Effects of dietary n-3 polyunsaturated fatty acids and ... - FINS

Starch disappearance (%)1 st WorkshopXIII International Feed Technology SymposiumSimilarly in pigs and poultry is the evaluation of feeds quality on the basis of crudeprotein content insufficient already. The assessment of the basis of chemicallydetermined crude protein did not take into account losses, which arise during digestionand utilization of feed in organism of animals [11]. Also for this reason it was necessaryto broaden disproportionately the so-called security limits, by which the potential risksof deficiency could be eliminated, when defining standards of needs of total amino acids.These limits are mostly empirical, non-specific and can consequently cause noneffectiveutilization of nutrients. Expression of amino acid needs in biologicallyutilizable form is more accurate than data on need of total amino acids (table 1).Assessment and use of data on really digested amino acids, which have biological basisin difference to existing chemical-analytical data, enable to formulate and cover the needand to use more effectively the potential of feed at the same time.Crude protein as well as saccharide component of feeds differs by its quality, which isconnected with their chemical and physical structure and primary composition. Itbecomes evident by their consumption by animals, speed and range of degradation inrumen of ruminats; effectiveness of energy and crude protein utilization from feedsdepends on it. Concentrates and roughage differ markedly in extent and speed of crudeprotein and saccharide component degradation (graph 1, 2).Variability in speed of saccharides degradation influences the course of fermentation,causes changes in cellulolytic and amylolytic activity of rumen microflora and in theplace of digestion, and in this way also utilization of nutrients by animal.100806040200 2 3 4 6 9 16 24 48Incubation time (h)rye barley oat maize w heatGraph 1. Saccharide component degradation in tested feeds69