الفهرس 
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Abstract
An on-farm experiment was carried out to study the effect of
dietary organic chromium supplementation on growth
performance, carcass parameters, some blood plasma parameters
and economical efficiency of broilers raised in an open house
under Egyptian summer conditions.
A total of 320 unsexed day-old broiler chicks were randomly
assigned in 10 equal groups of 4 equal replicates each. Two
experimental corn-soybean meal basal control diets were
formulated being 22% CP & 3050 kcal ME/kg for the startergrower diet and 18.5% CP & 3200 kcal ME/kg for the finisher
diet. During each specific feeding phase, the basal control diet
was supplemented with Cr-methionine chelate, Cr-picolinate or
Cr-yeast at levels of 400, 800 and 1200 μg Cr/kg diet. Therefore,
ten experimental dietary treatments were studied in this study.
Live growth performance, carcass traits, edible giblets, lymphoid
organs, some blood plasma parameters and economical
efficiency were determined
The main results showed that Cr addition to broiler diets
significantly increased body weight, growth rate, performance
index and improved feed conversion and economical efficiency.
The Cr addition significantly decreased abdominal fat, plasma
triglycerides and glucose. However, Thyroid hormones as well
as alanine aminotransferase and aspartate aminotransferase were
not affected by dietary Cr addition. In conclusion, it is advisable
to use Cr-Pico at a level of 800 μg Cr/kg diet in broiler diets.
Such practice helps in decreasing the financial pressure on the
farmer and seems to be advantageous in improving the
economical profitability and reducing the negative effects of heat
stress on body weight, body weight gain, feed intake, feed
conversion and some plasma metabolites of broiler chicks reared
under Egyptian summer conditions.
Keywords: (Organic chromium, methionine, picolinate, yeast,
heat stress, growth, performance, economic,
carcass, blood plasma and broilers).