envolvimento da proteína, carboidrato, lipídio e selênio - Unesp

THE ENVIROMENT OF THE MACRONUTRIENTS AND THE SELENIUM OVER BOTH
THE METABOLICAL AND BIOCHEMICAL ALTERATIONS IN BROILER CHICKEN
SUBMITTED TO A STRESSING HEAT
SUMMARY – The experiment had as its main objetive to study both the metabolic and
biochemical alterations, mainly those related to the muscular, and antioxiodants
capcacities, when the broliers are submitted to different changes in their macronutrients,
and the addition of selenium into the diet while being submitted to an acute thermical
stress. It was used the 4 X 2 factorial design (4 diets X 2 levels of selenium) distributed
randomly. At 28, 35 and 42 days of life, the birds were submitted to a thermical stress of
35°C for 6 hours. It was evaluated the parameters of glucose, triglyceride, uric acid and
creatine kinase (CK). At 42 days after the thermical stress, it was dosed in the muscular
tissue of the trunk, the glutathione peroxidase (GSH-Px), superoxide dismutase (SOD),
catalase and thiobarbituric acid reacting substances (TBARS). The alterations in the
macronutrients caused metabolic and biochemical changes in the broilers, the proteic
level of the feed caused great impact over the levels of the trygliceride and uric acid in
the birds. Broilers submitted to a heating stress presented alterations in the
concentrations of the plasmatic metabolites and also, in the catalase in birds dieted with
different alterations in their feed. The addition of seleniun in the concentration of 0,3 ppm
did not alter the blood parameters from the 14 to 42 days of life, however, there was
some influence in the uric acid at 28 days, triglyceride, uric acid, and CK at 35 days, and
glucose at 42 days, when the birds were submitted to a heating stress. This addition did
not affect the catalase, SOD and GSH-Px, but a significative effect was detected over
the TBARS.
Key-words: broiler chickens, biochemical parameters, humor indicators,
macronutrients, selenium, thermical stress
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