Sampling procedures and calculation of intakes
Six days after the introduction of labelled-SFM supplement, faecal output by the crate sheep was estimated
by total collection over a further 6 days. Rectal grab-samples of faeces were also obtained from these
sheep at 0900 and 1600h on each day of the collection period. Pen sheep were grab-sampled over this same
period, but only in the mornings. Faecal output in all sheep was also estimated using C36 alkane (from the
alkane CRD) as an external marker.