In vivo digestibility of kleingrass from fecal nitrogen excretion
Keywordsorganic matter digestibility
in vitro digestibility
MetadataShow full item record
CitationFerri, C. M., Stritzler, N. P., Brizuela, M. A., & Petruzzi, H. J. (2003). In vivo digestibility of kleingrass from fecal nitrogen excretion. Journal of Range Management, 56(1), 52-55.
PublisherSociety for Range Management
JournalJournal of Range Management
AbstractIt was proposed that the digestibility of organic matter (OMD) can be estimated from the relationship between total fecal nitrogen (TFN, as a % of organic matter intake (OMI) and fecal nitrogen concentration (FNc) through the equation: OMD = 1 - TFN/FNc. Two assumptions are critical to this equation, total fecal nitrogen (as a % of OMI) is a constant and does not change within a range of diet crude protein and fecal nitrogen concentration is proportional to digestibility of organic matter. The objective of this study was to test if total fecal nitrogen (as a % if OMI) remains constant over 3 feeding levels, and if fecal nitrogen concentration decreases with decreasing organic matter digestibility of maturing forages. Total fecal nitrogen did not change (P = 0.94) with feeding level, but increased (P < 0.05) with evaluation period. The fecal nitrogen concentration correlated (r = 0.60, P < 0.001) to digestibility of organic matter. The results show that digestibility of organic matter cannot be estimated from total fecal nitrogen, unless time of year is considered.