scholarly journals Effect of Heat Stress on Production Parameters and Immune Responses of Commercial Laying Hens

2004 ◽  
Vol 83 (6) ◽  
pp. 889-894 ◽  
Author(s):  
M.M. Mashaly ◽  
G.L. Hendricks ◽  
M.A. Kalama ◽  
A.E. Gehad ◽  
A.O. Abbas ◽  
...  
Keyword(s):  
Heat Stress ◽  
Immune Responses ◽  
Laying Hens ◽  
Production Parameters

scholarly journals Effects of dietary levels of vitamin A on the egg yield and immune responses of laying hens

1998 ◽  
Vol 77 (4) ◽  
pp. 542-546 ◽  
Author(s):  
B Coskun ◽  
F Inal ◽  
I Celik ◽  
O Erganis ◽  
AM Tiftik ◽  
...  
Keyword(s):  
Vitamin A ◽  
Immune Responses ◽  
Laying Hens

scholarly journals Dietary Germinated Paddy Rice and Stocking Density Affect Egg Performance, Serum Biochemical Properties, and Proteomic and Transcriptomic Response of Laying Hens Exposed to Chronic Heat Stress

Proteomes ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 48
Author(s):  
Tossaporn Incharoen ◽  
Sittiruk Roytrakul ◽  
Wirot Likittrakulwong
Keyword(s):  
Heat Stress ◽  
Egg Production ◽  
Laying Hens ◽  
Protein Profile ◽  
Stocking Density ◽  
Biochemical Properties ◽  
Paddy Rice ◽  
Egg Mass ◽  
Serum Samples ◽  
Transcriptomic Response

Germinated paddy rice (GPR) could be a good alternative feed source for poultry with stocking density and heat stress problems. A total of 72 Hy-line Brown laying hens raised under low (LSD, 0.12 m2/bird) and high stocking densities (HSD, 0.06 m2/bird) were investigated. Three dietary GPR levels (0, 74 and 148 g/kg) were used. It was found that average daily feed intake, hen-day egg production, and egg mass significantly decreased in the HSD group. The levels of serum glucose (GLU), phosphorous (P), corticosterone (CORT), total Ig, lysozyme (LZY), and superoxide dismutase activities (SOD) in the HSD group were higher than those in the LSD group. Dietary GPR significantly affected GLU, P, alternative complement haemolytic 50 (ACH50), total Ig, and LZY. Moreover, CORT level significantly decreased in 74 and 148 g/kg dietary GPR groups, whereas SOD significantly increased only in the 148 g/kg dietary GPR group. Serum samples were analyzed using liquid chromatography-tandem mass spectrometry, and 8607 proteins were identified. Proteome analysis revealed 19 proteins which were enriched in different stocking densities and dietary GPR levels. Quantitative real-time reverse transcription-PCR technique was successfully used to verify the differentiated abundant protein profile changes. The proteins identified in this study could serve as appropriate biomarkers.

Heat stress mediates changes in fecal microbiome and functional pathways of laying hens

2018 ◽  
Vol 103 (1) ◽  
pp. 461-472 ◽  
Author(s):  
Lihui Zhu ◽  
Rongrong Liao ◽  
Ning Wu ◽  
Gensheng Zhu ◽  
Changsuo Yang
Keyword(s):  
Heat Stress ◽  
Laying Hens ◽  
Fecal Microbiome ◽  
Functional Pathways

scholarly journals A simple way to reduce heat stress in laying hens as judged by egg laying, body weight gain and biochemical parameters

2001 ◽  
Vol 49 (4) ◽  
pp. 421-430 ◽  
Author(s):  
K. Şahin ◽  
O. Küçük
Keyword(s):  
Heat Stress ◽  
Feed Intake ◽  
Egg Production ◽  
Laying Hens ◽  
Body Weight Gain ◽  
Management Practice ◽  
Egg Laying ◽  
Control Group ◽  
Serum Glutamic Oxaloacetic Transaminase ◽  
Feed Withdrawal

This study was designed to test the effects of feed withdrawal and darkening on the performance, triiodothyronine (T3), thyroxine (T4), thyroid-stimulating hormone (TSH), adrenocorticotropic hormone (ACTH), and some blood serum metabolite and mineral concentrations of laying hens reared at high ambient temperatures ranging from 25 to 35 °C. Ninety, 16-week-old hens (Ross Brown) were divided into 3 groups, 30 hens each. The first group was used as control. Hens in the second group (feed withdrawal) were subjected to feed removal from 14:00 to 18:00, and hens in the third group (darkening) were subjected to light restriction from 14:00 to 18:00 using black curtains. Liveweight, feed intake, and egg production were higher (P < 0.01) in the feed withdrawal and darkening groups, particularly in the darkening group, than in the control. Water intake was higher in the control group compared with the feed withdrawal and darkening groups (P < 0.01). T3, T4, and TSH concentrations in the serum were higher (P < 0.01), whereas ACTH serum concentration was lower (P < 0.01) in the feed withdrawal and darkening groups compared with the control. The haematocrit was higher in the feed withdrawal and darkening groups compared with the control (P < 0.01). Darkening and feed withdrawal treatments increased serum glucose, urea-N, uric acid, albumin, triglyceride, cholesterol, Ca, P, Na, and K concentrations, also the activities of amylase and alkaline phosphatase, but did not influence the activities of serum glutamic-oxaloacetic transaminase (SGOT) and serum glutamic pyruvic transaminase (SGPT). The present study found that feed withdrawal and darkening, particularly darkening, at high temperatures during the summer months offer a good management practice to reduce heat stress related depression in feed intake and egg production in laying hens.

scholarly journals Genetic variations alter physiological responses following heat stress in 2 strains of laying hens

2012 ◽  
Vol 91 (7) ◽  
pp. 1542-1551 ◽  
Author(s):  
J.N. Felver-Gant ◽  
L.A. Mack ◽  
R.L. Dennis ◽  
S.D. Eicher ◽  
H.W. Cheng
Keyword(s):  
Heat Stress ◽  
Laying Hens ◽  
Physiological Responses ◽  
Genetic Variations
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