Estimating milk production losses by heat stress and its impacts on
                    greenhouse gas emissions in Korean dairy farms

Park, Geun-woo; Ataallahi, Mohammad; Ham, Seon Yong; Oh, Sejong; Kim, Ki-Youn; Park, Kyu Hyun

doi:10.5187/jast.2022.e134

Cited by 11 publications

(11 citation statements)

References 30 publications

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“…Finally, the overall impact on milk production in the country is estimated at 2.68% and 10.02%, either using THI or THIa, respectively. These values are similar to those reported for three regions in Korea using THI(Park et al 2022). Martinsohn and Hansen (2012) reported that worldwide, only a narrow range of geographical and climatic zones has been considered regarding climate change impacts on the economics of dairy farming.The authors added that most studies dealing with climate change and dairy farming analyses either direct or indirect impacts.…”

supporting

confidence: 90%

Estimation of the economic impact of heat stress on dairy production systems in Chile

Árias

Keim²,

Pinto³

et al. 2023

Preprint

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The estimation of the economic impact of heat stress on the dairy sector is relevant to the implementation of policies to cope with it. We collected hourly records (November-March 2017–2022) from 19 weather stations representing the eight Chilean dairy macrozones to estimate two comfort thermal indices: the temperature-humidity index (THI) and the THI adjusted for solar radiation and wind speed (THIa). The economic impact was estimated considering the losses on milk yield, days open, culling rate, and deaths based on international previous work using a critical threshold of 65. There were important differences in the number of hours above the threshold among dairy production macrozones, independent of the thermal index used. The greatest values were observed in macrozones I, II, and VIII, where most of the dairy cows are located. Average losses in milk yield were between 1.75 to 6.09 times higher when THIa was used instead of THI, which also depends on the macrozone. These estimations coincide with those reported by dairy producers. Thus, the THI would be underestimating the decrease in milk yield due to heat stress. The lowest average economic losses per cow/season, 5 seasons average, occurred in macrozone VI (US$ 463.4), and the highest losses were observed in macrozone I (US $1161.4) both using THIa. Thus, losses at the country level fluctuate between US$ 29.0 and 108.4 million per season, depending on the index used. Finally, heat stress impacts negatively and significantly the Chilean dairy sector, which is highly dependent on the dairy production macrozone.

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supporting

confidence: 90%

Estimation of the economic impact of heat stress on dairy production systems in Chile

Árias

Keim²,

Pinto³

et al. 2023

Preprint

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“…Cows in this range have been reported to exhibit increased saliva production, respiration rate, water consumption, body temperature, and decreased feed intake. Studies have reported reduced milk protein, milk fat, and SNF levels due to heat stress [ 33 , 34 , 35 ]. Bohmanova et al [ 19 ] suggested that the decrease in milk components such as milk protein and milk fat, due to heat stress could be attributed to the dilution effect caused by decreased feed intake and increased water consumption.…”

Section: Resultsmentioning

confidence: 99%

Impact of Climate Change and Heat Stress on Milk Production in Korean Holstein Cows: A Large-Scale Data Analysis

Jeon,

Jang,

Yeo

et al. 2023

Animals

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This study investigated the effects of heat stress on milk production in Korean Holstein cows using large-scale data. Heat stress was assessed using the temperature-humidity index (THI). Weather records (2016 to 2020) were collected from 70 regional weather stations using an installed automated surface observing system (ASOS). A dataset of 2,094,436 milk production records from 215,276 Holstein cows obtained from the Dairy Cattle Genetic Improvement Center was analyzed. Stepwise selection was used to select the input variables, including the daily maximum THI (THI_max). Least-squares means were calculated for milk yield, fat and protein corrected milk (FPCM), fat and protein yield, fat-to-protein ratio, solids not fat, and lactation persistency. Segmented linear regression analysis determined the break points (BPs) of the THI_max. Over the five years, heat stress exposure increased, particularly from May to September. This study identified BPs around THI_max of 80–82 for milk yield and FPCM. Similar patterns for other milk traits were observed, which significantly decreased beyond their respective BPs. These findings indicate that THI variations adversely affect milk yield and composition in dairy cows, highlighting the importance of appropriate feeding management strategies to ensure the optimal productivity of Holstein cows under varying climatic conditions.

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“…improve the EB in the early period. To support these results, additional research will be needed in heat stress-associated consideration of the appropriate length of the dry period, party, and additives for milk production of dairy cows as well as greenhouse gas emission in the research of dairy science [34,35,36]. A C Ta = air temperature; RH = relative humidity; THI = temperature and humidity index.…”

Section: Discussionmentioning

confidence: 99%

Effects of dry period length on milk production and physiological responses of heat-stressed dairy cows during the transition period

Lim¹,

Jung²,

Ki³

et al. 2023

J Anim Sci Technol

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The objective of this study was to investigate the effects of a traditional dry period (60 d) versus a no dry period (0 d) on the milk production, physiological response, and metabolic status of dairy cows exposed to heat stress during the transition period. Holstein dairy cows (n = 15) with similar expected calving dates were randomly assigned to two different dry period lengths: (1) no dry period (n = 7) and(2) a traditional dry period of 60 days (n = 8). All cows were studied from 8 weeks before expected calving to 10 weeks after calving and experienced heat stress during the transition period. The results showed that cows with no dry period decreased their milk yield in subsequent lactation, but compensated for the loss of milk yield accounted for by additional milk yield before calving. The energy balance at postpartum was improved in cows with no dry period compared to cows with a traditional dry period. There were no significant differences in the physiological response and blood metabolites at postpartum between the dry period lengths of dairy cows exposed to heat stress during the transition period. Taken together, our results showed that omitting the dry period improved the milk production and metabolic status of dairy cows exposed to heat stress during the transition period.

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Estimating milk production losses by heat stress and its impacts on greenhouse gas emissions in Korean dairy farms

Cited by 11 publications

References 30 publications

Estimation of the economic impact of heat stress on dairy production systems in Chile

Estimation of the economic impact of heat stress on dairy production systems in Chile

Impact of Climate Change and Heat Stress on Milk Production in Korean Holstein Cows: A Large-Scale Data Analysis

Effects of dry period length on milk production and physiological responses of heat-stressed dairy cows during the transition period

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