ORIGINAL PAPER
Effect of bee pollen and propolis (bee glue) on growth performance and biomarkers of heat stress in broiler chickens reared under high ambient temperature
1 |
University of Birjand, Depatment of Animal Science, Faculty of Agriculture, Birjand, Iran |
2 |
Young Researchers and Elites Club, Birjand Branch, Islamic Azad University, Birjand, Iran |
J. Anim. Feed Sci. 2016;25(1):45–51
Publication date: 2016-03-06
KEYWORDS
ABSTRACT
This study investigated the supplemental effects of bee pollen (BP)
and propolis (bee glue; BG) on broiler performance, intestinal morphometry,
haematological profile and biomarkers of heat stress in broilers reared under high
ambient temperature. Two hundred and forty one-day-old male broiler chickens
were divided into 4 treatment groups: control; BP – supplemented with 20 g
of BP · kg–1 of feed; BG – supplemented with 3 g of BG · kg–1 of feed; and BP + BG
– supplemented with 20 g of BP · kg–1 + 3 g of BG · kg–1. It was estimated that
dietary BP and BG improved average daily gain and average daily feed intake
of broilers particularly during the starter period (P < 0.05). The relative weights
of spleen and bursa of Fabricius were higher in groups fed supplemented diets
when compared to the control group (P < 0.05). Biomarkers of heat stress
including the circulating heterophil : lymphocyte ratio, creatine kinase level and
mRNA expression of 70 kD heat shock protein (HSP70) levels in breast muscle
were decreased in supplemented birds. In birds fed diets with BP and BG
addition, crypts were deeper and villus : crypt ratios were higher in the jejunum
segment (P < 0.05). The obtained results suggest that the dietary use of both
BP and BG as a feed additive may offer a practical nutritional strategy in high
temperature environment to prevail the harmful effects of heat stress in broiler.
CORRESPONDING AUTHOR
R. Nourmohammadi
Young Researchers and Elites Club, Birjand Branch, Islamic Azad University, Birjand, Iran
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