Effects of Soybean Small Peptides on Nitrogen Equilibrium, Nutrient Digestibility and Levels of Glucose, Ammonia and Amino Acids in the Portal Veinous Plasma of Goats

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To study the effects of soybean small peptides and their methods of supply on nitrogen balance, digestibility of nutrients and concentrations of glucose, ammonia and amino acids in the portal veinous plasma of goats, eight Xiangdong black goats were used in a 4×4 Latin square test design. Goats were divided at random into four groups (two goats in each group). Each group received the following four treatments in a different order over four treatment periods: the SSPF treatment (soybean small peptides in the basic diet by feeding), the FAAF treatment (free amino acids in the basic diet by feeding), the SSPI treatment (soybean small peptides by infusing through the duodenum fistula), or the FAAI treatment (free amino acids by infusing through the duodenum fistula). The results showed that nitrogen retention in the goats with the SSPI and SSPF treatments were much better than in those that received the FAAF (P<0.01) and FAAI treatments (P<0.05), and the FAAI treatment was also better than the FAAF treatment (P<0.05). The apparent protein digestibility in the goats with the SSPI treatment was significantly higher than in those that received the FAAF (P<0.01) and FAAI treatments (P<0.05), and apparent protein digestibility in the goats treated with SSPF and FAAI was also significantly higher (P<0.05) than in those treated with FAAF, respectively. Moreover, the apparent biological value of protein in the goats treated with SSPI was higher by 48.71% (p<0.01), 32.71% (p<0.05) and 20.98% (p<0.05) than in those treated with FAAF, FAAI and SSPF, respectively, and the apparent biological value in the goats with the SSPF treatment was significantly higher (p<0.05) than in those that received the FAAF treatment. Regarding the digestibility of dietary nutrients, there were no significant differences in crude fat digestibility among the different treatments. However, metabolizable energy digestibility in the goats treated with SSPI was higher by 14.59% (P<0.05), 10.10% (P>0.05) and 3.40% (P>0.05) than in those treated with FAAF, FAAI and SSPF, respectively. But, metabolizable energy digestibility in the goats treated with FAAF was significantly lower (P<0.05) than in those that received the SSPF treatment. The digestibility of total amino acids in the goats treated with SSPI, FAAI, SSPF and FAAF were 78.74%, 69.55%, 73.88% and 64.69%, respectively. By contrast, dietary crude fiber digestibility in the goats receiving the SSPF and FAAF treatments was higher than in those that treated with SSPI or FAAI. The glucose levels in the portal veinous plasma in the goats receiving the SSPI and FAAI treatments were significantly higher (P<0.05) than in those receiving SSPF and FAAF treatments. Ammonia levels in the portal veinous plasma of the goats treated with SSPF and FAAF were significantly higher (P<0.05) than in those treated with SSPI and FAAI. The amino acid level in the portal veinous plasma of the goats treated with SSPI was significantly higher than in those treated with FAAF (P<0.01), FAAI (P<0.05) and SSPF (P<0.05), and both the SSPF and FAAI treatments were better (P<0.05) than the FAAF treatment. Our results suggest that soybean small peptides are more effective than free amino acids in promoting nitrogen balance and protein biological value, and increasing digestibility of dietary nutrients and levels of glucose and amino acids in the portal veinous plasma of goats. The method of supplying soybean small peptides or free amino acids by infusing through the duodenum fistula was more advantageous than that by feeding.
鹿児島大学の論文
2005-02-20

Effects of Soybean Small Peptides on Nitrogen Equilibrium, Nutrient Digestibility and Levels of Glucose, Ammonia and Amino Acids in the Portal Veinous Plasma of Goats

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