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The diurnal pattern of ileal dry matter and endogenous ileal nitrogen flows in the growing pig
- Hodgkinson, Suzanne M., Moughan, Paul J., Morel, Patrick C.H., Reynolds, Gordon W.
- Journal of the science of food and agriculture 2002 v.82 no.15 pp. 1860-1866
- body weight, cannulas, casein, centrifugation, chromic oxide, chromium, diet, digesta, digestive tract, diurnal variation, ileum, molecular weight, nitrogen, swine, swine feeding, ultrafiltration
- The aim was to examine the diurnal pattern of endogenous nitrogen flow at the terminal ileum of the pig. Seven entire male pigs with a mean body weight of 58 kg had post-valve T-caecum (PVTC) cannulae surgically implanted for the collection of ileal digesta. The pigs were fed equal-sized meals (10% of metabolic body weight, W0.75, per day) twice daily at 08:00 and 17:00. The semi-synthetic diet included enzyme-hydrolysed casein (<5000 Da, 100 g kg−1 diet) as the sole source of nitrogen (N). The diet also contained chromic oxide (6 g kg−1) as an indigestible marker. The pigs received the diet for an 8 day period, and digesta were continuously collected for 24 h periods (commencing at 08:00) on the fifth and eighth days. Digesta were analysed for dry matter (DM) and chromium (Cr), and endogenous N was determined in the precipitate + retentate fraction of the digesta following centrifugation and ultrafiltration (10 000 Da molecular weight cut-off). The concentration of Cr expressed on a digesta DM basis and the ratio of endogenous N to Cr in the digesta were relatively constant over the 24 h digesta collection periods, with no statistically significant (P > 0.05) differences found for the latter measure in the digesta collected between 12:00 and 08:00. The endogenous N flow through the terminal ileum is the net effect of the secretion and reabsorption of endogenous N that occurs throughout the digestive tract. The net result of the latter two processes in the small intestine of the pig leads to a relatively constant endogenous N flow over time post-feeding.