INFLUENCE OF SELENIUM CONTENT AND OIL SOURCES IN FEED ON CONCENTRATION OF THYROID GLAND HORMONES AND ELECTROLYTE IN BROILER BLOOD

• Main Authors: Zlata Kralik, Gordana Kralik, Marcela Šperanda
• Format: Article
• Language: English
• Published: Faculty of Agrobitechnical Sciences Osijek 2014-12-01
• Series: Poljoprivreda
• Subjects: selenium and oil; broilers; thyroxine; triiodothyronine; blood electrolytes
• Online Access: http://161.53.194.251/~poljo/upload/publications/poljoprivreda-20-2-8.pdf

The research aimed to elaborate the influence of designed mixtures used in broilers fattening on the concentration of electrolytes and thyroid gland hormones in the blood.. The research was carried out on 120 male Ross 308 hybrid broilers. The fattening lasted for 42 days. During the first three weeks of fattening broilers were fed standard starter diet containing 22% crude protein and 13.90 MJ/kg ME. During the last three weeks of fattening, broilers were divided into 6 experimental groups, each fed specially prepared finisher diets (P1=6% sunflower oil+0.0 mg Se/kg of feed, P2=6% linseed oil+0.0 mg Se/kg of feed, P3=6% sunflower oil+0.3 mg Se/kg of feed, P4=6% linseed oil+0.3 mg Se/kg of feed, P5=6% sunflower oil+0.5 mg Se/kg of feed, P6=6% linseed oil+0.5 mg Se/kg of feed). Finisher diet was balanced at 18.02% crude protein and 14.40 MJ/kg ME. It was found out that the type of oil in chicken feed influenced to blood pH (P <0.001), whereas selenium level (P=0.014) in the feed, as well as the oil type and selenium level interaction (P<0.001) influenced the concentration of potassium in the blood. Oil type (P=0.037) influenced the concentration of fT3, which was lower in chickens fed mixtures with addition of linseed oil than in the chickens fed sunflower oil added mixtures. Interaction of selenium content and oil type had influence on differences in concentration of fT4 as well as on the ratio of fT3/fT4, (P<0.001, i.e. P=0.021). The research results indicated that oils supplemented to broiler diets and combined with different organic selenium concentrations affected pH, concentration of some electrolytes and thyroid gland hormones in broiler blood, however, all obtained values were within reference range for poultry.