2. Materials and methods
2.1. Animals and experimental design
The experiment (Table 1) comprised four trials with two
experimental pen replicates of each of the four treatments:
Treatment A (conventionally reared Danish pigs fed 100%
concentrate according to Danish recommendations (without
roughage and outdoor area)) was compared with three
different organic pig production systems with access to outdoor
area, where the pigs were fed either Treatment B
(100% organic concentrate according to Danish recommendations
(without roughage)), C (70% organic concentrate
according to Danish recommendations (restrictedly) plus
ad libitum organic barley/pea silage) or D (70% organic
concentrate according to Danish recommendations
(restrictedly) plus organic ad libitum clover grass silage,
where the relative levels of concentrate feeding refer to an