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<p>This study aimed to elucidate the impact of embryonic thermal conditioning (ETC) in combination with early post-hatch heat conditioning (EPHHC) on acquired thermotolerance in slow growing CARI-Debendra birds (<i>n</i> = 224) till 12 weeks. Embryonic conditioning was done only from E11-16 at 39.5&#xa0;°C with RH 60–70% for 5&#xa0;h/ day while conventional incubational conditions followed in control. After hatching, the chicks were chosen in a random manner group-wise and further distributed in two sub groups each (no manipulation, early post-hatch heat conditioning). Early post-hatch heat conditioning was carried out for first five weeks for chicks with brooding temperature of 37 ± 1&#xa0;°C than control. Significant difference was observed in hatch weight and hatching time between ETC and control without any adverse effect on fertility and hatchability. ETC had significantly improved body weight (<i>P</i> &lt; 0.01) from 1st week till 12th weeks while heat conditioning group displayed a 1% increase in body weight (<i>P</i> &lt; 0.05) at six weeks. Interactive effect of sequential thermal conditioning too contributed positively in enhancing body weight (<i>P</i> &lt; 0.05) till 5th week. Stress biomarkers such as concentration of thyroxine (T4), potassium and activity of creatinine kinase enzyme were higher in ETC group than control while H/L ratio and concentration of triiodothyronine (T3) was lower in ETC group indicating mechanism for improved thermotolerance. Expression dynamics of HSP70 gene was significantly higher in liver, breast muscle and small intestine tissues of ETC group respectively, while GRP78 gene showed tissue-specific upregulation in the intestine and breast muscle of 12-week-old control chickens. Embryonic thermal manipulation and early post-hatch heat conditioning positively influenced thermotolerance ability and productivity of slow growing birds. Perinatal thermal conditioning is an efficient and economical way for heat alleviation without hampering productivity in birds exposed to hot climatic conditions.</p>

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Elucidating the sequential mechanism of thermal conditioning on acquired thermotolerance in slow growing poultry under coastal ecosystem

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Nibedita Nayak,
  • Subrat Kumar Bhanja,
  • Eaknath B. Chakurkar,
  • Amiya Ranjan Sahu,
  • J. S. Tyagi,
  • Bappa Das,
  • Krutika R. Shinde,
  • Abhijeet Champati

摘要

This study aimed to elucidate the impact of embryonic thermal conditioning (ETC) in combination with early post-hatch heat conditioning (EPHHC) on acquired thermotolerance in slow growing CARI-Debendra birds (n = 224) till 12 weeks. Embryonic conditioning was done only from E11-16 at 39.5 °C with RH 60–70% for 5 h/ day while conventional incubational conditions followed in control. After hatching, the chicks were chosen in a random manner group-wise and further distributed in two sub groups each (no manipulation, early post-hatch heat conditioning). Early post-hatch heat conditioning was carried out for first five weeks for chicks with brooding temperature of 37 ± 1 °C than control. Significant difference was observed in hatch weight and hatching time between ETC and control without any adverse effect on fertility and hatchability. ETC had significantly improved body weight (P < 0.01) from 1st week till 12th weeks while heat conditioning group displayed a 1% increase in body weight (P < 0.05) at six weeks. Interactive effect of sequential thermal conditioning too contributed positively in enhancing body weight (P < 0.05) till 5th week. Stress biomarkers such as concentration of thyroxine (T4), potassium and activity of creatinine kinase enzyme were higher in ETC group than control while H/L ratio and concentration of triiodothyronine (T3) was lower in ETC group indicating mechanism for improved thermotolerance. Expression dynamics of HSP70 gene was significantly higher in liver, breast muscle and small intestine tissues of ETC group respectively, while GRP78 gene showed tissue-specific upregulation in the intestine and breast muscle of 12-week-old control chickens. Embryonic thermal manipulation and early post-hatch heat conditioning positively influenced thermotolerance ability and productivity of slow growing birds. Perinatal thermal conditioning is an efficient and economical way for heat alleviation without hampering productivity in birds exposed to hot climatic conditions.