Assessing the Thermo-Tolerance Potentials of Five Commercial Layer Chicken Genotypes Under Long-Term Heat Stress Environment as Measured by Their Performance Traits

Melesse, Aberra; Maak, Stefan; Pingel, H.; vonLengerken, Gehard

doi:10.5455/japa.20120929125835

Cited by 12 publications

(7 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Significant differences in BWFE and AFE were detected among genotypes, and the AB genotype had a significantly earlier onset of laying, followed by the AA and BB genotypes. Melesse et al (2013) found that in chickens under long-term heat stress conditions, body weight was significantly reduced and the AFE was earlier than average. Lien and Siopes (1993) noted maximum T 3 levels in turkeys during the early onset of laying.…”

Section: Discussionmentioning

confidence: 98%

“…Lien and Siopes (1993) noted maximum T 3 levels in turkeys during the early onset of laying. Melesse et al (2013) also referred to the phenomenon of higher plasma T 3 concentrations coupled with an earlier age at first egg, which might be related to the adaptation of birds to changes in metabolic demands caused by physiological stress and increased metabolic activity related to an earlier onset of egg production. The AB genotype had a significantly earlier onset of laying, which might be attributed to higher plasma T 3 levels that increased metabolic activity under normal physical conditions.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Association of heat shock protein 70 gene polymorphisms with acute thermal tolerance, growth, and egg production traits of native chickens in Taiwan

et al. 2016

View full text Add to dashboard Cite

Abstract. Heat stress is among the most challenging environmental conditions affecting commercial poultry. It severely affects growth and egg production, particularly in tropical and subtropical regions. This study aimed to examine physiological responses -including triiodothyronine (T 3 ) levels, enzymatic activity of creatine kinase (CK) and lactate dehydrogenase (LDH), respiratory rates, and cloacal temperature -to acute heat stress associated with different genotypes of the HSP70 gene and to evaluate the association of these polymorphisms with growth and egg production. Genotyping was performed by single-strand conformation polymorphism analysis. The polymorphisms identified were A258A, A258G, and G258G. Twenty 12-week old birds were randomly selected from each genotype and exposed to 40 • C ambient temperature for 1 h. Blood samples were collected at 0 and 1 h following heat stress. Respiratory rate and cloacal temperature were measured following 0, 30, and 60 min of exposure. After 1 h, the A258A genotype exhibited lower levels of CK activity and plasma T 3 . Neither respiratory rate nor cloacal temperature displayed a significant association with the genotypes. Body weight gain differed among the genotypes for males (F = 3.268, P = 0.041) and females (F = 14.029, P < 0.001), and the A258A genotype exhibited the greatest weight gain at 0-16 weeks of age for both genders. There were no significant differences among genotypes regarding egg weight at first egg or the number of eggs laid until 40 weeks of age. The A258A genotype displayed higher heat tolerance with no negative effects on growth performance and egg production.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Association of heat shock protein 70 gene polymorphisms with acute thermal tolerance, growth, and egg production traits of native chickens in Taiwan

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Mahmoud et al, 1996;Mashaly et al, 2004;Melesse et al, 2013). To avoid these situations, more or less sophisticated automatic environmental control systems usually regulate the range of ambient temperature.…”

Section: Perch Temperaturementioning

confidence: 99%

Scientific Opinion on welfare aspects of the use of perches for laying hens

2015

EFS2

View full text Add to dashboard Cite

This opinion investigated the use of perches for laying hens in cage and non-cage systems. It is based on various activities reviewing the effects of perch height and design on hen health and welfare. Systematic and extensive literature reviews were conducted to assess the scientific evidence about hen motivation to grasp and seek elevation, and the appropriate height of perches as well as other features (position, material, colour, temperature, shape, width and length). In addition, an expert knowledge elicitation (EKE) exercise was run with technical hearing experts to discuss and prioritise the various design aspects of perches. Overall, the body of literature on perches is limited. Relevant features of perches are often confounded with others. In the literature, the most commonly used animal-based measures to assess perch adequacy are keel bone damages, foot pad lesions and perch use by hens. Overall, hens seek elevation during the day as well as during the night, when they select a site for roosting. Elevated perches allow hens to monitor the environment, to escape from other hens, avoid disturbances and improve thermoregulation. For night-time roosting hens show a preference for perches higher than 60cm compared with lower perches. However, elevated perches can have negative consequences with increased prevalence of keel deformities and fractures. The risk of injury increases when hens have to jump a distance of more than 80cm vertically, horizontally or diagonally to reach or leave a perch, or jump an angle between 45 and 90° (measured at the horizontal plane). Material, shape, length and width of the perch also influence perch preference by hens. The EKE exercise suggests that an adequate perch is elevated, accessible and functional (providing sufficient overview). The opinion concludes that for the design of an adequate perch, different features of perches need to be further investigated and integrated.

show abstract

“…In a recent study [88], thermo-tolerance was evaluated in five commercial chicken genotypes (Lohmann Brown, Lohmann White, New Hampshire, dwarf White Leghorn, and White Leghorn) who were divided into two subgroups. Chickens of the first subgroup of each genotype were kept at a comfortable temperature for a long time (18-20 С), chickens of the second group were kept under the heat stress conditions (30-32 С).…”

Section: F E a T U R E S O F D R I N K I N G W A T E R P R E P A R A mentioning

confidence: 99%

HEAT STRESS IN POULTRY. II. METHODS AND TECHNIQUES FOR PREVENTION AND ALLEVIATION (review)

Фисинин¹,

Kavtarashvili²

2015

S-h. biol.

View full text Add to dashboard Cite

A b s t r a c tAn adverse effect of heat stress in poultry depends on both the external factors such as diet, water supply, rearing technology, birds' population density, air humidity and flow rate, etc., and the internal factors, particularly, poultry species and breed specificity, physiological conditions, etc. Herein, the approaches to prevention and alleviation of heat stress in poultry are summarized and discussed. Different strategies were proposed for lowering of body heat production and for better heat dissipation, thus maintaining productivity and product quality and minimizing losses for poultry farms. These strategies include the increase in energetic level of a diet in accordance with decrease in feed consumption due to stress (N.J. Daghir, 2009) and inclusion of higher (up to 4-5 %) levels of fat (B.L. Red, 1981; N. Usayran et al., 2001; A.A. Ghazalah et al., 2008); decrease by 2-4 % of dietary crude protein (Q.U. Zaman et al., 2008) and carbohydrate levels (metabolization of fat produces less heat than protein and carbohydrates) (N

show abstract

Assessing the Thermo-Tolerance Potentials of Five Commercial Layer Chicken Genotypes Under Long-Term Heat Stress Environment as Measured by Their Performance Traits

Cited by 12 publications

References 36 publications

Association of heat shock protein 70 gene polymorphisms with acute thermal tolerance, growth, and egg production traits of native chickens in Taiwan

Association of heat shock protein 70 gene polymorphisms with acute thermal tolerance, growth, and egg production traits of native chickens in Taiwan

Scientific Opinion on welfare aspects of the use of perches for laying hens

HEAT STRESS IN POULTRY. II. METHODS AND TECHNIQUES FOR PREVENTION AND ALLEVIATION (review)

Contact Info

Product

Resources

About