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Haematological stress indicator of layer chickens in open sided and closed house systems

Layer hens in Malaysia are raised in different types of housing, such as open sided house and closed house system. Previous studies have shown layer hens raised in different housing systems experienced different levels of stress. Thus, this study was conducted to evaluate the heterophil to lymphocyt...

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Main Author: Kadir, Julailiyani
Format: Project Paper Report
Language:English
Published: 2015
Online Access:http://psasir.upm.edu.my/id/eprint/83587/1/FPV%202015%2039%20-%20IR.pdf
http://psasir.upm.edu.my/id/eprint/83587/
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spelling my.upm.eprints.835872020-10-01T02:11:48Z http://psasir.upm.edu.my/id/eprint/83587/ Haematological stress indicator of layer chickens in open sided and closed house systems Kadir, Julailiyani Layer hens in Malaysia are raised in different types of housing, such as open sided house and closed house system. Previous studies have shown layer hens raised in different housing systems experienced different levels of stress. Thus, this study was conducted to evaluate the heterophil to lymphocyte ratio (stress indicator) of layer hens raised in open sided and close house systems. A total of 120 Lohmann Brown birds were chosen randomly and equally (n=20) from two housing types comprised of three open sided houses and three closed houses. Blood samples were obtained once from the birds for the determination of the heterophil to lymphocyte (H/L) ratio. The environmental parameters include temperature, relative humidity and air velocity were taken in the morning, afternoon and evening on the same day of blood sampling. The heat stress index was calculated by the sum of the temperature and the relative humidity. During sampling, two of six houses, both were open sided houses, were not contracted with disease outbreaks (viral infection). Results showed that H/L ratio of unhealthy birds in the open sided houses was significantly (p<0.05) higher (1.113) compared to the healthy birds (0.646) reared in the similar house type. Meanwhile, the H/L ratio of unhealthy birds in the open sided house was significantly (p<0.05) higher (1.113) as compared to the unhealthy birds in the closed house system (0.836). Although the heat stress index for both types of houses was not exceeded the limit, which is 107 oC, the mean value of air velocity in the open sided houses was significantly (p<0.05) lower (0.4 m/s) compared to closed houses (1.8 m/s). Hence, it is suggested that low air velocity in the open sided houses contributed to the ineffective heat regulation by the birds via convection, which lead to stress and caused H/L elevated. Results in this study showed that H/L ratio is a good haematological stress indicator in layer hens, and unhealthy birds particularly the one that reared in an open sided house had higher H/L ratio indicating a greater stress response. 2015-03 Project Paper Report NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/83587/1/FPV%202015%2039%20-%20IR.pdf Kadir, Julailiyani (2015) Haematological stress indicator of layer chickens in open sided and closed house systems. [Project Paper Report]
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
description Layer hens in Malaysia are raised in different types of housing, such as open sided house and closed house system. Previous studies have shown layer hens raised in different housing systems experienced different levels of stress. Thus, this study was conducted to evaluate the heterophil to lymphocyte ratio (stress indicator) of layer hens raised in open sided and close house systems. A total of 120 Lohmann Brown birds were chosen randomly and equally (n=20) from two housing types comprised of three open sided houses and three closed houses. Blood samples were obtained once from the birds for the determination of the heterophil to lymphocyte (H/L) ratio. The environmental parameters include temperature, relative humidity and air velocity were taken in the morning, afternoon and evening on the same day of blood sampling. The heat stress index was calculated by the sum of the temperature and the relative humidity. During sampling, two of six houses, both were open sided houses, were not contracted with disease outbreaks (viral infection). Results showed that H/L ratio of unhealthy birds in the open sided houses was significantly (p<0.05) higher (1.113) compared to the healthy birds (0.646) reared in the similar house type. Meanwhile, the H/L ratio of unhealthy birds in the open sided house was significantly (p<0.05) higher (1.113) as compared to the unhealthy birds in the closed house system (0.836). Although the heat stress index for both types of houses was not exceeded the limit, which is 107 oC, the mean value of air velocity in the open sided houses was significantly (p<0.05) lower (0.4 m/s) compared to closed houses (1.8 m/s). Hence, it is suggested that low air velocity in the open sided houses contributed to the ineffective heat regulation by the birds via convection, which lead to stress and caused H/L elevated. Results in this study showed that H/L ratio is a good haematological stress indicator in layer hens, and unhealthy birds particularly the one that reared in an open sided house had higher H/L ratio indicating a greater stress response.
format Project Paper Report
author Kadir, Julailiyani
spellingShingle Kadir, Julailiyani
Haematological stress indicator of layer chickens in open sided and closed house systems
author_facet Kadir, Julailiyani
author_sort Kadir, Julailiyani
title Haematological stress indicator of layer chickens in open sided and closed house systems
title_short Haematological stress indicator of layer chickens in open sided and closed house systems
title_full Haematological stress indicator of layer chickens in open sided and closed house systems
title_fullStr Haematological stress indicator of layer chickens in open sided and closed house systems
title_full_unstemmed Haematological stress indicator of layer chickens in open sided and closed house systems
title_sort haematological stress indicator of layer chickens in open sided and closed house systems
publishDate 2015
url http://psasir.upm.edu.my/id/eprint/83587/1/FPV%202015%2039%20-%20IR.pdf
http://psasir.upm.edu.my/id/eprint/83587/
_version_ 1680322390104473600
score 13.211869

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