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Minerální výživa u nosnic
 Bielanová, Milena
Abstract The work summarizes the basic knowledge of physiological digestion and egg production and mineral nutrition of laying hens. It deals about need of minerals for the proper development of the poultry skeleton and for the production of quality eggs with a minimum number of non-quality eggs with a broken shell, or without the shell. Part is also devoted to disorders of the organism in case of improper supply of mineral substances. The last chapter deals with the analysis and assessment of 10 mixtures for pull-ets from the 17th week of age to 2 % of laying and 10 mixtures for laying hens up to 45 weeks of age. Of the tested mixtures, comparing the calcium and phosphorus content with the standard of nutrients need for the category, only one feed mixture was satisfactory for pullets from the 17th week of age, although had an 8 % lower nitrogen compounds content, and no one mixture from all the mixtures for layers to 45 week of laying corresponded to the nutrients need. The findings show that com-pound feed manufacturers should monitor the composition of the mixtures and the quality of the components more closely and check the mixed mixtures at the outlet before the sale to avoid unnecessary litigation between compound feed producers and egg producers.
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