Abstract
1. Effects of dietary fat source and supplemental lysophosphatidylcholine on performance, immune responses, and ileal nutrient digestibility in broilers fed corn/soybean meal- or corn/wheat/soybean meal-based diets S. Allahyari-Bake, R. Jahanian Poultry Science CrossRef
Highlights
The successful utilization of microbial enzymes in poultry rations depends upon an understanding of their modes of action and the role they are to perform
Under practical conditions these enzymes are most effective in the first weeks of life of chickens, with little or no effects seen in adult birds (Brenes et al, 1993) because adult birds digest diets rich in viscous non-starch polysaccharides (NSP) better than young ones (Smulikowska, 1995)
Under experimental (Tables 3 and 4) and practical (Table 5) conditions, supplementation of broiler chicken diets containing cereals rich in soluble viscous NSP with feed enzymes lowers digesta viscosity and increases digestion and absorption of nutrients, which improves the performance of the birds
Summary
The successful utilization of microbial enzymes in poultry rations depends upon an understanding of their modes of action and the role they are to perform. The most effective enzymes used to improve the nutritional value of cereals containing highly viscous non-starch polysaccharides (NSP) are those with pentosanase and The beneficial action of these enzymes has been associated with freeing nutrients masked by insoluble cell wall material (Hesselman and Aman, 1986) and with reducing digesta viscosity (Bedford and Classen, 1992). Under practical conditions these enzymes are most effective in the first weeks of life of chickens, with little or no effects seen in adult birds (Brenes et al, 1993) because adult birds digest diets rich in viscous NSPs better than young ones (Smulikowska, 1995)
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