Résumé:
"The purpose of this study was to determine changes in plasma concentrations of 19
biochemical parameters of lipid, protein, carbohydrates, minerals metabolism and free
thyroxin in two strains of fast growing broiler chickens: Isa 15 strain and Arbor Acres strain
reared in the same conditions, and then compare the growth performance and blood profiles
of these two groups of animals. Broilers Arbor Acres strain showed a greater food
consumption and body weight at slaughter, with a higher mortality and consumption index
when compared to Isa 15 strain. Only concentrations of urea, ALAT, and total bilirubin
remained very low and did not show any significant changes. It should be noted that the
determination of albumin by spectrophotometry using Bromocresol purple has been
inadequate on avian blood samples. The plasma protein electrophoresis provides in this case a
more accurate concentration of albumin and other plasma proteins measured.
Significant differences (p <0.05) between the two strains were observed for plasma glucose,
uric acid, creatinine, calcium, phosphorus, magnesium, chloride, and ASAT.
Thyroid hormones influence major metabolic pathways, and are therefore involved in the
regulation of the metabolism of fats, carbohydrates and proteins. We investigated the
relationship between plasma free thyroxin and glucose, triglycerides, cholesterol, and total
plasma protein. The results of this study suggested that there were no significant correlation
between free thyroxin and glucose or lipid profile. However, a significant correlation between
plasma levels of free thyroxin and total protein has been described in Arbor Acres strain
(r = 0.42, p = 0.01).
We have also tried to provide reference ranges for blood biochemical parameters measured in
Isa 15 strain and Arbor Acres strain.
The obtained results will be useful for assessing the health of the animals, so that the genetic
potential of the bird is fully expressed. They will extend the current knowledge on changes in
blood biochemical profile in broilers."
