Einfluß einer Proteinrestriktion und -realimentation auf die N-Bilanz von Ferkeln

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Abstract
In balance trials the effect of a 50% protein restriction with subsequent realimentation on N balance, endogenous N excretion, digestible and metabolizable energy was tested using 36 piglets. The dietary protein cointent during the restriction period from 5-12 kg live weight was 22.9 (control) and 12.4% of the dry matter and during the realimentation period from 12-18 kg live weight in both groups 17.2%. Protein quality and energy supply were not changed between the groups. Restricted protein supply proportionally reduced N retention with slightly improved efficiency of digestible N from 67-70%. During realimentation the previously reduced N supply did not influence N retention but increased the apparent N digestibility by 2%. The endogenous N losses as well as digestible and metabolizable energy were not different between the groups. Compensatory responses of the N metabolism might require a stronger dietary restriction and/or a longer restriction period.