Acclimatization dynamics to extreme heat stress in crossbred cattle

Yadav, Brijesh; Singh, Gyanendra; Wankar, Alok

doi:10.1080/09291016.2019.1610627

Cited by 16 publications

(8 citation statements)

References 42 publications

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“…The results of present study revealed that intrinsic antioxidative defense system could minimize the increased ROS levels at a THI of 85. (Silva et al, 2014;Yadav et al, 2021b), and prolactin (Roy and Prakash, 2007). The results of present study suggested that hormonal acclamatory responses were required only at a THI beyond 85 in lactating buffaloes.…”

Section: Resultssupporting

confidence: 52%

Heat stress responses to increasing temperature humidity index (THI) in lactating Murrah buffalo

Yadav¹,

Yadav²,

Madan³

et al. 2022

Buffalo Bull.

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The present study was conducted to determine the effect of increasing temperature humidity index (THI) on lactating Murrah buffalo. The study was conducted on six lactating buffaloes which were offered the same basal diet and were blocked by days in milk, milk yield and parity. The study was conducted during May, June and July with average THI of 79.88, 80.57 and 85.36, respectively. Milk yield was recorded twice a day at 06:00 and 18:00 h and physiological parameters were recorded and blood was sampled on 30th day of each month at 14:30 h. The results showed a significant decrease (P<0.05) in milk yield in buffaloes only at a THI of 85.36 as compared to THI up to 80.57. The rectal temperature (RT) did not change (P=0.580) with increasing THI up to 85.36, however, the respiration rate (RR) and pulse rate (PR) changed (P<0.05) progressively with increasing THI. Leucocytopnoea, lymphocytopnoea and neutrophilia; and alteration in serum urea, alkaline phosphatase activity, reactive oxygen species and phosphorus concentration were observed only at a THI of 85.36 as compared to THI up to 80.57. Similarly, significant (P<0.05) alteration in serum T4, cortisol and prolactin levels were observed at a THI of 85.36 as compared to THI up to 80.57. It can be concluded that lactating buffaloes experienced mild heat stress up to a THI of 80.57 (May and June) and a moderate type of heat stress at a THI 85.36 (July).

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Section: Resultssupporting

confidence: 52%

Heat stress responses to increasing temperature humidity index (THI) in lactating Murrah buffalo

Yadav¹,

Yadav²,

Madan³

et al. 2022

Buffalo Bull.

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“…Furthermore, the animals may have been preconditioned to the high temperature during the 1st heat wave. Thus, even under more severe heat stress conditions during the 2nd heat wave, the thermoregulatory mechanisms responded better due to preconditioning, eliciting a more intense and prolonged response characterized by a greater capacity to limit the increases in body temperature (Yadav et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Influence of successive heat waves on the thermoregulatory responses of pregnant and non-pregnant ewes

Pantoja

Campos

Almeida

et al. 2023

Journal of Thermal Biology

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“…Species that are less metabolically efficient have a larger metabolic heat load to deal with, which becomes difficult when the environment is not conducive to heat loss by dry or evaporative routes, such as hot and humid conditions exemplified by THI higher than 72 [ 67 ]. More metabolically efficient species/breeds have the potential to tolerate acute and chronic climate stress [ 68 , 69 , 70 ]. Heat shock proteins (HSPs) are studied in detail in relation to the enhanced thermotolerance [ 71 ].…”

Section: Discussionmentioning

confidence: 99%

Comparative Expression Profiling and Sequence Characterization of ATP1A1 Gene Associated with Heat Tolerance in Tropically Adapted Cattle

Elayadeth-Meethal

Veettil

Asaf

et al. 2021

Animals

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Climate change is an imminent threat to livestock production. One adaptation strategy is selection for heat tolerance. While it is established that the ATP1A1 gene and its product play an important role in the response to many stressors, there has been no attempt to characterize the sequence or to perform expression profiling of the gene in production animals. We undertook a field experiment to compare the expression profiles of ATP1A1 in heat-tolerant Vechur and Kasaragod cattle (Bos taurus indicus) with the profile of a heat-susceptible crossbreed (B. t. taurus × B. t. indicus). The cattle were exposed to heat stress while on pasture in the hot summer season. The environmental stress was quantified using the temperature humidity index (THI), while the heat tolerance of each breed was assessed using a heat tolerance coefficient (HTC). The ATP1A1 mRNA of Vechur cattle was amplified from cDNA and sequenced. The HTC varied significantly between the breeds and with time-of-day (p < 0.01). The breed–time-of-day interaction was also significant (p < 0.01). The relative expression of ATP1A1 differed between heat-tolerant and heat-susceptible breeds (p = 0.02). The expression of ATP1A1 at 08:00, 10:00 and 12:00, and the breed–time-of-day interaction, were not significant. The nucleotide sequence of Vechur ATP1A1 showed 99% homology with the B. t. taurus sequence. The protein sequence showed 98% homology with B. t. taurus cattle and with B. grunniens (yak) and 97.7% homology with Ovis aries (sheep). A molecular clock analysis revealed evidence of divergent adaptive evolution of the ATP1A1 gene favoring climate resilience in Vechur cattle. These findings further our knowledge of the relationship between the ATP1A1 gene and heat tolerance in phenotypically incongruent animals. We propose that ATP1A1 could be used in marker assisted selection (MAS) for heat tolerance.

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Acclimatization dynamics to extreme heat stress in crossbred cattle

Cited by 16 publications

References 42 publications

Heat stress responses to increasing temperature humidity index (THI) in lactating Murrah buffalo

Heat stress responses to increasing temperature humidity index (THI) in lactating Murrah buffalo

Influence of successive heat waves on the thermoregulatory responses of pregnant and non-pregnant ewes

Comparative Expression Profiling and Sequence Characterization of ATP1A1 Gene Associated with Heat Tolerance in Tropically Adapted Cattle

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