Modeling heat stress effects on dairy cattle milk production in a tropical environment using test-day records and random regression models

Mbuthia, Jackson M.; Mayer, M.; Reinsch, Norbert

doi:10.1016/j.animal.2021.100222

Cited by 26 publications

(21 citation statements)

References 30 publications

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“…This is not the first study that reported T a as an appropriate heat stress indicator for dairy cows. Similar results have been demonstrated in temperate climates (Kovács et al 2018;Li et al 2020;Tian et al 2021), Mediterranean climates (Davison et al 2020), tropical climates (Kabuga 1992;Mbuthia et al 2021), and subtropical climates (Dikmen and Hansen 2009;Ji et al 2020).…”

Section: Selection Of Heat Stress Indicatorssupporting

confidence: 85%

Evaluation of environmental and physiological indicators in lactating dairy cows exposed to heat stress

et al. 2022

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This study aimed to better understand environmental heat stress and physiological heat strain indicators in lactating dairy cows. Sixteen heat stress indicators were derived using microenvironmental parameters that were measured at the surrounding of cows and at usual fixed locations in the barn by using handheld and fixed subarea sensors, respectively. Twenty highproducing Holstein-Friesian dairy cows (> 30.0 kg/day) from an intensive dairy farm were chosen to measure respiration rate (RR), vaginal temperature (VT), and body surface temperature of forehead (FT), eye (ET), and muzzle (MT). Our results show that microenvironments measured by the handheld sensor were slightly warmer and drier than those measured by the fixed subarea sensor; however, their derived heat stress indicators correlated equally well with physiological indicators. Interestingly, ambient temperature (T a ) had the highest correlations with physiological indicators and the best classification performance in recognizing actual heat strain state. Using segmented mixed models, the determined T a thresholds for maximum FT,

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Section: Selection Of Heat Stress Indicatorssupporting

confidence: 85%

Evaluation of environmental and physiological indicators in lactating dairy cows exposed to heat stress

et al. 2022

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“…Esto lleva a determinar que el principal problema del ganado Bos taurus en el trópico es la muy baja tolerancia al estrés por calor, por lo que el calentamiento global hace que el manejo de este tipo de animal cada vez sea más difícil, ya que está estrechamente relacionado con la reproducción, además el estrés causa una deficiencia en los mecanismos de disipación del calor, donde se da una reducción del consumo de alimento, y al suministrar alimentos no podría ser eliminados de manera correcta en situaciones de estrés calórico. Sin embargo, existen métodos para disminuir este problema como la provisión de sombras, suministro de agua de calidad sin restricción, entre otros, pero estos se deben conocer más a fondo para lograr alternativas y seguir trabajando con animales que puedan expresar mayor productividad (2).…”

Section: Introductionunclassified

With or without trees: Resistance and resilience of soil microbial communities to drought and heat stress in a Mediterranean agroforestry system

Guillot

Hinsinger

Dufour

et al. 2019

Soil Biology and Biochemistry

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“…These are conditions that are favourable to thriving of tick-borne and non-tick borne disease infections [37] [38] [39].…”

Section: Discussionmentioning

confidence: 99%

Assessing Animal Disease Prevalence and Mortality in Smallholder Dairy Farms under Contrasting Management Practices and Stressful Environments in Tanzania

Shija¹,

Okeyo²,

Migwi³

et al. 2022

OJVM

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In dairy farming, deploying effective animal husbandry practices minimise disease infections and animal mortality. This improves animal health and welfare status, which is important in tropical smallholder dairy farming, where animals are persistently exposed to multiple environmental stresses. The hypothesis of this study was that animals managed in positive deviants and typical farms suffer different levels of disease infections and mortality, whether under low-or high-stress environments. The study adopted a two-factor nested design with farms contrasting in the level of animal husbandry (positive deviants and typical farms) nested within environments contrasting in the level of environmental stresses (low-and high-stress). A total of 1,999 animals were observed over 42 month period in the coastal lowlands and highlands of Tanzania. The disease prevalence was lower (p < 0.05) in positive deviant farms than in typical farms under low-stress (10.13 vs. 33.61 per 100 animal-years at risk) and high-stress (9.56 vs. 57.30 per 100 animal-years at risk). Cumulative disease incidence rate was also lower (p < 0.05) in positive deviant farms than in typical farms under low-stress (2.74% vs. 8.44%) and high-stress (2.58% vs. 14.34%). The probability of death for a disease infected dairy cattle was relatively lower in positive deviant farms compared to typical farms under low-stress (0.57% vs. 8.33%) and high-stress (0.60% vs. 6.99%). Per 100 animal-years at risk, the mortality density of cattle was lower (p < 0.05) in positive deviant farms compared to typical farms, 15.10 lower in low-stress and 2.60 lower in high-stress. These results show that compared to typical farms, positive deviant farms consistently attained

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Modeling heat stress effects on dairy cattle milk production in a tropical environment using test-day records and random regression models

Cited by 26 publications

References 30 publications

Evaluation of environmental and physiological indicators in lactating dairy cows exposed to heat stress

Evaluation of environmental and physiological indicators in lactating dairy cows exposed to heat stress

With or without trees: Resistance and resilience of soil microbial communities to drought and heat stress in a Mediterranean agroforestry system

Assessing Animal Disease Prevalence and Mortality in Smallholder Dairy Farms under Contrasting Management Practices and Stressful Environments in Tanzania

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