Effects of Early Heat Conditioning on Performance in Broilers exposed to Heat Stress

Yoon, Hae-Sung; Hwangbo, Jong; Yang, Young-Rok; Kim, Jimin; Kim, Yeon-Hwa; Park, Byungsung; Choi, Yang-Ho

doi:10.5536/kjps.2014.41.4.297

Cited by 7 publications

(6 citation statements)

References 20 publications

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“…In summary, this study involved chickens from two developmental stages; 4 and 6-week-old broiler chickens (4W and 6W, respectively), each comprised a treatment group exposed to the environments conditioned at 32 °C (4WH and 6WH, n = 3 each) and a control group at 21 °C (4WC and 6WC, n = 3 each). The temperatures under thermoneutral and hyperthermic conditions were derived from previous studies (Lin et al 2006 ; Yoon et al 2014 ).…”

Section: Methodsmentioning

confidence: 99%

Characterization of differential gene expression of broiler chicken to thermal stress in discrete developmental stages

Kim

et al. 2022

Animal Cells and Systems

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Prolonged exposure to high temperatures is linked to a range of physiological responses in broiler chickens including reduced disease resistance, low growth rate, and high mortality rate. In this study, we investigated the effect of heat stress on gene expression levels in 4-week-old and 6-week-old chickens each exposed to environments conditioned at thermoneutral (21 °C) and high (32 °C) temperatures. The analysis of differentially expressed genes (DEGs) using microarray revealed that genes underlying reactive oxygen species (ROS) production, cell nutrient intake, glucose metabolism, and circadian rhythm were differentially regulated in association with heat stress. We also found that the deviation in expression levels across the transcriptome in response to heat stress was significantly stronger ( P < 2.2×10 −16 ) in 6-week-olds compared to younger chickens. We finally observed a significant trend ( r = 0.78, P < 2.2×10 −16 ) that genes with a higher estimate of expression in the microarray were more likely to have a higher expression level in RNA-sequencing. Together, our findings provide comprehensive insights into the physiology involved in stress responses at varying developmental stages, which may facilitate chicken breeding to maximize their productivity under adverse conditions.

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Section: Methodsmentioning

confidence: 99%

Characterization of differential gene expression of broiler chicken to thermal stress in discrete developmental stages

Kim

et al. 2022

Animal Cells and Systems

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“…고온환경을 경험하는 육계 에서는 사료 섭취량, 음수량, 체중이 감소되며, 따라서 사료 효율이 감소되고, 체온, 지방 침착 및 폐사율은 증가하게 된 다 (Geraert et al, 1996;Quinteiro-Filho et al, 2010;Yahav et al, 1995;Yahav and Hurwitz, 1996;Yoon et al, 2014). 뿐만 아니라 스트레스 지표로 사용되는 혈중 corticosterone의 농도 와 heterophil : lymphocyte 비가 고온환경에서 증가하게 되 며 (Aksit et al, 2006;Altan et al, 2003;Yalcin et al, 2003;Yoon et al, 2014), PSE육이 발생하여 계육 품질 저하의 주요 요인이 된다 (Northcutt et al, 1994).…”

Section: 였다(Ministry Of Publicunclassified

“…뿐만 아니라 May(1995)는 사전고온 적응 처리된 육 계가 5주 또는 6주 후에 고온환경을 다시 경험했을 때 증체 량, 사료효율 및 폐사율에 차이를 보이지 않았으며, 이 결과 는 사전고온 적응의 유효성에 의문을 제기한다. 이러한 결 과와 일치하게 본 연구의 연저자 (Yoon et al, 2014)와 다른 연구자들 (May, 1995;Star et al, 2009) At 5 days of age, a group broiler chicks in one room were exposed to 37℃ for 24 hours while those in the other were maintained under the routine management serving as control. The birds in each room were divided into two identical subgroups on 21 days.…”

Section: 였다(Ministry Of Publicunclassified

“…고 찰 (Borges et al, 2004), 체중이 무 거운 육계일수록 고온에 더욱 민감하다 (Reece et al, 1972 (Arjona et al, 1988;Yahav and Hurwitz, 1996;Yahav et al, 1997) (Yoon et al, 2014), 이러 한 결과는 다른 연구자들에 의해서도 보고되었다 (Giloh et al, 2012). 고온환경은 스트레스호르몬인 corticosterone의 농도를 증가시킬 뿐만 아니라, 육계의 혈액성분에 영향을 미친다.…”

Section: 였다(Ministry Of Publicunclassified

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Effects of Repeated High Ambient Temperature on Performance in Broilers Heat-Conditioned at an Early Age

Hwangbo¹,

Yang²,

Yoon³

et al. 2015

Korean Journal of Poultry Science

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Heat conditioning at an early age has been known to help chickens cope with heat stress later in life. The present study was conducted to determine the effects of heat conditioning at 5 days of age in broilers repeatedly exposed to high ambient temperature later in life. A total of 256 day-old Arbor Acre boiler chicks were housed in two identical rooms with a 23-h light/1-h dark cycle and provided with feed and water ad libitum. At 5 days of age, the birds in one room were exposed to 37 °C for 24 hours, while those in the other room served as controls. On day 21, half of the birds in each room were moved into the other room so that each room contained both control and heat-conditioned birds. After a 7-day adaptation period, the birds in one room were exposed to high ambient temperature (21°C → 31°C) for 3 days, whereas those in the other room were kept at normal temperature. The same 3-day exposure to high ambient temperature was repeated two weeks later. Hence, there were four treatment groups (CON+CON: control+control; CON+HS: control+high ambient temperature; HC+CON: heat conditioning+control; and HC+HS: heat conditioning+high ambient temperature). Repeated heat stress resulted in decreased feed intake, water intake, body weight gain, and spleen weight (p<0.05) and increased rectal temperature (p<0.05), mortality, and plasma corticosterone concentrations. The relative weight of the spleen was increased in the heat-conditioned group (p<0.05). Plasma biochemicals were also influenced by high temperature. Thus, no beneficial effects of heat conditioning at an early age were detected in broilers repeatedly exposed to high ambient temperature later in life.

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“…The effects of heat stress in poultry include reduced feed intake, body weight gain, and production performance along with increased mortality (1)(2)(3)(4), which results in a loss of profits in poultry farms. These negative effects are accompanied by deterioration in meat quality (5), animal welfare (2,(6)(7)(8), and immune functions (3).…”

Section: Introductionmentioning

confidence: 99%

An Acute, Rather Than Progressive, Increase in Temperature-Humidity Index Has Severe Effects on Mortality in Laying Hens

et al. 2020

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This study was conducted to evaluate the effects of temperature-humidity index (THI) on the mortality and the panting rates in hens exposed to varying thermal environments. Hens were challenged with an acute elevation in THI in Experiment 1, where dry-bulb temperature and relative humidity were set at ∼27 • C and 56% at the beginning of the experiment and changed to 36 • C and 45% at its conclusion, respectively. In Experiment 2, different groups of hens were exposed to a progressive increase in THI, with similar ranges to those used in the previous experiment. In Experiment 3, the hens used in Experiment 2 were again challenged by THI conditions, the intensity of which ranged between those used in the previous two experiments. In Experiment 4, panting rates were recorded under varying THI. In the last, plasma biochemical profiles were determined in blood taken from hens subjected to experimental conditions similar to those in Experiment 2. When THI was acutely elevated from 24.2 • to 32.1 • C within 1 h and then maintained over 4.5 h, no mortality was detected in the first hour, but exceeded 95% after 5 h, and reached 100% at 5.5 h. A gradual increase in THI to 31.2 • C over 6 h did not result in mortality during the first 3 h. When THI was set below the conditions in Experiment 1 but above those in Experiment 2, mortality was 29% at 4 h, 75% at 5 h, and 79% at 8 h. However, no mortality was detected in their respective control groups. Panting was not observed under 25.3 • C and was largely variable under 30 • C. However, all hens exhibited panting exceeding 250 counts/min and 60% mortality at 34 • C when heat stress continued for a duration of up to 280 min. In Experiment 5, high ambient THI resulted in significant reductions in plasma albumin, amylase and aspartate aminotransferase, compared with those in control group (P < 0.05). These results suggest that an acute elevation of THI has more severe effects on mortality in hens than gradual changes even when temperature and humidity are similar in both cases.

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Effects of Early Heat Conditioning on Performance in Broilers exposed to Heat Stress

Cited by 7 publications

References 20 publications

Characterization of differential gene expression of broiler chicken to thermal stress in discrete developmental stages

Characterization of differential gene expression of broiler chicken to thermal stress in discrete developmental stages

Effects of Repeated High Ambient Temperature on Performance in Broilers Heat-Conditioned at an Early Age

An Acute, Rather Than Progressive, Increase in Temperature-Humidity Index Has Severe Effects on Mortality in Laying Hens

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