Quality of meat and selenium content in tissues of rabbits fed diets supplemented with sodium selenite, selenized yeast and selenized algae

Abstract

40 králíků odstavených ve věku 35 dní byli náhodně přiřazeno do 4 skupin po 10 kusech. Králíci byli krmeni základní granulovanou potravou obsahující 0,08 mg Se/kg, nebo krmivem obsahujícím seleničitan sodný, nebo droždí s obsahem selenu, nebo řasy s obsahem selenu - obsah Se v těchto krmivech byl 0,4 mg/kg. Po 6 týdnech byly králíci poraženi a byla provedena analýza jejich masa, jater a srsti. Z výsledů vyplývá, že (i) hlavní výhodou doplnění králičího krmiva selenem je následné obohacení masa králíků a (ii) že droždí a řasy s obsahem selenu jsou účinnější než seleničitan.

Forty rabbits weaned at 35 d of age were randomly assigned to 4 groups of 10 rabbits each. The rabbits were fed a basal granulated diet containing 0.08 mg Se/kg, or diets obtained from basal diet, supplemented with sodium selenite, selenized yeast (Se-yeast) or selenized algae Chlorella (Se-algae) to increase the Se concentration to 0.40 mg/kg. After 6 weeks rabbits were slaughtered at 77 d of age. Samples of meat, liver and hair were analyzed. The Se supplements did not influence rabbit growth, feed intake and weight loss during cooling. The nutrient composition of meat (dry matter, protein and fat concentration) was only marginally influenced. The Se concentration in the loin and hindleg meat increased by 23.0% and 19.2%, respectively in rabbits receiving the selenite supplement. In rabbits fed Se-yeast and Se-algae, the Se content in meat doubled from 0.11-0.15 mg/kg to 0.24-0.29 mg/kg. High Se concentrations (=1 mg/kg) were observed in hair and liver of rabbits which had received the Se-supplements. In all supplemented groups, the activity of glutathione peroxidase in the loin meat was higher than in control rabbits by 51.9-72.8% (P