Identification of HSPA1A SNPs and heat stress biomarkers using infrared thermography and gene expression analysis in Bos indicus
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Keywords:
Deoni cattle, HSPA1A gene, Infrared thermal imaging, Rectal temperatureAbstract
A study was conducted to evaluate seasonal thermal adaptability in 1,044 Deoni cattle representing Wanera (n = 356), Balankya (n = 560), and Shewara (n = 128) strains under semi-arid conditions of western India using infrared thermography, physiological measurements, and HSPA1A gene expression analysis. Body surface temperature was recorded from multiple anatomical regions during summer and winter, and the relationship with physiological variables and molecular markers was evaluated using a linear mixed-effects model with animal as a random effect. Surface temperature differed significantly at anatomical regions (P < 0.001) and varied with season and physiological status. Among the evaluated regions, the hump maintained a relatively stable mean surface temperature (approximately 34°C) across seasons and showed significant positive correlations with thorax, flank, and hip temperatures (r = 0.71–0.89, P < 0.001). The temperature–humidity index (THI) was moderately associated with hump temperature at morning but only weakly associated with the evening observations. No significant differences were observed in rectal temperature or respiration rate between the AA and BB genotypes (P > 0.05). Relative HSPA1A expression, quantified using the 2−ΔΔCt method after normalization to GAPDH, was found to be inversely associated with body surface temperature during morning observations (r = −0.71, P < 0.001) but showed no significant association during evening measurements (P > 0.05). These findings suggested that infrared thermography, when combined with physiological measurements and HSPA1A expression analysis, can provide complementary information for assessing thermal status in Deoni cattle.
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