Exocrine pancreatic secretions in growing pigs fed diets containing different levels of protein from soyabean meal

Abstract

Six barrows, average initial BW 20.2 + 0.9 kg, were fitted with a pancreatic pouch re-entrant cannula. Following a 14-d recuperation period, the pigs were fed two diets according to a crossover design, twice daily. Two maize starch-based diets were formulated to contain 12 and 24% CP from soyabean meal. The experiment consisted of 2 periods of 12 d each. The average BW at the start of periods 1 and 2 were 24.0+ 1.1 and 31.3 + 2.6 kg, respectively. The average BW at the conclusion of the experiment was 40.2 +1.6 kg. The daily volume of secretion was slightly higher (P < 0.05) in pigs fed the low compared with the high protein diet. There were no differences (P>0.05) in total protein output in pancreatic juice although the protein concentration (g/1" 1) was higher (P<0.05) in pigs fed the high protein diet. There was no effect (P>0.05) of dietary CP level of the total activities (units 24 h" 1) of chymotrypsin, trypsin, amylase and lipase. The specific activities (units f') of chymotrypsin and amylase were higher (P < 0.05) when the high protein diet was fed. An increase in BW augmented (P<0.05) the secretion of volume of pancreatic juice, protein output and total activities of chymotrypsin and lipase. In conclusion, there were no differences in total protein output and total enzyme activities in pancreatic juice when the dietary CP content ranges from 12 to 24%.

Flow of endogenous and exogenous nitrogen in different segments of the small intestine in pigs fed diets with soyabean concentrate, soyabean meal or rapeseed cake

“…It seems, as far as pancreatic protein secretion is concerned, the different dietary N contents did not affect the amount of secreted endogenous N in pigs. These findings are in agreement with the data of Li et al (1997).…”