Methodical investigations on the use of n-alkanes as markers for estimation of feed intake of cattle [German]

摘要

In order to measure the recovery rate of n-alkane markers, balance trials with 4 rumen fistulated non lactating Holstein-Friesian cows were carried out. The cows were fed 7 kg gras hay as the only feed and treated for 18 days with 1.200 g of n-dotriacontane (C-32) as an external marker per day. After including the marker in gelatine capsules, it was administered into the rumen via fistula. During the last 7 or 8 days faeces were collected and subsembled. Apart from the external marker (C-32), n-tritriacontane (C-33) was used as internal marker, which is known to be naturally present in gras hay. The determination of both markers in gras hay and faeces was carried out applying a gaschromatography procedure.