The Effect of Propolis Extract on Internal Quality Parameters of Table Eggs
Keywords:
egg quality, egg weight, laying hens, propolis extractAbstract
The aim of our experiment was to evaluate the influence of propolis extract on internal egg quality parameters of laying hens’ hybrid Hy-Line Brown. For housing hens (n=40) three storey enriched battery cage was used in which hens were divided in groups (n=10). In the control group of hens complete feed mixtures without any additions were fed. In the first experimental group complete feed mixture was enriched with propolis extract in a dose of 0.1 g.kg-1. In the second experimental group propolis extract was added to the feed mixture at a dose of 0.25 g.kg-1. The third experimental group was enriched with propolis extract in a dose of 0.4 g.kg-1. All groups were fed ad libitum. Complete analysis of the table egg quality was used to evaluate quality parameters: egg weight (g), albumen weight (g), albumen index, Haugh Units (HU), yolk weight (g), yolk index, yolk colour (HLR). The results show that supplementation of feed mixture with propolis extract in a doses 0.25 g.kg-1 and 0.4 g.kg-1 significantly increased egg albumen index and Haugh Units (p£0.05) (values of Haugh Units of albumen in the order of the groups (mean±S.D): 79.87±7.23, 80.58±7.60, 82.11±8.36, and 81.66±9.16 HU). However, the addition of propolis extract in a same doses significantly decreased yolk weight (p£0.05). The values of the other eggs quality indicators were comparable with the control group (p>0.05).
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