Determination of thermal comfort zone for early-stage broilers

Cândido, Márcia Gabrielle Lima; Tinôco, Ilda de Fátima Ferreira; Pinto, Francisco de Assis de Carvalho; Santos, Nerílson Terra; Roberti, Ricardo Pereira

doi:10.1590/1809-4430-eng.agric.v36n5p760-767/2016

Cited by 26 publications

(23 citation statements)

References 16 publications

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“…These results are in accordance with those found by Cândido et al (2016), who assessed the effects of five different thermal environments on the welfare of broiler chickens from one to 21 days and observed that the treatments moderate cold (24 °C in the first week, 21 °C in the second week, and 18 °C in the third week of life) and accentuated cold (21 °C in the first week, 18 °C in the second week, and 15 °C in the third week of life) provided a significantly higher feed intake than the other treatments.…”

Section: Feed Intakesupporting

confidence: 94%

Influence of Different Thermal Environments on the Performance of Laying Hens During the Initial Stage of Rearing

et al. 2019

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This study was conducted with the aim of assessing the effects of different ambient temperature values on the performance of laying birds from one to 42 days of age in order to obtain optimal comfort temperatures. A total of 864 laying hens were distributed in four climatic chambers with different temperature ranges. One of the chambers was maintained within the thermal range recommended by the literature and the others were maintained under temperatures that consisted of mild and moderate cold stress and moderate heat stress. The experiment was conducted according to a completely randomized design in a split-plot arrangement and six replications. The data were analyzed by means of the analysis of variance and regression. The final performance of birds with temperatures of 33, 28, 26, 23, 19, and 19 °C (for the first, second, third, fourth, fifth, and sixth week of age, respectively) presented better productive results, confirming the assertiveness regarding the best thermal comfort and welfare of laying birds during the rearing stage. The results showed that under conditions of cold thermal stress, birds presented a worse performance, thus affecting their development and productive efficiency.

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Section: Feed Intakesupporting

confidence: 94%

Influence of Different Thermal Environments on the Performance of Laying Hens During the Initial Stage of Rearing

et al. 2019

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“…The enthalpy comfort/discomfort limits (Table 2) for each phase of the broilers' lives were calculated through tdb and RH limits obtained by several authors (Medeiros et al, 2005;Cassuce et al, 2013;Cândido et al, 2016). According to the combinations of birds' life stages and enthalpy (H) ( Figure 5), 243 rules were defined, and for each rule, a weighting factor of 1 was assigned, as all rules have the same importance in determining the model responses, as adopted by several authors Ponciano et al, 2012;Schiassi et al, 2013;Schiassi et al, 2014).…”

Section: Development and Validation Of The Fuzzy Modelmentioning

confidence: 99%

Productive Responses From Broiler Chickens Raised in Different Commercial Production Systems - Part I: Fuzzy Modeling

et al. 2019

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Broiler chickens are classified as homoeothermic animals and require a production environment within well-defined thermal comfort intervals. Therefore, the development of algorithms (mathematical models) to control the environment that can be embedded in microcontrollers becomes necessary. Hence, this work aimed to develop a fuzzy model for predicting the productive performance of broiler chickens as a function of the thermal environment during the various breeding phases. The Mamdani inference and defuzzification methods were used, by means of the gravity center, to develop the fuzzy model. Two hundred and forty-three rules with weighting factors of 1.0 each were elaborated. Three commercial warehouses (conventional system, wind tunnel with negative pressure and dark house) were evaluated for testing of the model. We recorded the thermal environment (dry bulb temperature-tdb and relative humidity-RH) and productivity data (feed intake-FI, weight gain-WG, feed conversion-FC and productive efficiency index-PEI) over six lots in each aviary. The resulting fuzzy model was capable of forecasting FI, WG, FC, and PEI, with standard deviations and mean percentage errors of 4.16 g and 5.05%, 146.53 g and 8.04%, 0.06 g g-1 and 4.96%, and 24.51 g and 12.29%, respectively.

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“…The average temperature observed during this study is approximately 7.1°C higher than the upper critical temperature of 21–24°C (Cândido, Tinôco, Pinto, Santos, & Roberti, 2016) reported as thermoneutral zone for broiler chickens. Experience of environmental temperature above 24°C in the rearing pen is a major challenge in the poultry industry in the tropics (Tirawattanawanich, Chantakru, Nimitsantiwong, & Tongyai, 2011).…”

Section: Discussionmentioning

confidence: 49%

Comparative study of adaptation in three chicken genotypes under humid tropical conditions of Nigeria

Abioja

Omotara

Iyasere

et al. 2020

Animal Physiology Nutrition

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Adaptation of Nigerian indigenous chickens (NIC), FUNAAB‐α (F‐α) and Transylvanian naked neck chickens (TNN) raised during hot‐dry season under humid tropical environment was compared during a 4‐week period. A well‐adapted NIC (n = 12; 6 males and 6 females), a newly developed F‐α (n = 12; 6 male and 6 females) and a newly introduced TNN (n = 12; 6 male and 6 females) chickens aged 36 weeks were used for this experiment. Heart rate (HR), respiratory rate (RR), rectal temperature (RT) and skin temperature on comb (COM), wattle (WAT), breast (BRE) and under wings (WIN) were monitored between 13.00 and 14.00h twice a week for four weeks. Wattle temperature (p = .017) and BRE (p = .000) differ significantly among the genotypes. Transylvanian naked neck chickens recorded higher WAT than NIC, though not different from F‐α. Nigerian indigenous chickens had lower BRE temperature than other two genotypes. Significantly higher WAT (p < .001) and WIN (p < .05) were recorded in cocks than in laying hens. In contrast, laying hens had significantly (p < .001) higher RR and HSI than cocks. There was interactive (p < .05) effect of sex and genotype on BRE. Nigerian indigenous cocks and hens exhibited lower BRE than others, except F‐α cock. There were positive significant correlations between WIN and WAT in the three genotypes. In NIC, COM had positive correlation with WAT (r = .532) and WIN (r = .696). Heart rate was positively correlated with WAT (r = .608) and WIN (r = .697) in F‐α, and WIN (r = .512) in TNN chickens. In conclusion, the three genotypes can adequately adapt to the prevailing conditions of humid tropics. Reduction of feather on the neck and breast and higher heat loss capacity in TNN chickens could help the birds adapt to hot‐humid environment. The two sexes could adapt to the tropical region. Cocks lose body heat predominantly via non‐evaporative means while hens employ evaporative heat loss mechanism.

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Determination of thermal comfort zone for early-stage broilers

Cited by 26 publications

References 16 publications

Influence of Different Thermal Environments on the Performance of Laying Hens During the Initial Stage of Rearing

Influence of Different Thermal Environments on the Performance of Laying Hens During the Initial Stage of Rearing

Productive Responses From Broiler Chickens Raised in Different Commercial Production Systems - Part I: Fuzzy Modeling

Comparative study of adaptation in three chicken genotypes under humid tropical conditions of Nigeria

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