Activity of protease inhibitors and lysozyme of hen's egg white depending on feed modification and egg storage
2005
Kopec, W., E-mail: [email protected] | Skiba, T. | Korzeniowska, M. | Bobak, L. | Trziszka, T. (Wroclaw Agricultural University (Poland). Dept. of Animal Products Technology)
The aim of the study was to recognise the effect of fodder modification with mineral-humine preparations, components rich in n-3 PUFA, and antioxidants (hibiscus, vit. A+E) on the activity of lysozyme, cysteine proteases inhibitor - cystatin and inhibitors of serine proteases in egg white. Hens' fodder supplementation with the studied additives lowered the activity of lysozyme, but not more than by 10 percent as compared to the control group. The activity of lysozyme was at the same level in all experimental groups fed with modified fodder. The enzymatic activity of lysozyme decreased slightly during storage of eggs. It can be concluded that fodder enrichment in n-3 PUFA changed the biological activity of egg white components. Only slight effect was observed upon the addition of humcarbovite and fish mineral concentrate, while the addition of KRM with vitamins A+E significantly decreased the activity of lysozyme and inhibitors in egg white. Feeding with rapeseed meal had a positive effect on cystatin activity but lowered the activity of other components, especially during storage
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