Thermal Efficiency Evaluation of High Density Poultry Housing in Different Environmental Control Systems.

Moura,; Jorge, Daniella; Nääs,; Alencar, Irenilza de; Welker,; Schenatto, Janaina; Catelan,; Fernanda,

doi:10.13031/2013.3539

Cited by 2 publications

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“…Hens perform better at constant temperatures (21-22°C) than varying temperatures (17-35°C) and health problems are less in constant temperatures [18] . Each 1°C increase in temperatures between 25-30°C results in 1.5% decrease in egg yield [19] .…”

Section: Introductionmentioning

confidence: 96%

“…In case of exceeding lower and upper heats, different effects and following physical changes can be observed on chickens: i) decrease in egg weight with heat stress [6] ; ii)heat stress increases with increasing temperature and relative humidity, egg yield and feed consumption decrease [7,8] ; iii) decrease Egg Yield Rate and increase Mortality Rate with increasing inside temperature and/or with increasing Temperature Humidity Index [9][10][11][12][13][14] ; iv) distinctive negative effects of heat stress on yield and mortality rates [15] ; v) strains in metabolism, ultimate changes in sensible heat and latent moisture production [16] ; vi) a 44% decrease in egg yield at 21°C poultry house [17] ; and vii) decrease trend in egg production [18] .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Heat Stress on Egg Yield and Mortality Rates of Caged Poultry Houses

Bayhan¹,

Karaman²,

Koşkan³

2013

Kafkas Univ Vet Fak Derg

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SummaryIn present study, effects of heat stress due to variations in indoor temperature and relative humidity on egg yield and mortality rates of hens in caged poultry houses were investigated between the months April and August (5 months). The experimental poultry house has automated feeder and waterer and operates at 90% capacity. Each cage has 5 hens and there were a total of 9900 Isa Brown hens in the poultry house before the experiments. Hens were 27 th weeks old in the beginnings of the experiment. During the experiments, indoor and outdoor climate parameters such as temperature and relative humidity, daily egg production and mortalities were continuously recorded. Structural characteristics of the poultry house were also determined. Heat and moisture gains/losses, temperature humidity index (THI), egg production rates (EPR) and mortality rates (MR) were calculated. Results revealed significantly increasing and strong relationships between indoor temperature and THI -MR and significantly decreasing relationships between indoor temperature and EPR (P<0.01). Indoor temperature increased from 20.7°C in April to 29.4°C in August, THI values increased from 66.1 to 77.0 during the same period. Therefore, mortality rates increased from 0.36% in April to 1.59% in August. While EPR was 88.7% in April, the value decreased to 79.4% in August. Without sufficient wall and roof insulation, it was found to be impossible to provide an indoor temperature of neither 18°C to keep EPR at high levels nor 21°C to keep MR≤‰0.1. Keywords: Poultry house, Temperature, Humidity, Heat stress, Egg production rate, Mortality rate Kafesli Kümeste Sıcaklık Stresinin Yumurta Verimi ve Mortalite Üzerine Etkileri ÖzetBu araştırmada Nisan-Ağustos döneminde (5 ay) kafesli tip yumurta tavuğu kümesinde kümes içi sıcaklık ve bağıl nem değişimine bağlı olarak ısı stresinin tavuklarda yumurta verimi ve mortalite üzerine etkisi incelenmiştir. Otomatik yemleme ve sulama sistemiyle donatılan, %90 kapasite kullanım oranına sahip olan kümeste her kafese 5 tavuk yerleştirilmiş olup, deneme başlangıcında kümeste 27 haftalık yaşta 9900 adet Isa Brown ırkı tavuk bulunmaktadır. Araştırma boyunca kümes içi ve dış ortam sıcaklık ve bağıl nemi, kümeste günlük yumurta üretimi, günlük ölen tavuk sayısı sürekli kaydedilmiştir. Ayrıca, kümese ait yapısal özellikler ölçülmüştür. Kümese ait ısı ve nem dengeleri, Sıcaklık Nem İndeksi (THI), Yumurta Verimi (EPR) ve Ölüm Oranı (MR) hesaplanmıştır. Araştırma sonuçlarına göre; kümes iç sıcaklığı ile THI ve MR arasında artan, kümes iç sıcaklığı ile EPR arasında ise azalan istatistik yönden çok önemli (P<0.01) ve kuvvetli ilişkiler tespit edilmiştir. Bu ilişkilere göre Nisan ayından Ağustos ayına doğru kümes sıcaklığının 20.7°C'den 29.4°C'ye ve THI'nin 66.1'den 77.0'a artışı sonucu aylık MR Nisanda %0.36 iken aylara göre artarak Ağustosta %1.59'a kadar çıkmıştır. EPR ise aynı dönemde aylık olarak Nisan'da %88.7 iken Ağustos ayında %79.4'e kadar gerilemiştir. Bu nedenle çatı ve duvarda yeterli izolasyon olmadan ve serinletm...

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%