Abstract
The content of selenium in basic broiler diets was 50 ? 10, 100 ? 10, 150 ? 10 and 250 ? 10 ?gkg-1. At day 14, 28 and 42 tissue samples were collected. Dynamics and selenium deposits in blood, liver, muscle and heart were estimated in relation to the level of dietary selenium and age of broilers. When broilers were fed with diet containing 250 ?gkg-1 Se, at day 42 the highest concentration of Se was in liver (570.8 ? 44.1 ?gkg-1), blood (430.3 ? 46.5 ?gL-1) and heart (237.5 ? 42.8 ?gkg-1). At day 14, increase of dietary selenium content from 50 ?gkg-1 to 250 ?gkg-1 was followed by decrease of selenium deposits in heart: when broilers were fed with basic diet containing 50 ?gkg-1 Se measured content of Se in heart muscle was 49.8 ? 15.6 ?gkg-1 (99.6%) while in broilers fed with basic diet containing 250 ?gkg-1 Se measured content of Se in heart was 147.2 ? 33.4 ?gkg-1 (58.9%), respectively. The point of saturation as well as maximal concentration of selenium in liver was reached in period between fourth (556.7 ? 40.6 ?gkg-1) and sixth (570.8 ? 44.1 ?gkg-1) week of age. Also, feeding with basic diet containing 250 ?gkg-1 Se the selenium blood level reached 162.8 ? 28.9 ?gL-1 already at day 14 that represent 65.1% of dietary selenium.
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