Effects of repeated thermal manipulation of broiler embryos on hatchability, chick quality, and post-hatch performance

Amjadian, Tahere; Shahir, Mohammad Hossein

doi:10.1007/s00484-020-02012-w

Cited by 11 publications

(11 citation statements)

References 34 publications

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“…TMH accelerated the hatchability rate compared with the control group, while the TML group had an insignificant delaying effect on the hatchability. The previous studies reported contradictory findings on the overall hatchability rate, which may be attributed to the use of broilers of different strains types, ages, or incubation temperatures and relative humidities [46][47][48][49]. Formerly, a low incubation temperature was found to extend the incubation period of broiler eggs and subsequently delayed hatching [50,51].…”

Section: Impact Of Tml and Tmh Temperatures On The Physiological Parameters Of Broilers Subjected To Thermal Stressmentioning

confidence: 96%

Molecular and morphometric changes in the small intestine during hot and cold exposure in thermally manipulated broiler chickens

2021

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Background and Aim: Thermal stress (hot or cold) is one of many environmental stressors that severely affects the health of broiler chickens. One negative effect of thermal stress is the disruption of the intestinal barrier function in broiler chickens. This study aimed to evaluate the effect of thermal manipulation (TM) on the small intestine in terms of histomorphometry as well as junctional, heat-shock, and immune response gene expression during post-hatch exposure to thermal stress. Materials and Methods: The experiment was conducted by dividing 928 fertile Ross eggs into three incubation groups: The control (C) group (incubated at 37.8°C and 56% relative humidity [RH] for the whole incubation period), the TM using low temperature TML group (incubated at 36°C and 56% RH for 18 h/day from embryonic days 7 to 16), and the TM using high temperature (TMH) group (incubated at 39°C and 65% RH for 18 h/day from embryonic days 7 to 16). On post-hatch day 21, 90 chicks were randomly selected from each incubation group and were equally subdivided into three subgroups for the post-hatch thermal stress experiment: The TN subgroup (room temperature maintained at 24°C), the heat stress (HS) subgroup (room temperature maintained at 35°C), and the cold stress (CS) subgroup (room temperature maintained at 16°C). After 1 day of thermal stress exposure (age 22 days), five birds from each subgroup were euthanized and ileum samples were collected to evaluate the transcription of the Claudin (CLDN1), CLDN-5, Occludin, Cadherin-1, heat shock factors (HSF1), HSF3, 70 kilodalton heat shock protein, 90 kilodalton heat shock protein, Interleukin 6 (IL6), IL8, toll-like receptors-2 (TLR2), and TLR4 genes by Real-Time Quantitative Reverse Transcription polymerase chain reaction analysis. Finally, after 4 and 7 days of thermal stress (age 25 and 28 days, respectively), nine chicks were euthanized, and their jejunum and ileum were collected for histomorphometric analysis. Results: After exposure to 1 day of thermal stress, the C subgroups exposed to thermal stress (HS and CS) possessed significantly increased expression of junctional, heat-shock, and immune response genes compared to the C-TN subgroup, and similar results were observed for the TMH. In contrast, thermally stressed TMH subgroups had significantly lower expression of the studied genes compared to C subgroups exposed to thermal stress. Furthermore, no significant changes were detected between the TML subgroups exposed to thermal stress and TML-TN. Moreover, significant alterations in villus height (VH), villus surface area, crypt depth (CD), and VH to CD ratio were observed between the TML, TMH, and C subgroups exposed to CS. Conclusion: It might be suggested that TM may have a protective impact on the small intestine histomorphometry and epithelial integrity of broilers during post-hatch exposure to thermal stress.

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Section: Impact Of Tml and Tmh Temperatures On The Physiological Parameters Of Broilers Subjected To Thermal Stressmentioning

confidence: 96%

Molecular and morphometric changes in the small intestine during hot and cold exposure in thermally manipulated broiler chickens

2021

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“…Embryo mortality was reported in four of 24 intermittent TM studies, of which three studies observed no significant difference in embryo mortality between intermittent TM and control groups [48,49,52]. However, Brannan et al [54] identified increased embryo mortality in intermittent TM groups compared with control group.…”

Section: General Characteristics Of the Studies Included In The Syste...mentioning

confidence: 99%

“…Hatch or chick body temperature was reported in eight of 24 intermittent TM studies, which included no significant effect [48,52], increased [30,42,51], and reduced [18,49,50].…”

Section: General Characteristics Of the Studies Included In The Syste...mentioning

confidence: 99%

“…However, some recent studies have reported that TM increased [30,51] and had no influence on hatch body temperature [48,52]. These differences may be associated with the possible elevation or similarity in hormones that regulate metabolism (T 3 ) and growth (GH) leading to elevated or similar metabolic rate and heat production, accompanied with elevated and similar body temperature in thermal manipulated chickens and both thermal manipulated and control treatments, respectively [36,39].…”

Section: Thermal Manipulation and Thermotolerance Acquistionmentioning

confidence: 99%

“…Studies by Morita et al [39] and Amjadian and Shahir [48] identified that exposure of embryos to high temperatures increased eggshell temperature in comparison to standard incubation temperature. The eggshell temperature reflects embryo body temperature [66].…”

Section: Thermal Manipulation and Eggshell Temperaturementioning

confidence: 99%

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Thermal Manipulation: Embryonic Development, Hatchability, and Hatching Quality of Broiler Chicks

Tainika¹

2022

Broiler Industry

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Here, PRISMA guidelines were utilized to systematically evaluate the publications reporting the effect of thermal manipulation during embryogenesis on incubation performance, hatchability, and hatching quality of broiler chicks. The search and selection of eligible publications was through databases web of science, PubMed, and Scopus. Publications written in English between 2015 and September 2021 were considered. It is evidenced that during TM, key considerations include duration and strength of TM besides stage of embryonic development. The moderate elevation in incubation temperature (38.5–39.5°C) intermittently (3–18 h/d) between E07 and E18 improves the chick’s thermoregulation capacity and reduces any adverse effect of TM on hatchability, and chick quality (e.g., hatch weight and chick length) compared with continuous TM. In addition, high temperature TM (38.5–39.5°C) between E7 and E18 has no significant effect on embryo mortality, hatchability, and chick quality compared to standard incubation temperature (37.8°C). TM above 39.5°C significantly increases and decreases embryo mortality and hatchability, respectively compared with standard incubation temperature. In conclusion, the results of TM studies on embryogenesis, hatchability and hatching quality of broiler chicks are still contradicting, which is a possible limitation for its commercial use.

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Hyperspectral image reconstruction for predicting chick embryo mortality towards advancing egg and hatchery industry

Ahmed,

Monjur

et al. 2024

Smart Agricultural Technology

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Effects of repeated thermal manipulation of broiler embryos on hatchability, chick quality, and post-hatch performance

Cited by 11 publications

References 34 publications

Molecular and morphometric changes in the small intestine during hot and cold exposure in thermally manipulated broiler chickens

Molecular and morphometric changes in the small intestine during hot and cold exposure in thermally manipulated broiler chickens

Thermal Manipulation: Embryonic Development, Hatchability, and Hatching Quality of Broiler Chicks

Hyperspectral image reconstruction for predicting chick embryo mortality towards advancing egg and hatchery industry

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