Selen je esencijalni mikroelement potreban svim životinjama za rast, zdravlje i održavanje normalnih biokemijskih funkcija. Deficit selena u ptica, osobito uz istovremeni nedostatak vitamina E, uzrokuje pojavu eksudativne dijateze, encefalomalaciju i atrofiju pankreasa, a utvrđen je i pad otpornosti, smanjenje proizvodnje jaja, te porast embrionalne smrtnosti. Istraživanje je provedeno na fazanskim pilićima (n=24) koji su prvih 28 dana hranjeni standardnom krmnom smjesom s 28% sirovih bjelančevina. Nakon toga pilići su podijeljeni u dvije skupine i do 70. dana starosti hranjeni krmnom smjesom s 24% sirovih bjelančevina ("Valpovka" Valpovo). Pokusnoj je skupini umiješan pripravak organskog selena (200 g/tonu, Sel-Plex®, Alltech, inc.). Tjelesne mase pilića kontrolne skupine bile su veće za 5,98% 56. dana, a 14,15% 70. dana tova. Biokemijskom pretragom seruma fazanskih pilića 70. dana pokusa utvrđena je statistički značajno (P<0,01) niža razina kreatinina, niža razina (P<0,05) triglicerida, ukupnog kolesterola i LDL-kolesterola u pokusnoj skupini, dok je koncentracija ukupnih bjelančevina i albumina bila viša. Hematološkom pretragom utvrđen je statistički značajno veći (P<0,05) udio štapićastih heterofila u pokusnih životinja. Jednostavnom raščlambom trupova nakon klanja utvrđena je značajno (P<0,05) manja masa kože i iznutrica (P<0,01) u pokusnoj skupini, dok je udio vrijednih dijelova trupova bio ujednačen.Selenium is the essential trace element incorporated intob the diets of all animals.lt is important for the maintenance of health, growth and normal biochemical parameters. Selenium deficiency in birds can manifest exudative diathesis, encephalomalation, pancreatic atrophy, immune deficiencies, decrease of egg production and increase of embrionic mortality. The investigation included 24 pheasant chickens divided into two groups fed standard feed mixture for pheasant chickens (starter mixture with 28% of crude proteins and grower mixture with 24% of crude proteins). In the experimental group Sel-Plex® was added in the concentration of 0.2%. Body weight in the control group was higher by 5.98% on day 56 of the trial and 14.15% higher on day 70 of the trial as compared to the experimental group. Biochemical investigation on day 70 of the trial showed sig¬nificantly lower concentration (P<O.Ol) of creatinine, tryglicerol (P<0.05), total cholesterol as well as LDL-cholesterol in the exper¬imental group. Higher concentration of total protein and albumin was established in the experimental group compared to the controls. The level of heterophyl (band) leucocites was significantly (P<0.05) higher in the experimental group. After slaughter significantly lower (P<0.05) skin weight and lower offal weight were determined in the experimental group but highly valuable parts of carcasses were equal in both groups
