Milk production, mortality, and economic parameters in the context of heat-stressed dairy cattle

Vriezen, Rachael; Vriezen, Ellen R.; Cranfield, John

doi:10.1079/pavsnnr202116062

Cited by 4 publications

(3 citation statements)

References 47 publications

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“…Although heat stress has been recognized as an important factor in dairy production, proportionally few studies have assessed its economic impact Vriezen et al 2021). In addition, animal welfare has become an important element of sustainable production that has evolved along with the transformation of animal production systems (Vargas-Bello-Pérez et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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

Árias

Keim²,

Pinto³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The intricate interplay of genetics, nutrition, management practices, and environmental factors directly influences dairy cow performance and farm profitability. Among these factors, nutrition is a critical determinant of dairy cow health, milk production, and economic viability (Vriezen et al, 2021). Nutritional interventions in dairy farming encompass a broad spectrum of strategies aimed at enhancing the quality and efficiency of nutrient utilization by dairy cows.…”

Section: Introductionmentioning

confidence: 99%

Nutritional Interventions on Dairy Performance and Profitability

ANWAR,

TARIQ,

USMAN

et al. 2023

Biol Clin Sci Res J

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Dairy production plays a pivotal role in meeting the global demand for high-quality milk and dairy products, which are essential sources of nutrition for populations worldwide. The primary aim of the study is to find the nutritional interventions on dairy performance and profitability. This research article follows a controlled experimental design to assess the impact of specific dietary interventions on dairy performance and profitability. The study was conducted at a commercial dairy farm, and data were collected over 12 months.The study utilized 120 lactating Holstein dairy cows from the commercial herd. Cows were selected based on similar lactation stages, parity, and health status to minimize potential confounding factors. The experimental Group 1, which received the custom-blend dietary supplements, showed a significant increase in daily milk yield compared to the Control Group (P < 0.05). On average, cows in Group 1 produced 2.5 liters more milk daily. It is concluded that improved milk production and profitability, achieved without compromising health or welfare, underscores the importance of optimizing nutrition for dairy cows. These findings contribute to the evolving field of dairy nutrition and have practical implications for enhancing dairy farm sustainability and economic viability.

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“…Based on a meta-analysis conducted by Vriezen et al (2021), it was observed that the number of studies concerning an economic analysis of HS in dairy cattle is scarce. The range of losses in milk production conditions is difficult to estimate, as consequences of HS are usually masked by other factors, such as lactation, breed or age of animals (Mayer et al, 1999); furthermore, production systems, climate conditions, and market requirements differ.…”

mentioning

confidence: 99%

Thermal stress influence on the productive and economic effectiveness of Holstein-Friesian dairy cows in temperate climate

Sowula-Skrzyñska

Borecka

et al. 2023

Annals of Animal Science

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The aim of this study was to evaluate the heat stress influence of milk production from primiparous and multiparous Holstein Friesian cows and to estimate economic losses associated with the decrease in the farm’s milk yield. The cows selected for the study were in the middle phase of the 1st, 2nd, and 3rd lactation and were characterised by similar daily milk production. Additionally, the animals were kept in the same conditions and fed with the same feeds throughout the season. The analysis covered two 30-day periods – ‘cold’ (April), in which no days with THI >70 were noted, and ‘hot’ (July), in which THI was above 70 for 90% of the days (74.4 on average). The average daily drop in milk production noted in the hot period was 1.25 kg/cow for multiparous cows and 2.78 kg/cow for primiparous cows. The average daily financial loss resulting from a drop in milk production was €0.55/day/cow in primiparous and €0.46/day/cow in multiparous animals. The calculated daily loss in the profit on production of 1 kg of milk was €0.27/day/kg for primiparous and €0.24/day/kg for multiparous animals. Based on test results, economic losses were simulated depending on the daily milk yield and the size of the primary cattle herd. For the multiparous cows, the estimated losses ranged from €6.07/day (farm sizes 25 cows and average daily milk yield 25kg) to nearly €219/day (900cows/ 25kg). In larger facilities (900 cows) with an average daily milk yield of 55 kg, the daily loss will be about €481. The obtained results confirmed the assumptions made that with a change in microclimate conditions in the barn, a decrease in the daily production and changes in the milk chemical composition were noted, and the economic efficiency of the studied activity decreased.

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Milk production, mortality, and economic parameters in the context of heat-stressed dairy cattle

Cited by 4 publications

References 47 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

Nutritional Interventions on Dairy Performance and Profitability

Thermal stress influence on the productive and economic effectiveness of Holstein-Friesian dairy cows in temperate climate

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