EFFECTS INDUCED BY A SOURCE OF ORGANIC SELENIUM AND E VITAMIN USAGE IN DAIRY CATTLE FEEDING
I.M. Pop, Cristina Radu-Rusu, D. Simeanu, Cecilia Pop, N. Fleancu
The study aimed to establish the effects given by the feed supplementation of dairy cattle having Se deficiency, with a product containing organic selenium (selenite yeast) and E vitamin. Thus, two experimental groups have been set up (LC and LE), each of the comprising 10 BNR lactating cows. Besides LC group cows diet, every animal from LE group received, through daily ration, a dose of 4g Se and 500 I.U. of E vitamin, throughout a period of 8 months. Studied traits were represented by: selenium content in milk, blood serum, hair as well as the activity of gluthatione peroxidase, as an indicator of the antioxidative status. Analysis of acquired data at certain moments - 1, 2, 4, 7 and 8 months after study onset revealed that Se slowly and progressively accumulated into the body of animals belonging to LE group, compared to those in LM treatment. Since the Se supplementation has been arrested, the values for the studied microelement were double in blood serum and milk, comparing with those detected in control group (blood serum: 0.026 ppm Se in LE group vs. 0.013 ppm Se in LM group; milk: 0.018 ppm Se in LE group vs. 0.008 ppm Se in LM group). Glutathione peroxidase activity, as detected in blood samples, was higher in LE group, compared to the control one (10.075 µmol/ml vs. 4.069 µmol/ml, distinguished significant differences), revealing thus an increased antioxidative protection in the dairy cows whose diet was supplemented with organic Se and E vitamin.
Key words: dairy cows, feeding, organic selenium