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Effects of environmental temperature and light intensity on blood physiological parameters of broilers
Author(s) -
OLANREWAJU HAMMED AKANDE,
BRANTON SCOTT L,
PURSWELL JOSEPH L,
COLLIER STEPHANIE D,
DOZIER WILLIAM A
Publication year - 2010
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.24.1_supplement.973.1
Subject(s) - hematocrit , chemistry , zoology , broiler , bicarbonate , hemoglobin , light intensity , acid–base homeostasis , intensity (physics) , venous blood , endocrinology , biochemistry , biology , organic chemistry , quantum mechanics , physics , optics
This study examined the effects of atmospheric temperature, light intensity, and their interaction on blood acid‐base balance and electrolytes in broiler chickens under environmentally controlled conditions in 2 trials. The experiment consisted of a factorial arranged in a randomized complete block design with 9 treatments consisted of 3 levels (Low=15.6, Moderate=21.1, High=26.7 °C) of temperatures and 3 levels (0.5, 3.0, 20 lx) of light intensities from d 21 to 56 d of age at 50% RH. Five hundred and forty (30 male/30 female) Ross × Ross 708 chicks were randomly distributed into 9 chambers at 1 d of age. Feed and water were provided ad libitum . Venous blood samples were collected on d 21 (base line), 28, 42, and 56. High temperature significantly (P ≤ 0.05) reduced BW, partial pressure of CO 2 (pCO 2 ), bicarbonate, hematocrit, hemoglobin, Ca 2+ , K + , and Na + while significantly (P ≤ 0.05) elevated pH level, glucose, osmolality, and anion gap concentrations. Partial pressure of O 2 (pO 2 ) was slightly increased when related to ambient temperature. There was no effect of light‐intensity on most of the examined variables. Acid‐base regulation during high ambient temperature and light intensity exposure had not deteriorated despite lower pCO 2 that consequently increased blood pH, due to a compensatory decrease in HCO 3 − concentration. Plasma corticosterone was not affected by temperature, light intensity or their interaction. These results indicate that continuous exposure of broiler chickens to high temperature, high light intensity or their interaction markedly affects some physiological blood variables without inducing stress in broilers.