Effect of heat stress on production parameters and immune responses of commercial laying hens.
By M. Mashaly, G. Hendricks, M. Kalama, A. Gehad, A. O. Abbas, P. Patterson. Poultry Science, 2004
827 citations recorded by the source corpus.
The present study was conducted to determine the adverse effects of high temperature and humidity not only on live performance and egg quality but also on immune function in commercial laying hens. One hundred eighty 31-wk-old laying hens at peak production were used in this study. Hens were housed in cages (15 cages of 4 birds/cage) in each of 3 environmental chambers and received 1 of 3 treatments. The 3 treatments were control (average temperature and relative humidity), cyclic (daily cyclic temperature and humidity), and heat stress (constant heat and humidity) for 5 wk. Different production and immune parameters were measured. Body weight and feed consumption were significantly reduced in hens in the heat stress group. Egg production, egg weight, shell weight, shell thickness, and specific gravity were significantly inhibited among hens in the heat stress group. Likewise, total white blood cell (WBC) counts and antibody production were significantly inhibited in hens in the heat stress group. In addition, mortality was higher in the heat stress group compared to the cyclic and control groups. Even though T- and B-lymphocyte activities were not significantly affected by any of the treatments, lymphocytes from hens in the heat stress group had the least activity at 1 wk following treatment. These results indicate that heat stress not only adversely affects production performance but also inhibits immune function.
Subfields: Animal Science and Zoology
View Paper: https://www.semanticscholar.org/paper/de02836e589c6c1204b4bd935f981a423f30f239
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In Animal Science and Zoology
Citations in the corpus
- Impact of Heat Stress on Poultry Production (2013, background): “In laying hens, heat stress has been shown to negatively affect egg production and quality [43,61].”
- Effects of temperature and nest heat exposure on nestling growth, dehydration and survival in a Mediterranean hole‐nesting passerine (2014, background): “High temperature also affects the immune function of the bird, reducing total white blood cell counts and antibody production (Mashaly et al. 2004).”
- Effect of rearing system and season on the performance and egg characteristics of Ancona laying hens (2009, result): “In accord with this finding, Mashaly et al. (2004) reported a higher mortality in heat-stressed hens.”
- Effect of vitamin E in heat-stressed poultry (2011, methodology): “Mashaly et al. (2004) concluded that egg production is inversely related to high temperature.”
- Productive, physiological and immunological responses of two broiler strains fed different dietary regimens and exposed to heat stress (2017, background): “The reason for this regimen is that continuous heat stress does not normally occur in natural environments, as HS usually occurs in waves from 3 to 5 d, followed by a broken wave, and occurs for other waves depending on the environmental situation (Mashaly et al. 2004; Attia and Hassan 2017).”
- Effects of dietary herbal essential oil mixture and organic acid preparation on laying traits, gastrointestinal tract characteristics, blood parameters and immune response of laying hens in a hot summer season. (2011, background): “, 2004), egg weight (Balnave and Muheereza, 1997), eggshell thickness and strength (Mashaly et al., 2004).”
- Adaptation to hot climate and strategies to alleviate heat stress in livestock production. (2012, background): “The humoral immunity of broilers or laying hens is generally depressed in hot conditions, including decreases in total white blood cell count and antibody production (Mashaly et al., 2004).”