[The effect of increasing additions of low-esterified pectins in the diet on the metabolism of laying hens--tested by pair-feeding studies]

[Proposal for the introduction of an energy feed evaluation system based on unitary parameters and principles for all farm animals. 3. Energy feed evaluation for fowls]

The energy availability from the feedstuffs and the energy requirement of animals are characterized by the metabolizable energy. The metabolizable energy of the feed (feedstuff, ration) is interpreted as potential energy. For comparative analyses within and between animal species with regard to the energetic feed value of single feedstuffs the parameter "relative fat retention effect" is introduced. The metabolizable energy of a ration is estimated in consideration of live weight and protein production (protein in body gain and egg). The energy requirement is calculated factorial - as a rule by the partial utilization of metabolizable energy for partial performances (kf, kp, ko) in connection with the level and kind of partial performance; km is not used in the system. The proposed system of energetic feed evaluation is available as "computer variant" as well as "manual variant". The computer programme is fitted first of all to application in research and teaching. (The complete documentation of the proposal for energetic feed evaluation for fowls including a diskette for using of the computer programme for scientific application can be claimed in limited extend from the author.)