Production in Dairy Cows

et al. 2020

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Attention on animal behavior and welfare has been increasing. Scientific knowledge about the effect of behavior and welfare on animals' production augmented and made clear the need of improving their living conditions. Among the variables to monitor in dairy cattle farming, lying time represents a signal for health and welfare status as well as for milk production. The aim of this study is to identify the relationship among the lying behavior of dairy cows and milk production, body condition score (BCS), weather variables, and the temperature-humidity index (THI) in the barn from a dairy farm located in Northern Italy. One-year data were collected on this farm with sensors that allowed monitoring of the environmental conditions in the barn and the activity of primiparous lactating cows. Principal components analysis (PCA), factor analysis (FA), generalized linear model select (GLMSelect), and logistic analysis (LA) were carried out to get the relationships among variables. Among the main results, it emerges that the effect of weather parameters is quite restrained, except for THI > 70, which negatively affects the lying time. In addition, the most productive cows are found to lie down more than the less productive ones, and the parameters of milk production, lying time, and BCS are found to be linked by a similar trend.

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Section: Discussionsupporting

confidence: 91%

Relating Lying Behavior With Climate, Body Condition Score, and Milk Production in Dairy Cows

et al. 2020

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“…Heat stress remains one of the most important factors that limit the production and welfare of dairy cattle (TAO et al, 2020). These animals experience situations of heat stress when any of these combinations of environmental conditions (temperature, relative humidity, solar radiation, wind and precipitation) make the effective temperature of the environment to exceed the thermoneutrality zone (ARMSTRONG, 1994;TAO et al, 2020). That way, high production dairy cows under heat stress have their homeostasis challenged, and changes in their performance are commonly observed due to the direct and indirect effects involved in thermal regulation, energy balance and endocrine changes (MARTELLO, 2004).…”

Section: Resultsmentioning

confidence: 99%

“…Milk production is a parameter that can be directly related to the animals' sensitivity to thermal stress, since the processes involved in lactation are responsible for great heat generation (KADZERE, 2002;TAO et al, 2020). This way, the biggest challenge for high production cows, kept in hot climates, is to dissipate the heat produced by metabolic processes (MARTELLO, 2004).…”

Section: Resultsmentioning

confidence: 99%

“…The productivity and well-being of dairy cows can be affected by high temperatures combined with high air humidity, one of the main effects of stress caused by climatic conditions is the reduction of milk production (ROENFELDT, 1998;TAO et al, 2020). It is estimated that in the United States this reduction can reach up to 35% (ST-PIERRE et al, 2003), and even in milder heat stress situations the losses are considerable, reaching 8,3% (OMINSKI et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Protected niacin and chromium-enriched yeast effect in dairy cows under heat stress: behavioral parameters

Leal¹,

Aires²,

Collet³

et al. 2020

Rev Agr Acad

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“…Cows under the HS condition suffer from the increased body temperature that exceeds the physiological limits. This can ultimately lead to impaired welfare and productive performance such as various diseases, decreased reproductive performance, reduced milk yield and even the death [6,9,10]. Cows with high genetic merit are more susceptible to HS which results in a signi cant economic loss for the dairy industry [11,12].…”

Section: Introductionmentioning

confidence: 99%

Genome-wide identification and functional prediction of circular RNAs in response to heat stress in Chinese Holstein cows

Zhen-shan

Guo

Wang

et al. 2021

Animal Biotechnology

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Background: Heat stress (HS) leads to substantial economic loss of dairy industry each year. The negative effect of HS in dairy cows is becoming one of the more urgent and important issue due to accelerating side-effects of global warming. At present, the best way to alleviate the effect of HS is breeding of thermotolerant cows which depends on the profound understanding of mechanism of HS.Various genes are involved in HS response but the information about the role of noncoding RNAs, especially circular RNAs (circRNAs) is largely unknown.Results: In our study, we aimed to investigate the different expression pro le of circRNAs between HS and normal condition (NC) of Chinese Holstein cow's mammary gland. CircRNAs were identi ed using RNA sequencing and bioinformatics analysis. In total, 37405 circRNAs were detected and 95 were differentially expressed (DE), including 15 downregulated and 80 upregulated circRNAs in HS group compared to NC. Eight circRNAs were randomly selected to verify the RNA sequencing result. Further, Sanger sequencing validated the backsplicing site of the eight circRNAs. Moreover, results obtained from the Quantitative real time PCR (qRT-PCR) showed consistent expression trend with that of RNA sequencing. GO annotation and KEGG analysis suggested that these DE circRNAs probably involved in the energy metabolic regulation. Furthermore, we constructed ceRNA network and the result indicated that these DE circRNAs could regulate lactation through IGF1 and PRL signaling pathway. Conclusion:During our study, it was evident that circRNAs were involved in regulation of HS response in Chinese Holstein cow's mammary gland. This will help researchers to achieve a better understanding of mechanism related to HS response and can provide new insights in breeding of thermotolerant dairy cows.

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Impact of heat stress on lactational performance of dairy cows

Cited by 116 publications

References 69 publications

Relating Lying Behavior With Climate, Body Condition Score, and Milk Production in Dairy Cows

Relating Lying Behavior With Climate, Body Condition Score, and Milk Production in Dairy Cows

Protected niacin and chromium-enriched yeast effect in dairy cows under heat stress: behavioral parameters

Genome-wide identification and functional prediction of circular RNAs in response to heat stress in Chinese Holstein cows

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